#ZooKeys ZooKeys 1233: 245-288 (2025) DOI: 10.3897/zookeys.1233.120598 Research Article Survey of the Notonectidae (Insecta, Hemiptera, Heteroptera, Nepomorpha) from northeastern Brazil Rafael Jordao™, Julianna Freires Barbosa”®, Felipe Ferraz Figueiredo Moreira'® 1 Laboratorio de Biodiversidade Entomologica, Instituto Oswaldo Cruz, Fundagao Oswaldo Cruz, Rio de Janeiro, Brazil 2 Laboratério de Entomologia, Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil Corresponding author: Rafael Jordao (rjordao2006@gmail.com) OPEN ro} ACCESS Academic editor: Jader Oliveira Received: 9 February 2024 Accepted: 1 April 2024 Published: 1 April 2025 ZooBank: https://zoobank.org/ E95BDD/0-FOF2-429D-9981- SOAASC47BBEA Citation: Jordao R, Barbosa JF, Moreira FFF (2025) Survey of the Notonectidae (Insecta, Hemiptera, Heteroptera, Nepomorpha) from northeastern Brazil. ZooKeys 1233: 245-288. https://doi.org/10.3897/ zookeys.1233.120598 Copyright: © Rafael Jordao et al. This is an open access article distributed under terms of the Creative Commons Attribution License (Attribution 4.0 International - CC BY 4.0). Abstract A four-year survey for Notonectidae (Insecta: Hemiptera: Heteroptera: Nepomorpha) was conducted in eleven conservation units and adjacent areas distributed over six states in northeastern Brazil. Nearly 1400 specimens of the following 18 species, four genera, and two subfamilies have been collected: Buenoa amnigenus (White, 1879), B. femoralis (Fieber, 1851), B. fuscipennis (Berg, 1879), B. koina Nieser & Pelli, 1994, B. konta Nieser & Pelli, 1994, B. mutabilis Truxal, 1953, B. pallipes (Fabricius, 1803), B. platyenemis (Fie- ber, 1851), B. pseudomutabilis Barbosa, Ribeiro & Nessimian, 2010, B. salutis Kirkaldy, 1904, B. tarsalis Truxal, 1953, B. unguis Truxal, 1953 (Anisopinae); Enitharoides brasilien- sis (Spinola, 1837), E. tricomerus Barbosa, Ribeiro & Nessimian, 2017, Martarega bentoi Truxal, 1949, M. brasiliensis Truxal, 1949, M. membranacea White, 1879, and Notonecta disturbata Hungerford, 1926 (Notonectinae). Altogether, they represent 30 new records from the states of Alagoas, Bahia, Ceara, Pernambuco, Piaui, and Sergipe, and seven new records from northeastern Brazil, increasing the number of species recorded from the region from 11 to 18. A key to these species is provided, as well as illustrations, diagnoses, taxonomic notes, and a summary of their known geographic distributions. Key words: Aquatic insects, Atlantic Forest, backswimmers, biodiversity, Caatinga Introduction Notonectidae (Insecta: Hemiptera: Heteroptera: Nepomorpha) is a cosmo- politan family and second in richness only to Corixidae sensu lato among the aquatic bugs, with approximately 400 species and 11 genera (Polhemus and Polhemus 2008). Commonly known as backswimmers, because of the remark- able upside-down swimming method of all species in the family, they exhibit fusiform body up to 15 mm in length (Schuh and Slater 1995). They can be found in lotic and lentic habitats, like slow streams, artificial and natural ponds, and even small mud puddles, feeding on aquatic organisms such as mosquito larvae, crustaceans, and fish larvae (Papacek 2000). Notonectids go through four or five nymphal stages during their development and show wing polymor- phism in some genera (Hungerford 1933). The family is currently divided in two subfamilies, Anisopinae and Notonectinae, both of which are present in Brazil. 245 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil The former is represented in the country by 31 species of the genus Buenoa Kirkaldy, 1904, and the latter by Enitharoides Brooks, 1953 (four species), No- tonecta Fabricius, 1758 (eight species), and Martarega White, 1879 (fourteen species) (Moreira et al. 2011; Ribeiro et al. 2022). Most of the data concerning backswimmers from Brazil are based on mate- rial collected in its southeastern portion (Moreira et al. 2011), with some recent advances in the northern, northeastern, and central-western regions (e.g., Bar- bosa et al. 2010a, b, 2012; Barbosa and Nessimian 2013a, b; Barbosa and Giehl 2014; Moreira et al. 2016; Takiya et al. 2016; Barbosa and Dias-Silva 2017). The Caatinga biome spreads through nearly 11% of the Brazilian territory, contained within nine states of the northeastern region and a small portion of northern Minas Gerais state (southeastern region). Surrounded by the Amazon, Cerrado, and Atlantic Forest biomes, it is a semiarid and dynamic environment. The biodiversity of the Caatinga currently faces two large threats, namely the deforestation caused by cattle herding and climate change, both of which can interfere with the already erratic local rainfall regime and lead to a desert- ification process (Castelletti et al. 2004; Oyama and Nobre 2004). Moreover, recent observations indicate that conservation units in Brazil fail to effectively safeguard aquatic insects, as the protection they afford is comparable to that of randomly chosen areas. A primary contributing factor to this inefficiency is the haphazard selection of sites for development, often motivated by economic considerations or anecdotal evidence (Dias-Silva et al. 2021). Considering this scenario, we present here the partial results of a survey of the Nepomorpha from northeastern Brazil, focusing on the family Notonectidae and mainly on the Caatinga biome, but also including adjacent areas of Atlantic Forest. Materials and methods Specimens collected in Alagoas (AL) and Sergipe (SE) states were obtained in 2018 and 2019 as part of the project “Diversity and distribution of water bugs (Insecta: Heteroptera: Gerromorpha and Nepomorpha) of Alagoas and Sergipe, northeastern Brazil”. Specimens collected in Bahia (BA), Ceara (CE), Pernam- buco, (PE), and Piaui (Pl) states are results of the project “Diversity and con- servation of Hemiptera (Insecta) from the Caatinga”, carried out from 2018 to 2021. The following eleven federal conservation units have been studied (Figs 11-20): Area de Protecdéo Ambiental da Costa dos Corais (APACC, AL), Area de Protecado Ambiental de Piagabucu (APAP, AL), Estacao Ecolédgica de Mu- rici (EEM, AL), Reserva Extrativista Marinha da Lagoa do Jequia (RESEX, AL), Reserva Biolégica de Pedra Talhada (RBPT, AL/PE), Parque Nacional da Cha- pada Diamantina (PNCD, BA), Estacdo Ecoldgica de Aiuaba (EEA, CE), Parque Nacional do Catimbau (PNCA, PE), Parque Nacional da Serra das Confusdes (PNSC, PI), Parque Nacional da Serra de Itabaiana (PNSI, SE), and Reserva Bi- oldgica de Santa Isabel (RBSI, SE). Brazilian states are abbreviated as follows: Acre (AC); Alagoas (AL); Amapa (AP); Amazonas (AM); Bahia (BA); Ceara (CE); Distrito Federal (DF); Espirito Santo (ES); Goids (GO); Maranhado (MA); Mato Grosso (MT); Mato Grosso do Sul (MS); Minas Gerais (MG); Para (PA); Paraiba (PB); Parana (PR); Pernambuco (PE); Piaui (PI); Rio de Janeiro (RJ); Rio Grande do Norte (RN); Rio Grande do Sul (RS); Rond6énia (RO); Roraima (RR); Santa Ca- tarina (SC); Sdo Paulo (SP); Sergipe (SE); Tocantins (TO). ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 246 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil The collecting methods employed were light traps (white sheet) and active sampling with sieves and aquatic nets in water bodies like swamps, puddles, streams, lakes, and small rivers. Specimen identification was based mostly on Truxal (1953), Barbosa and Nessimian (2013a, b), and Barbosa et al. (2017). Images of the specimens were acquired with a Leica M205C stereomicroscope at different focal distances and stacked using LAS CORE v. 4.6. Image enhance- ments were made using Adobe Photoshop CC 2015. Drawings and photo- graphs were made based on male specimens. Material examined is deposited in the Colegao Entomoldgica do Instituto Oswaldo Cruz, Rio de Janeiro, Brazil (CEIOC), and in the Colecdo Zooldgica do Maranhao, Caxias, Brazil (CZMA). In the distribution section of each species, all references that we are aware of are provided for the records from Brazilian states. For other countries or territories, only the first known record is provided. New state records are preceded by an ex- clamation mark “!” in the lists of material examined. Distribution maps were made with QGIS v. 3.16.3 (QGIS 2022). Truxal (1953) recorded Buenoa antigone antigone (Kirkaldy, 1899) from northeastern Brazil based on female specimens only, which is questionable. Because this is the only record of this species from the study area and it is absent from our samples, we decided to not include it in our results. Results Key to males of Notonectidae species found in northeastern Brazil 1 Labrum triangular (Fig. 1C, D); hemelytral commissure without hair-lined PECPIC) EA) car son 2 x wt Retr case Men cee Sac Ae [Notonectinae] 2 - Labrum rounded (Fig. 1E); hemelytral commissure with hair-lined pit 3. Anterolateral margins of pronotum straight, without foveae (Fig. 2D); male parameres symmetrical... Notonecta disturbata Hungerford, 1926 (Fig. 10M) - Anterolateral margins of pronotum foveate (Fig. 2A); male parameres AS VIMIMVE DMCA Reve scsesaiinrnascanenbestenacsteasaresutentasaxniee cosssecanenstntosateben tees [Enitharoides] 4 4 — Scutellum with wide, subrectangular, punctate area medially (Fig. 2B); mid- dle femur with short pubescence and poorly developed anteapical protuber- ance (Fig. 2C)..........066 Enitharoides brasiliensis (Spinola, 1837) (Fig. 10N) - Scutellum with widely distributed, deeply punctate area (Fig. 2E); middle fe- mur with long pubescence and robust anteapical protuberance (Fig. 2F) .... bewak Enitharoides tricomerus Barbosa, Ribeiro & Nessimian, 2017 (Fig. 100) 5 Ocular commissure < 1/2 of eye width (Fig. 6A); ventral surface of middle trochanter with a small group of ensiform bristles centrally (Fig. 3A) ........ AIM pee ANA Ars ARENT Martarega bentoi Truxal, 1949 (Fig. 10P Q) - Ocular commissure 1/2 of eye width or more; ventral surface of middle trochanter witha Patch OFTAUV SOLACE, beooss5 ac, canciones oneretchanditee a weaves 6 6 Ocular commissure half of eye width; third labial article pubescent; scutellum with hyaline apex (Fig. 3B)....... Martarega brasiliensis Truxal, 1949 (Fig. 10R) - Ocular commissure more than half of eye width; third labial article gla- brous; scutellum with posterior half of its length hyaline (Fig. 3C).............. Ree, ho ed rect Martarega membranacea White, 1879 (Fig. 10S) ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 247 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil 10 17 15 16 Ae, Synthlipsis wide, half of anterior width of vertex or slightly less (Fig. 6B)...8 Synthlipsis narrow, less than half of anterior width of vertex.................. 12 Labial prong longer than third labial article (Fig. 6C).............ccccccceceeeees 9 Labial prong equal to or shorter than third labial article............0.......08 11 Apex of fore femur narrowed (length > 3x the width at apex, Fig. 6D); mid- dle tarsus with first article deeply emarginated (Fig. 4A)............ccccccceeees Frenette. erent tence enchant es Buenoa tarsalis Truxal, 1953 (Fig. 10K) Apex of fore femur slightly widened (length < 3x width at apex); middle tarsus without: such imodcinGatons+.:2-.27S ic. mctres Woe ceevauseees, Wass teen de eres oe 10 Large species (7.8-8.6 mm); labial prong slightly longer than third labial arti- cle, nearly straight (Fig. 7A)........... Buenoa femoralis (Fieber, 1851) (Fig. 10B) Medium-sized species (5.5—6.2 mm); labial prong much longer than third labial article, arc-shaped (Fig. 6C).........cccccccccsscsseseesecssessesecsscseesesseeseeseeaes bce seattuleernoaskties sesEciie occa ace Buenoa pallipes (Fabricius, 1803) (Fig. 10G) Labial prong subequal to slightly longer than third labial article length; fore trochanter without conspicuous process pointing backwards; fore femur widened at apex; middle tibia not widened at APEX ............ ec eceeseceeeerteeeeeees eR Se Pe ERE ALI eh RL Buenoa koina Nieser & Pelli, 1994 (Fig. 10D) Labial prong distinctly shorter than third labial article (Fig. 7D); fore tro- chanter with a conspicuous process pointing backwards (Fig. 4B); fore femur not widened at apex; middle tibia widened at apex ..............ccceeeeee ee Medan pon ACoA ree ee at Buenoa fuscipennis (Berg, 1879) (Fig. 10C) Fore femur with stridulatory area (Fig. 6D, small arrow) ..............ccceee 13 Fore femur without’ stndulatomny area. tect messes vase eeserecten es eee ecient 15 Labial prong originating distally on third labial article; apex of fore femur WIdENED........eeceececeteeseceteeees Buenoa platycnemis (Fieber, 1851) (Fig. 10H) Labial prong originating proximally or medially on third labial article; apex Ol OPEtTeInk NAMOW CO .2 Yee cavwees. dieses honed ab teAber ens anenteones 14 Tylus pubescent; stridulatory area of foretibia with 21-25 teeth; abdomi- nal ventral laterotergite | with a dark nodule (Fig. 5B) ............ccccceeeeseeeeeee Buenoa pseudomutabilis Barbosa, Ribeiro & Nessimian, 2010 (Fig. 101) Tylus glabrous; stridulatory area of foretibia with 33-38 teeth; abdominal ventral laterotergite | without dark NOdUIE...............eeeccceesseecesssecesesseeeeesnees Las ecdtanie natnbee cera eaeaRe recente oe Buenoa mutabilis Truxal, 1953 (Fig. 10F) Tylus flat; labial prong shorter than third labial article; fore tarsus with claws orthogonal-angulated (Fig. 5A)......... Buenoa unguis Truxal, 1953 (Fig. 10L) Tylus rounded; labial prong subequal to or longer than third labial article; fore Tarsus: WithUNMOoOdted:ClaAWS 1.4. 8 Shed er len LE eset 16 Synthilipsis ~ 1/4 of vertex width; blackish brown hoof print-like pattern at hemelytra in dorsal view; apex of fore femur widened .................ccccceceeeeees petri Oat nuee tach beige Metre O78 Buenoa konta Nieser & Pelli, 1994 (Fig. 10E) Synthilipsis < 1/4 of vertex width; hemelytra without such pattern; apex of FORESTS RNUF IMO WE SINC eee. sencerex cps vcecexsporccorenasaicciken am tpeecindebecsapaxeberaa eens 17 Synthlipsis very narrow, < 1/10 of vertex width; frons narrow; labrum sided by pair of tufts of setae (Fig. 7B); labial prong slightly longer than third labial article, with apex rounded........ Buenoa amnigenus (White, 1879) (Fig. 10A) Synthlipsis narrow, > 1/10 of vertex width; frons wide; labrum without tufts of setae; labial prong subequal to slightly longer than third labial article, with apex sinuous (Fig. 7C)........ Buenoa salutis Kirkaldy, 1904 (Fig. 10J). ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 248 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil on - —— , y 4 Figure 1. Anisopinae and Notonectinae, examples of structures A, B scutellum and anterior part of hemelytra, dorsal view A Notonectinae B Anisopinae C-E head, anterior view, outline of labrum highlighted C Martarega D Enitharoides E Buenoa. Figure 2. Notonectini, morphological characteristics A Enitharoides, foveate anterolateral portion of pronotum delimited by dotted line B, C Enitharoides brasiliensis B punctation of pronotum, dorsal view C middle femur, ventral view D No- tonecta disturbata, unfoveate anterolateral portion of pronotum E, F Enitharoides tricomerus E punctation of pronotum, dorsal view F middle femur, ventral view. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 249 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Figure 3. Martarega, morphological characteristics A Martarega bentoi, middle trochanters, ventral view, small groups of ensiform bristles delimited by dotted line. Trochanters of right image without dots B M. brasiliensis, dorsal view of scute- llum, hyaline apex delimited by absence of dotted pattern C M. membranacea, dorsal view of scutellum. Figure 4. Buenoa, structures of two species, highlighted with black dots in right illustrations A B. tarsalis, emarginated first article of middle tarsus, ventral view B B. fuscipennis, posteroventral portion of fore trochanters, ventral view. Right illustrations modified from Truxal 1953. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 250 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Figure 5. Buenoa, structures of two species A B. unguis, male fore tarsus, ventral view B B. pseudomutabilis, male abdom- inal ventral laterotergite |, ventral view. C Figure 6. Martarega and Buenoa, measurements of head and fore femur A Martarega, head, dorsal view B—D Buenoa B head, dorsal view C length of labial prong, lateral view D fore femur, ventral view, black arrow indicates stridulatory area. Abbreviations: ew = eye width, fl = femoral length, fw = femoral width, oc = ocular commissure, s = synthlipsis width, v = vertex width. Scale bars: 1 mm. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 251 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil psp ys Figure 7. Buenoa, male head, lateral view A Buenoa femoralis B B. amnigenus C B. salutis D B. fuscipennis. Scale bars: 1mm. Figure 8. Notonecta, male genital capsule, lateral view, modified from Hungerford 1933 A Notonecta disturbata B N. pul- chra. Abbreviations: cap = caudoventral protuberance, par = paramere. New records Subfamily Anisopinae Buenoa Kirkaldy, 1904 Buenoa amnigenus (White, 1879) Fig. 10A Anisops amnigenus White, 1879: 271 [original description]. Buenoa amnigenus; Kirkaldy (1904): 120 [genus transfer]. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 252 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Diagnosis. Small species, male length 4.8-5.4 mm. Synthlipsis very narrow, < 1/10 of vertex width. Labrum sided by pair of tufts of setae. Labial prong slightly longer than third labial article, originating proximally on article. Fore femur without stridulatory area. Taxonomic notes. A member of the salutis group. It differs from the most similar species, B. amnigenoidea Nieser, 1970, by the chaetotaxy of the labrum and minor characteristics of the fore trochanter, femur, and tibia. Also, from B. amnigenopsis Nieser, 1975 by the presence of a notch on the apex of the fore femur of this species, which is absent in B. amnigenus. Finally, it can be distinguished from B. salutis based on the larger size, narrower synthlipsis and more pronounced tylus. More detailed comparisons between species of this group can be found in Barbosa and Nessimian (2013a). Distribution. Argentina (Bachmann 1971). Bolivia (Truxal 1953). Brazil: AL [new record], AM (White 1879; Truxal 1953; Nieser 1975; Barbosa and Nessim- ian 2013a; Barbosa and Rodrigues 2013), BA [new record], CE (Truxal 1953; Nieser 1975; this work), GO (Truxal 1957), MG (Valbon et al. 2021), MS (Truxal 1953), MT (Heckman 1998), PA (Truxal 1953; Barbosa and Nessimian 2013a), PB (Truxal 1953; Nieser 1975), PE (Truxal 1953; Nieser 1975; this work), PI [new record], RN (Truxal 1953; Nieser 1975), SP (Castanhole et al. 2013; Pereira et al. 2015a), TO (Truxal 1957). Guyana (Truxal 1953). Paraguay (Truxal 1953). Peru (Truxal 1953). Suriname (Nieser 1975). Trinidad & Tobago (Nieser and Alkins-Koo 1991). Material examined. BRAZIL, !AL, 2018: 1 4: Campo Grande municipality, acude, AL6 station, 07.VII.2018. -9.9436, -36.8275. C.FB. Floriano, J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81609; 1 <, 1 9: Piagabucu municipality, Rio Piaui, 02.V.2018. -10.347, -36.4828. C.F.B. Floriano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81703. !BA, 2018: 1 4: Lencdis municipality, PNCD, Ribeirao do Meio, Terra 9 station, 341 m, 22.VIII.2018. -12.586, -41.3817. C.C. Goncalves col., CEIOC 81907. CE, 2019: 2 4: Aiuaba municipality, EEA, casa da gameleira, Terra 1 sta- tion, light trap, 517 m, 09.1V.2019. -6.6976, -40.2812. J.M.S. Rodrigues col., CEIOC 81901; 1 J, 1 2: same data, except: Sitio Volta de Cima, sede do ICMBIO, Terra 4 station, light trap, 460 m, 10.IV.2019. -6.6025, -40.1286, CZMA; 1 3: same data, except: Sitio boa Vista, Terra 6 station, light trap, 583 m, -6.7256, -40.2226, CZMA; 1 3: same data, except: Terra 8 station, light trap, 650 m, 11.1V.2019. -6.7425, -40.3065. C.C. Goncalves col., CZMA; 1 4, 1 2: same data, except: Sitio do Mar- tins, Terra 10 station, light trap, 476 m, 12.I1V.2019. -6.6667, -40.1750. J.S. Prando col., CEIOC 81899; 1 4: same data, except: C.C. Goncalves col., CEIOC 81898; 1 3, 1 2: same data, except: J.M.S. Rodrigues col., CZMA; 1 <, 15 2: same data, except: casa da gameleira, Agua 1 station, 532 m, 09.IV.2019. -6.6992, -40.2908, CEIOC 81900; 2 2, 3 2: same data, except: Acude do Letreiro, Agua 12 station, 475 m, 13.1V.2019. -6.6163, -40.1545, CEIOC 81902; 2 3, 3 2: same data, except: CEIOC 81902. Same state, 2021: 6 3, 4 2: same data, except: estrada, Terra 3 sta- tion, light trap, 505 m, 08.V1.2021. -6.6974, -40.2819, CEIOC 81906; 7 4, 1 9: same data, except: C.C. Gongalves col., CEIOC 82012; 2 “, 1 9: same data, except: Terra 5 station, light trap, 493 m, 03.V1.2021. -6.7003, -40.1919, CZMA; 6 @, 2 2: same data, except: estrada, Terra 11 station, light trap, 634 m, 05.VI.2021. -6.7259, -40.3065. C.C. Goncalves col., CZMA; 2 3’, 2 9: same data, except: estrada prdx- ima ao riacho, Terra 16 station, light trap, 498 m, 06.VI.2021. -6.6872, -40.2683. CZMA; 1 3, 4 2: same data, except: Terra 19 station, light trap, 634 m, 07.VI.2021. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 253 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil -6.7259, -40.3065, CZMA; 1 3: same data, except: C.C. Goncalves col., CZMA; 1 3,1 2: same data, except: Sitio Jatoba, acude, Agua 1 station, 571 m, 06.VI.2021. -6.7351, -40.2424. J.M.S. Rodrigues & F.F.F. Moreira cols., CZMA; 3 3, 2 9: same data, except: Sitio Volta de Cima, lago, Agua 4 station, 434 m, 05.V1.2021. -6.6019, -40.1246, CZMA; 16 4, 15 9, 4 nymphs: same data, except: Sitio Volta de Baixo, acude, Agua 8 station, 431 m, 06.VI.2021. -6.6263, -40.1339, CEIOC 81905; 7 3, 7 2: same data, except: braco de rio, acude, Agua 11 station, 513 m, 07.VI.2021. -6.6997, -40.1917, CZMA. PE, 2019: 2 3,1 2: Tupanatinga municipality, PNCA, Fa- zenda Laranjeiras, Terra 18 station, light trap, 610 m, 20.11.2019. -8.4618, -37.3273. J.M.S. Rodrigues col., CZMA; 2 3,3 2: same data, except: CEIOC 81904. !PI, 2020: 1 3, 1 2: Caracol municipality, PNSC, estrada proxima do Povoado Capim, Terra 15 station, light trap, 17.11.2020. -9.2149, -43.5034. A.A. Alves col., CEIOC 81903. Buenoa femoralis (Fieber, 1851) Fig. 10B Anisops femoralis Fieber, 1851: 483 [original description]. Buenoa femoralis; Kirkaldy (1904): 120 [genus transfer]. Diagnosis. Large species, male length 7.8-8.6 mm. Synthlipsis wide, nearly 1/2 of vertex width. Labial prong much longer than third labial article, originating slightly after half of article. Fore femur slightly widened at apex, with ~ 17 ridg- es in a triangular stridulatory area. Taxonomic notes. Buenoa femoralis is one of the largest species of the ge- nus in Brazil, together with B. antigone antigone, B. crassipes (Champion, 1901), and B. oreia Nieser, Melo, Pelli & Barbosa, 1997. It is usually larger than the first two species and smaller than the last one, and shows different shapes of the fore femur, stridulatory area, and labial prong. The closest species in northeast- ern Brazil is B. pallipes, which is a distinctly smaller species, with differently shaped labial prong. Distribution. Brazil: AM (Barbosa and Nessimian 2013a), PI [new record], PR (Jaczewski 1928). Peru (Truxal 1953). Puerto Rico (Fieber 1851). U.S. Virgin Islands (Barber 1939). Material examined. BRAZIL, !PI, 2018: 1 <4, 2 9, 4 nymphs: Caracol munici- pality, PNSC, entre o Mirante “Janela do Sertao” e 0 cemitério, Agua 2 station, 566 m, 10.XII.2018. -9.2188, -43.4902. J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 82007; 1 4: same data, except: Guaribas municipality, acude, Agua 10 station, 640 m, 14.XII.2018. -9.3649, -43.7546, CEIOC 82006; 1 3, 2 2, 1 nymph: same data, except: Caracol municipality, Agua 13 station, 526 m, 15.XII.2018. -9.2140, -43.4965, CZMA; 2 4: same data, except: proximo a estrada, Terra 6 station, 11.XII.2018. -9.2137, -43.4986. C.C. Goncalves col., CEIOC 82080. Same state, 2020: 4 3’, 2 2: same data, except: pocas ao lado da estrada proximo ao cemitério, Agua 4 station, 565 m, 13.11.2020. -9.2185, -43.4904. J.M.S. Rodrigues & I.R.S. Cordeiro cols., CEIOC 81910; 1 4: same data, except: Povoado Sobrado, alagado em drea de pasto, Agua 11 station, 499 m, 16.11.2020. -9.2111, -43.5202, CEIOC 81908; 1 4, 8 2: same data, ex- cept: Guaribas municipality, brejao, acude, Agua 12 station, 640 m, 18.11.2020. -9.3650, -43.7544, CEIOC 81909. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 254 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Buenoa fuscipennis (Berg, 1879) Fig. 10C Anisops fuscipennis Berg, 1879: 198-199 [original description]. Anisops naias Kirkaldy, 1899e: 194 [synonym; Truxal (1953): 1460]. Buenoa fuscipennis; Kirkaldy (1904): 120 [genus transfer]. Buenoa dentipes Jaczewski, 1928: 127 [synonym; Truxal (1953): 1460]. Diagnosis. Medium to large species, male length 6.8-—7.2 mm. Synthlipsis wide, slightly < 1/2 of vertex width. Labial prong shorter than third labial article, origi- nating proximally on article. Fore trochanter with a conspicuous process pointing backwards. Fore femur without stridulatory area. Middle tibia widened at apex. Distribution. Argentina (Berg 1879). Bolivia (Truxal 1953). Brazil: CE [new record], MT (Heckman 1998), PA (Barbosa and Nessimian 2013a; Nobre et al. 2019), PE [new record], PR (Jaczewski 1928), SC (Truxal 1953). Chile (Kirkaldy 1899a). Par- aguay (Truxal 1953). The record from Venezuela (Kirkaldy 1904) is questionable. Material examined. BRAZIL, !CE, 2019: 4 4, 2 9: Aiuaba municipality, EEA, Si- tio Jatoba, acude alagado, Agua 8 station, 572 m, 11.1V.2019. -6.7346, -40.2429. J.M.S. Rodrigues col., CEIOC 81922; 2 4, 1 9: same data, except: Sitio Volta de Baixo, Terra 12 station, light trap, 441 m, 14.1V.2019. -6.6254, -40.1336, CZMA. IPE, 2019: 4 4: Tupanatinga municipality, PNCA, Fazenda Brejo de Sao José, poca temporaria, Agua 8 station, 700 m, 16.III.2019. -8.506, -37.2237. H. Ro- drigues & J.M.S. Rodrigues cols., CEIOC 82004; 1 male, 3 2: same data, except: Fazenda Laranjeiras, poca temporaria ao lado da estrada, Agua 9 station, 325 m, 17.11.2019. -8.5002, -37.3111, CZMA; 10 4: same data, except: Chapadao, poca temporaria, Agua 18 station, 957 m, 20.11.2019. -8.5244, -37.2394, CEl- OC 82003; 1 4, 4 2: same data, except: Buique municipality, trilha para Sitio Arqueologico Alcobaga, Terra 3 station, light trap, 658 m, 15.1II.2019. -8.5274, -37.1945, CZMA; 1 4, same data, except: Fazenda do Brejo, Terra 7 station, light trap, 706 m, 16.111.2019. -8.5199, -37.2249, CZMA; 3 4, 1 2: same data, except: Tupanatinga municipality, estrada do gado, Terra 14 station, light trap, 19.111.2019. -8.4866, -37.3404, CEIOC 82005. Same state, 2021: 2 4: same data, except: Barro branco, Comunidade Muquém, acudes, Agua 1 station, 824 m, 10.11.2021. -8.5001, -37.3113. J.M.S. Rodrigues &R. Jordao cols., CEIOC 81923. Buenoa koina Nieser & Pelli, 1994 Fig. 10D Buenoa koina Nieser & Pelli, 1994: 3, 4, figs 8-10 [original description]. Diagnosis. Medium-sized species, male length ~ 5.9 mm. Synthlipsis wide, slightly > 1/2 of vertex width. Labial prong subequal to slightly shorter than third labial article, originating proximally on article. Fore femur with weak strid- ulatory area containing 4-6 ridges. Taxonomic notes. Buenoa koina is one of smallest species of the genus with wide synthlipsis. It can be distinguished from the most similar species, B. pallens (Champion, 1901) and B. pallipes (Fabricius, 1803), by the pronotum not tricarinate and the shorter length of the labial prongthan in the two aforementioned species. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 255 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Distribution. Brazil: BA [new record], MG (Nieser and Pelli 1994; Nieser and Melo 1997; Carrenho et al. 2020). Material examined. BRAZIL, !BA, 2018: 4 3’, 1 2: Mucugé municipality, PNCD, Agua 3 station, 19.VIII.2018. -12.9908, -41.3507. J.M.S. Rodrigues col., CEIOC 81921. Same state, 2021: 1 3, 2 9: same data, except: Palmeiras municipali- ty, Rio Preto, Agua 1 station, 820 m, 05.V.2021. -12.6036, -41.5250. J.M.S. Ro- drigues & J.F. Barbosa cols., CEIOC 81920. Buenoa konta Nieser & Pelli, 1994 Fig. 10E Buenoa konta Nieser & Pelli, 1994: 1-3, figs 1-4 [original description]. Diagnosis. Very small species, male length 3.7—4.3 mm. Synthlipsis narrow, 1/4 of vertex width). Labial prong subequal in length to third labial article, origi- nating proximally on article. Blackish brown hoof print-like pattern at hemelytra in dorsal view. Fore femur with wide apex, without stridulatory area. Taxonomic notes. Buenoa konta and B. salutis are the two smallest species of Buenoa occurring in Brazil. The former has a conspicuous blackish brown hoof print-like pattern on the hemelytra in dorsal view. This mark, with other morphological features like the short labial prong and the wide apex of the fore femur, ensures an easy identification. Distribution. Brazil: AL [new record], BA [new record], CE [new record], GO (Barbosa and Dias-Silva 2017), MG (Nieser and Pelli 1994; Nieser and Melo 1997; Melo and Nieser 2004; Barbosa and Rodrigues 2013; Carrenho et al. 2020), MS (Barbosa et al. 2010c), PA (Barbosa et al. 2010a; Barbosa and Nes- simian 2013a), RJ (Ribeiro et al. 2010), SE [new record]. Material examined. BRAZIL, !AL, 2018: 1 4: Maragogi municipality, APACC, APACC2 station, 29.IV.2018. -8.922, -35.1796. C.F.B. Floriano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81700; 1 4, 2 nymphs: same data, except: Muri- ci municipality, EEM, EEM5 station, 28.IV.2018. -9.2540, -35.8010, CEIOC 81698. IBA, 2021: 2 4, 6 2, 1 nymph: Andaraji municipality, PNCD, Rio Garapa, Agua 5 station, 08.V.2021. -12.7456, -41.3453. J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81915. ICE, 2021: 2 3: Aiuaba municipality, EEA, sitio Volta de Cima, lago, Agua 4 station, 434 m, 05.VI.2021. -6.6019, -40.1246. J.M.S. Rodrigues col., CEIOC 81916. !SE, 2018: 4 3, 8 2, 5 nymphs: Areia Branca municipality, PNSI, Riacho Negro, PNSI2 station, 08.VII.2018. -10.7475, -37.3402. C.F.B. Flo- riano, J.F. Barbosa & J.M.S. Rodrigues cols., CEIOC 81621. Buenoa mutabilis Truxal, 1953 Fig. 10F Buenoa mutabilis Truxal, 1953: 1432-1435, fig. 61 [original description]. Diagnosis. Medium-sized species, male length 5.2-6.0 mm. Synthlipsis nar- row, ~ 1/3 of vertex width. Labial prong with variable shape, longer than third ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 256 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil labial article, originating proximally on article. Fore femur not widened at apex; stridulatory area subtriangular, with 10-18 ridges. Distribution. Brazil: CE [new record], GO (Truxal 1957), MG (Truxal 1957; Nieser and Melo 1997; Vianna and Melo 2003; Melo and Nieser 2004), PI (Taki- ya et al. 2016; this work), SE [new record]. Guyana (Truxal 1953). Haiti (Truxal 1953). Paraguay (Truxal 1953). Peru (Truxal 1953). U.S. Virgin Islands (Rogers and Cruz-Rivera 2021). Venezuela (Truxal 1953). Material examined. BRAZIL, !CE, 2021: 3 3, 2 2: Aiuaba municipality, EEA, estrada, Terra 3 station, light trap, 505 m, 08.V1.2021. -6.6974, -40.2819. J.M.S. Rodrigues col., CEIOC 82001; 1 4, 2 9: same data, except: estrada préximo ao riacho, Terra 16 station, light trap, 498 m, 06.VI.2021. -6.6871, -40.2683, CZMA; 18 3, 11 9: same data, except: acude/riacho, Agua 3 station, 507 m, 04.VI.2021. -6.6921,-40.1871. J.M.S. Rodrigues & C.C. Gongalves cols., CEl- OC 81914. PI, 2018: 9 4, 12 9: Guaribas municipality, PNSC, poca préxima ao “Museu do Vaqueiro”, 525 m, 11.XII.2018. -9.1379, -43.5972. J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 82002. !SE, 2018: 2 4, 1 2, 4 nymphs: Areia Branca municipality, Riacho Vermelho, PNSI1 station, 08.VII.2018. -10.7387, -37.33547. C.F.B. Floriano, J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81681. Buenoa pallipes (Fabricius, 1803) Fig. 10G Notonecta pallipes Fabricius, 1803: 103 [original description]. Anisops pallipes; Stal (1868): 137 [genus transfer]. Buenoa pallipes; Kirkaldy (1904): 123 [genus transfer]. Diagnosis. Medium-sized species, male length 5.5-6.2 mm. Synthlipsis wide, slightly < 1/2 of vertex width. Labial prong arc-shaped, distinctly longer than third labial article, originating distally on article. Fore femur apex widened; strid- ulatory area subtriangular, with 17 ridges. Taxonomic notes. Another medium-sized species, B. pallipes is similar to B. mutabilis and B. platycnemis (Fieber 1851). However, it has the apex of the fore femur wider and the labial prong longer than in the former species, and the labial prong more parallel to the axis of the frons than in the latter. Distribution. Barbados (Nieser 1967). Bolivia (Kirkaldy 1899d). Brazil: AL [new record] AM (Nieser 1970), PA (Nieser 1970), PE [new record]. Colombia (Kirkaldy 1899c). Costa Rica (de la Torre-Bueno 1906). Cuba (Nieser 1967). Ec- uador (Kirkaldy 1899c). Guadeloupe (Kirkaldy 1904). Hawaiian Islands (Kirkaldy 1910). Honduras (Truxal 1953). Jamaica (Kirkaldy 1900). Martinique (Kirkaldy 1904). Mexico (Champion 1901). Panama (Kirkaldy 1899b). Paraguay (Truxal 1953). Peru (Truxal 1953). Puerto Rico (Fieber 1851). St. Barthélemy (Lethierry 1881). St. Vincent & The Grenadines (Uhler 1893). U.S. Virgin Islands (Fieber 1851). Records from North America north of Mexico are erroneous. Material examined. Brazil, !AL, 2018: 1 3, 1 2: Quebrangulo municipality, RBPT, Sitio Juliana, brejo, PPT4 station, 04.VII.2018. -9.2608, -36.4157. C.F.B. Floriano, J.M.S. Rodrigues and J.F. Barbosa cols., CEIOC 81705. !PE, 2019: 5 4, 11 9, 6 nymphs: Tupanatinga municipality, PNCA, pogo, aproximadamente 400 m da ZooKkeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 257 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil casa dos brigadistas, Agua 1 station, 818 m, 14.1II.2019. -8.5725, -37.2367. H. Ro- drigues & J.M.S. Rodrigues col., CEIOC 82011. Same state, 2021: 2 4,2 9: same data, except: Buique municipality, olho d’a4gua do pico, Agua 10 station, 763 m, 15.11.2021. -8.5577, -37.1951. J.M.S. Rodrigues & R. Jordao cols., CEIOC 82079; 20 4, 16 2: same data, except: Tupanatinga municipality, nascente do ICMBIO, brejo, Agua 11 station, 807 m, 16.III.2021. -8.5724, -37.2368, CEIOC 81918. Buenoa platycnemis (Fieber, 1851) Fig. 10H Anisops platycnemis Fieber, 1851: 485 [original description]. Buenoa platycnemis; Kirkaldy (1904): 123 [genus transfer]. Diagnosis. Medium to large species, male length 4.6—5.4 mm. Synthlipsis nar- row, slightly < 1/2 of vertex width. Labial prong straight, much longer than third labial article, originating distally on article. Fore femur with apex widened; strid- ulatory area subtriangular, with 11-14 ridges. Taxonomic notes. Similar to other medium-sized species, like the aforemen- tioned B. mutabilis and B. pallipes. A thorough examination of the morphological characteristics described for each of these species is necessary for their correct identification. Distribution. Argentina (Kirkaldy 1904). Bonaire (Nieser 1967). Brazil: AM (Barbosa and Nessimian 2013a), GO (Truxal 1957), MA (Truxal 1953), MT (Nies- er 1970), PA (Nieser 1970; Barbosa and Nessimian 201 3a; Nobre et al. 2019), PE [new record], TO (Truxal 1957), RJ (Kirkaldy 1904; Ribeiro et al. 1998, 2010; Nessimian and Ribeiro 2000; Barbosa et al. 2010c), SE [new record]. Cayman Islands (Truxal 1953). Colombia (Truxal 1953). Costa Rica (Truxal 1953). Cuba (Uhler 1884). Curacao (Nieser 1967). Guadeloupe (Nieser 1967). Haiti (Truxal 1953). Jamaica (Truxal 1953). Martinique (Truxal 1953). Mexico (Uhler 1884). Nicaragua (Lopez et al. 1998). Panama (Truxal 1953). Peru (Truxal 1953). Puer- to Rico (Fieber 1851). St. Martin (Nieser 1967). Trinidad & Tobago (Nieser and Alkins-Koo 1991). United States (Uhler 1884). Venezuela (Truxal 1953). U.S. Virgin Islands (Fieber 1851). Material examined. !PE, 2019: 1 3: Tupanatinga municipality, PNCA, Ri- acho de Leis, pocas tempordarias ao longo do leito, Agua 14 station, 750 m, 18.111.2019. -8.5829, -37.2445. J.M.S. Rodrigues & H. Rodrigues cols., CEIOC 81919. ISE, 2018: 1 3: Estancia municipality, Complexo de Dunas da Praia do Saco, REBIOSI17 station, 05.V.2018. -11.4190, -37.3223. C.F.B. Floriano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81624; 1 4: same data, except: Can- hoba municipality, agude, SE1 station, 07.VII.2018. -10.1287, -36.9698. C.F.B. Floriano, J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81627. Buenoa pseudomutabilis Barbosa, Ribeiro & Nessimian, 2010 Fig. 10 Buenoa pseudomutabilis Barbosa, Ribeiro & Nessimian, 2010: 561-564, figs 1, 10-14 [original description]. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 258 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Diagnosis. Medium-sized species, male length 5.8-6.0 mm. Synthlipsis nar- row, ~ 2/5 of vertex width. Tylus inflated and pubescent. Labial prong longer than third labial article, originating proximally on article. Fore femur narrowed at apex; stridulatory area subtriangular, with 14 ridges. Dark nodule on abdom- inal ventral laterotergite I. Taxonomic notes. Buenoa pseudomutabilis greatly resembles B. mutabilis, hence the specific name. This species differs from B. mutabilis in the lower width of head/anterior width of vertex ratio (5.0—5.4 in B. pseudomutabilis, 6.5 in B. mutabilis) and the fewer teeth on the stridulatory comb of the fore tibia (21-25 teeth in B. pseudomutabilis, 33-38 in B. mutabilis). Distribution. Brazil: BA [new record], GO (Barbosa and Dias-Silva 2017), Pl (Takiya et al. 2016), RJ (Barbosa et al. 2010c). Material examined. BRAZIL, !BA, 2018: 1 3: Mucugé municipality, PNCD, Agua 11 station, 23.VIII.2018. -13.2932, -41.2414. J.M.S. Rodrigues & F.F.F Moreira cols., CEIOC 81917. Buenoa salutis Kirkaldy, 1904 Fig. 10J Buenoa salutis Kirkaldy, 1904: 124 [original description]. Buenoa mallochi Jaczewski, 1928: 129-130, figs 23-27 [synonym; Truxal (1953): 1469]. Diagnosis. Small species, male length 3.4—4.0 mm. Synthlipsis narrow, ~ 1/10 tenth of vertex width. Labial prong subequal to slightly longer than third labi- al article, originating medially on article. Fore femur narrowed at apex, with- out stridulatory area. Distribution. Argentina (Bachmann 1962). Bolivia (Truxal 1953). Brazil: AL [new record], AM (Truxal 1953; Nieser 1970; Barbosa and Nessimian 2013a), BA [new record], CE (Truxal 1953; this work), MG (Nieser and Melo 1997; Melo and Nieser 2004; Barbosa and Rodrigues 2013), MS (Floriano et al. 2013), MT (Heckman 1998), PA (Truxal 1953; Nieser 1970; Barbosa and Nessimian 2013a), PB (Truxal 1953), PE (Truxal 1953), PI (Takiya et al. 2016), PR (Jaczewski 1928), RJ (Ribeiro et al. 1998, 2010), RR (Barbosa and Nessimian 2013a), RS (Truxal 1953; Kleerekoper 1955), SE [new record], SP (Truxal 1953), TO (Truxal 1957). Colombia (Roback and Nieser 1974). French Guiana (Kirkaldy 1904). Guyana (Truxal 1953). Paraguay (Truxal 1953). Suriname (Nieser 1968). Trinidad & To- bago (Nieser and Alkins-Koo 1991). Venezuela (Truxal 1953). Material examined. BRAZIL, !AL, 2018: 3 @, 2 2, 3 nymphs: Maragogi mu- nicipality, APACC, APACC2 station, 29.1V.2018. -8.922, -35.1795. C.F.B. Flori- ano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81695; 1 4, 2 2: same data, except: Piagabucu municipality, APAP, Rio Piaui, 02.V.2018. -10.3470, -36.4828, CEIOC 81697; 1 4: same data, except: Feliz Deserto municipality, APAP, APAP3 station, -10.3252, -36.3506, CEIOC 81696. Same state, 2019: 1 3, 1 2: Marimbondo municipality, Flexeiras, agude, ALSE11 station, 122 m, 23.V.2019. -9.5074, -36.2340. J.M.S. Rodrigues, W. Souza & F.F.F. Morei- ra cols., CEIOC 81955. !BA, 2018: 2 4, 1 2: Len¢dis municipality, PNCD, Ri- beirao do Meio, Terra 9 station, 341 m, 22.VIII.2018. -12.586, -41.3817. J.S. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 259 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Prando col., CEIOC 81912. CE, 2019: 2 4, 1 9: Aiuaba municipality, EEA, casa da gameleira, Terra 1 station, light trap, 517 m, 09.1V.2019. -6.6976, -40.2812. J.M.S. Rodrigues col., CEIOC 81913; 1 4: same data, except: Sitio boa Vista, Terra 6 station, light trap, 583 m, 10.1V.2019. -6.7256, -40.2226, CZMA; 1 3: same data, except: Sitio do Martins, Terra 10 station, light trap, 476 m, 12.IV.2019. -6.6667, -40.1750. J.S. Prando col., CZMA. Same state, 2021: 15 4, 12 2: same data, except: estrada, Terra 11 station, light trap, 634 m, 05.V1.2021. -6.7259, -40.3065. J.M.S. Rodrigues col., CEIOC 81911. !SE, 2018: 1 4, 2 9: Areia Branca Municipality, PNSI, Riacho Negro, PNSI2 sta- tion, 08.VII.2018. -10.7475, -37.34025. C.F.B. Floriano, J.F. Barbosa & J.M.S Rodrigues cols., CEIOC 81610. Buenoa tarsalis Truxal, 1953 Fig. 10K Buenoa tarsalis Truxal, 1953: 1392-1395, fig. 49 [original description]. Diagnosis. Medium to large species, male length 6.2—7.2 mm. Synthlipsis wide, ~ 1/2 of vertex width. Labial prong longer than third labial article, originating proximally on article. Fore femur with apex narrowed; stridulatory area oblong, with 17-23 ridges. First article of middle tarsus deeply emarginated. Taxonomic notes. Buenoa tarsalis resembles B. femoralis but has a very con- spicuous emargination on the first article of the middle tarsus, which ensures its correct identification. Note. The most abundant and widespread species in this survey, present in all studied states. Distribution. Brazil: AL [new record], AM (Nieser 1970; Barbosa and Nes- simian 2013a), BA [new record], CE (Truxal 1953; this work), GO (Barbosa and Dias-Silva 2017), MG (Nieser and Melo 1997; Melo and Nieser 2004; Gutiérrez et al. 2017a, b), PA (Truxal 1953; Barbosa and Nessimian 2013a), PB (Truxal 1953), PE (Truxal 1953; this work), PI (Takiya et al. 2016; this work), RJ (Truxal 1953; Barbosa et al. 2010c), RN (Truxal 1953), SE [new record]. Material examined. BRAZIL, !AL, 2018: 2 ¢, 1 9: Campo Grande municipali- ty, agude, AL6 station, 07.VII.2018. -9.9436, -36.8275. C.F.B. Floriano, J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81613; 15 3, 14 2: same data, except: rio, AL7 station, -9.9559, -36.8373, CEIOC 81611; 3 4, 3 9, 1 nymph, same data, except: Coité do Noia municipality, Estrada AL-110, Rio Coruripe, AL5 station, 06.VII.2018. -9.6987, -36.5845, CEIOC 81684; 1 <4: same data, except: Maragogi municipality, APACC, APACC2 station, 29.IV.2018. -8.922, -35.1795, C.F.B. Floriano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81614; 9 3, 9 2 19 nymphs: same data, except: Quebrangulo municipality, RBPT, sitio Ju- liana, brejo, PPT4 station, 04.VII.2018. -9.2608, -36.4157. C.F.B. Floriano, J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81683. Same state, 2019: 13 6, 12 9, 9 nymphs: Marimbondo flexeiras municipality, agude, ALSE11 station, 122 m, -9.5074, -36.2340. J.M.S. Rodrigues, W. Souza & F.F.F. Moreira cols., CEIOC 82066; 16 4, 14 2, 3 nymphs: same data, except: Minador do Negrao municipality, agude, ALSE13 station, 253 m, 23.V.2019. -9.3679, -36.8425, ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 260 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil CEIOC 82073. !BA, 2018: 1 4: Lencdis municipality, PNCD, Ribeirao do Meio, Terra 9 station, 341 m, 22.VIII.2018. -12.586, -41.3817. J.S. Prando col., CEI- OC 82039. CE, 2019: 1 4, 9 nymphs: Aiuaba municipality, EEA, Sitio do Mar- tins, casa da gameleira, Agua 1, 532 m, 09.IV.2019. -6.6992, -40.2908. J.M.S. Rodrigues col., CZMA; 2 4, 3 2: same data, except: area alagada ao lado da estrada para a casa do cajueiro, Agua 4 station, 508 m, 10.IV.2019. -6.6923, -40.1873, CEIOC 81996; 2 4, 5 2, 7 nymphs: same data, except: Sitio Boa Vista, area alagada, Agua 7 station, 570 m, 11.1V.2019. -6.7255, -40.2226, CE- IOC 82075; 2 3, 8 2: same data, except: Sitio Jatoba, acude alagado, Agua 8 station, 572 m, -6.7346, -40.2429, CZMA; 3 3, 8 2, 2 nymphs: same data, ex- cept: Vaginha da Gameleira, acude, Agua 9 station, 510 m, 12.1V.2019. -6.6866, -40.2625, CZMA; 10 3, 6 2, 2 nymphs: same data, except: Acude do Letreiro, Agua 12 station, 475 m, 13.IV.2019. -6.6163, -40.1545, CEIOC 82000; 3 3, 14 2, 5 nymphs: Sitio Volta de Baixo, acude cheio, Agua 13 station, 431 m, -6.6263, -40.1339, CZMA; 1 <4: same data, except: Serra da Lagoa, Terra 8 station, light trap, 650 m, 11.1V.2019. V. Quintas col., CEIOC 82072; 3 4, 3 9: Sitio Volta de Baixo, Terra 12 station, light trap, 441 m, 14.IV.2019. -6.6254, -40.1336. J.M.S. Rodrigues col., CEIOC 81985. Same state, 2021: 1 4, 18 9,1 nymph: same data, except: Sitio Jatoba, acude, Agua 1 station, 571 m, 03. VI.2021. -6.7351, -40.2424. J.M.S. Rodrigues & F.F.F Moreira cols., CZMA; 10 3, 2 9: same data, except: brejo, Agua 6 station, 570 m, 05.VI.2021. -6.7263, -40.2229, CEIOC 81997; 4 2, 31 2: same data, except: poca, Agua 10 station, 507 m, -6.6866, -40.2625, CZMA; 8 3, 4 2, 10 nymphs: same data, except: braco de rio, acude, Agua 11 station, 513 m, 07.VI.2021. -6.6997, -40.1917, CEIOC 81998; 4 3, 6 2: same data, except: brejo, Agua 12 station, 584 m, -6.7384, -40.2475, CZMA; 7 3,2 9: same data, except: estrada, Terra 3 station, light trap, 505 m, 08.V1.2021. -6.6974, -40.2819. J.M.S. Rodrigues col., CZMA; 1 3: same data, except: C.C. Goncalves col., CEIOC 82069; 4 4, 2 2; same data, except: estrada, Terra 5 station, light trap, 493 m, 03.V1.2021. -6.7003, -40.1919. J.M.S. Rodrigues col., CZMA; 2 3’, 2 2: same data, except: estrada ao lado do brejo, Terra 8 station, light trap, 486 m, 04.VI.2021. -6.6920, -40.1870, CZMA; 2 &, 2 2: same data, except: estrada, Terra 11 station, light trap, 634 m, 05.V1.2021. -6.7259, -40.3065, CZMA; 5 @, 4 9: same data, ex- cept: estrada prox. ao riacho, Terra 16 station, light trap, 498 m, 06.VI.2021. -6.6871, -40.2683, CEIOC 81999. PE, 2019: 3 4, 8 9: Tupanatinga municipality, PNCA, caldeiroes, aproximadamente 600 m da torre dos brigadistas, pocas tempordarias, Agua 3 station, 783 m, 14.1II.2019: -8.5642, -37.2389. H. Ro- drigues & J.M.S. Rodrigues cols., CEIOC 82064; 11 4, 10 2: same data, ex- cept: poca temporaria na trilha da casa da farinha, Agua 4 station, 814 m, -8.5615, -37.2340, CEIOC 82070; 3 4, 6 9: same data, except: Barreiro do Piti- ti, poca temporaria, Agua 5 station, 832 m, -8.5599, -37.2375, CEIOC 82030; 4 3: same data, except: Bufique municipality, rlacho salgado do inicio da trilha para 0 sitio arqueoldgico Alcobaca, pocas temporarias, Agua 6 station, 670 m, 15.11.2019. -8.5261, -37.1938. H. Rodrigues & J.M.S. Rodrigues cols., CEI- OC 82041; 4 3, 20 2: same data, except: brejo, perto da sede, poca temporaria, Fazenda Brejo de Sado José, Agua 7 station, 699 m, 16.III.2019. -8.5372, -37.2200, CEIOC 82035; 8 3: same data, except: poca temporaria, Agua 8 sta- tion, 700 m, -8.506, -37.2237, CEIOC 82034; 34 3, 22 2: same data, except: ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 261 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Fazenda Laranjeiras, poca temporaria ao lado da estrada, Agua 9 station, 825 m, 17.111.2019. -8.5002, -37.3111, CEIOC 82031; 1 4, 2 2, 3 nymphs: same data, except: Fazenda Jua, perto da sede, poca temporaria coberta de mac- rofitas, Agua 11 station, 541 m, -8.4116, -37.3601, CEIOC 82029; 2 4,1 9,1 nymph: same data, except: riacho temporario, Agua 12 station, 548 m, -8.4350, -37.3467, CEIOC 82027; 4 <, 8 2: same data, except: Riacho Catimbau, poca temporaria ao lado do leito, Agua 13 station, 745 m, 18.1II.2019. -8.5834, -37.2469, CZMA; 3 3, 3 2: same data, except: Riacho de Lejs, pocas tem- porarias ao longo do leito, Agua 14 station, 750 m, -8.5829, -37.2445, CEIOC 82023; 1 3, 4 2, 8 nymphs: same data, except: Caldeirdes da Igrejinha, pocas temporarias, Agua 17 station, 949 m, 20.11.2019. -8.5024, -37.2543, CEIOC 82022: 1 3: same data, except: Chapad4o, poca temporaria, Agua 18 station, 957 m, -8.5244, -37.2394, CZMA; 3 3, 1 2: same data, except: terreno do ICM- Bio, Terra 2 station, light trap, 730 m, 17.1I1.2019. -8.5274, -37.1945. J.M.S. Rodrigues col., CEIOC 82025; 1 3’, 2 9: same data, except: CZMA; 1 3: same data, except: trilha para Sitio Arqueoldgico do Alcobaga, Terra 3 station, light trap, 658 m, 15.1I1.2019. -8.5274, -37.1945. H. Rodrigues col., CEIOC 82024; 4 3, 9 9; same data, except: J.M.S. Rodrigues col., CEIOC 82036; 4 4: same data, except: Fazenda do brejo, Terra 7 station, light trap, 706 m, 16.1II.2019. -8.5199, -37.2249. C.C. Goncalves & D.M. Takiya cols., CZMA; 12 4, 13 9: same data, except: J.M.S. Rodrigues col., CEIOC 82042; 5 3, 7 2: same data, except: estrada do gado, Terra 14 station, light trap, 663 m, 19.III.2019. -8.4866, -37.3404. J.MS. Rodrigues col., CEIOC 82043; 1 3, 1 9: same data, except C.C. Goncalves col., CZMA. Same state, 2021: 4 4, 6 2: Tupanatinga municipality, PNCA, Barro branco, Comunidade Muquém, acudes, Agua 1 sta- tion, 824 m, 10.11.2021. -8.5001, -37.3113. J.M.S. Rodrigues & R. Jordao cols., CEIOC 81993; 2 3, 5 2: same data, except: poca ao lado da estrada, Agua 2 station, 904 m, -8.4982, -37.2852, CEIOC 81982; 1 4, 4 9: same data, except: regido dos Breus, trilha das umburanas, caldeirao, Agua 4 station, 940 m, 13.111.2021. -8.4891, -37.2637, CEIOC 81983; 3 4, 1 9, 3 nymphs: same data, except: caldeiroes em rocha, ao lado de estrada de chao perto da igrejinha, Agua 6 station, -8.5024, -37.2543, CEIOC 81989; 1 3, 6 9, 7 nymphs, 1 adult: same data, except: serrinha, caldeir6es em rocha, Agua 7 station, 924 m, -8.5188, -37.2337, CEIOC 81991; 5 4, 4 9: same data, except: Bufque munici- pality, Serra do Catimbau, acudes, Agua 9 station, 976 m, 14.1II.2021. -8.5791, -37.2147, CEIOC 81990; 13 4, 15 9; same data, except: Buique municipality, Fazenda Brejo de Sao José, brejo, bebedouro de cabras, Agua 13 station, 673 m, -8.5247, -37.1968, CEIOC 82068. PI, 2018: 3 4: Caracol municipality, acude, Agua 6 station, 512 m, 11.XII.2018. -9.2131, -43.4984. J.M.S. Rodrigues col., CEIOC 82037; 20 3, 24 2: Caracol municipality, PNSC, proximo a estrada, Ter- ra 6 station, -9.2137, -43.4986. C.C. Goncalves col., CEIOC 82065; 4 3: same data, except: J.M.S. Rodrigues col., CEIOC 82076; 4 4, 7 2: same data, except: proximo a estrada, Terra 8 station, light trap, 12.XII.2018. -9.2149, -43.5036. J.S. Prando col., CEIOC 82078; 2 4, 2 2: same data, except: CEIOC 82032; 3 3, same data, except: CEIOC 82038; 4 ¢, 11 2: same data, except: Jurema municipality, Sucumbido, Sede do Parque, Terra 11 station, 562 m, 13.XII.2018. -8.8597, -43.1817. J.M.S. Rodrigues col., CEIOC 82077. Same state, 2020: 1 3,1 2: same data, except: Guaribas municipality, pocas na estrada para Santa ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 262 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Luz, Agua 5 station, 685 m, 14.11.2020. -9.376, -43.7914, CEIOC 81995; 2 3,4 2: same data, except: Jurema municipality, Sucumbido, caldeirées, Agua 7 station, 549 m, 15.11.2020. -8.8792, -43.1658. J.M.S. Rodrigues & I.R.S. Cord- eiro cols., CEIOC 81986; 5 4; same data, except: area alagada perto da estra- da, Agua 8 station, 562 m, 15.11.2020. -8.8719, -43.1771, CEIOC 81984; 6 2,5 9: Caracol municipality,RPNSC, Povoado Sobrado, alagado em area de pasto, Agua 11 station, 499 m, 16.11.2020. -9.2111, -43.5202, CEIOC 81988; 3 3,7 2: same data, except: entrada da trilha Cores da Caatinga, Terra 3 station, light trap, 13.11.2020. -9.2135, -43.4665. J.M.S. Rodrigues col., CEIOC 81994; 1 3,2 ©: same data, except: cruzamento entre as estradas Santa Luz e Viana, Terra 8 station, light trap, 14.11.2020. -9.3845, -43.8064. J.S. Prando col., CEIOC 82028; 3 3, 2 9: same data, except: A.A. Alves col., CEIOC 82040; 2 3: same data, except: Sao Braz municipality, estrada do Parque, Terra 11 station, light trap, 15.11.2020, -8.8451, -43.1847. J.M.S. Rodrigues col., CEIOC 81987; 1 3: same data, except: CEIOC 82026; 2 3, 1 2: same data, except: estrada do Parque, proximo a clareira de gado, Terra 14 station, light trap, 16.11.2020. -9.212, -43.5195, CEIOC 81992. !ISE, 2018: 1 4, 11 2, 4 nymphs: Canhoba mu- nicipality, agude, SE1 station, 07.VII.2018. -10.1287, -36.9698. C.F.B. Floriano, J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81612; 3 4: same data, except: Estancia municipality, RBSI, Complexo de Dunas da Praia do Saco, REBIOSI17 station, 05.V.2018. -11.4190, -37.3223. C.F.B. Floriano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81619; 3 3, 1 9: same data, except: CEIOC 81617. Same state, 2019: 7 3, 3 9: same data, except: Canindé de Sao Fran- cisco municipality, agude, ALSE22 station, 301 m, 26.V.2019. -9.8549, -37.9391. J.M.S. Rodrigues, W. Souza & F.F.F. Moreira cols., CEIOC 82074; 7 ¢, 5 2: same data, except: area alagada, Riacho do Boqueirao, ALSE23 station, 280 m, -9.9096, -37.8837, CEIOC 82067. Buenoa unguis Truxal, 1953 Fig. 10L Buenoa unguis Truxal, 1953: 1476-1479, fig. 78 [original description]. Diagnosis. Medium to large species, male length 5.9-7.1 mm. Synthlipsis nar- row, 1/6 to 1/5 of vertex width. Tylus flat-sulcate. Labial prong distinctly shorter than third labial article, originating proximally on article. Fore femur apex nar- rowed, without stridulatory area. Fore tarsus robust and dilated, with orthogo- nal-angulated claws. Distribution. Argentina (Truxal 1953). Bolivia (Truxal 1953). Brazil: AL [new record], AM (Rico et al. 2010; Barbosa and Nessimian 201 3a), CE (Truxal 1953; Barbosa et al. 2010c; this work), MG (Truxal 1953; Nieser and Melo 1997; Melo and Nieser 2004; Barbosa et al. 2010c), PA (Truxal 1953; Andrade 1992; Bar- bosa and Nessimian 2013a), PB (Truxal 1953), PE (Truxal 1953; this work), PI (Takiya et al. 2016; this work), RJ (Truxal 1953; Barbosa et al. 2010c), RN (Trux- al 1953), SE [new record], SP (Castanhole et al. 2013; Pereira et al. 2015a), TO (Truxal 1957). Paraguay (Truxal 1953). Peru (Truxal 1953). Venezuela (Herrera 2005). ZooKkeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 263 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Material examined. BRAZIL, !AL, 2018: 2 3, 2 9: Piagabucu municipality, APAP, APAP4 station, 02.V.2018. -10.3252, -36.3506. C.F.B. Floriano, J.M.S. Ro- drigues & O.M. Magalhaes cols., CEIOC 81687. Same state, 2019: 4 3: same data, except: Marimbondo municipality, Flexeiras, agude, ALSE11 station, 122 m, -9.5074, -36.2340. J.M.S. Rodrigues, W. Souza & F.F.F. Moreira col., CEIOC 82047. CE, 2019: 3 4: Aiuaba municipality, EEA, Sitio do Martins, casa da game- leira, Agua 1 station, 532 m, 09.IV.2019. -6.6992, -40.2908. J.M.S. Rodrigues col., CEIOC 81945; 1 4: same data, except: Sitio Volta de Cima, Sede do ICM- BIO, poco, Agua 6 station, 455 m, 10.IV.2019. -6.6019, -40.1248, CEIOC 82010; 9 3,5 Q: same data, except: Vaginha da Gameleira, acude, Agua 9 station, 510 m, 12.1V.2019, -6.6866, -40.2625, CEIOC 81953; 1 4: same data, except: acude do Letreiro, Agua 12 station, 475 m, 13.1V.2019. -6.6163, -40.1545, CZMA; 1 <, 2 2: same data, except: Sitio Volta de Baixo, Terra 12 station, light trap, 441 m, 14.1V.2019. -6.6254, -40.1336, CEIOC 81950. Same state, 2021: 1 3, 7 9: same data, except: Sitio Jatoba, acude, Agua 1 station, 571 m, 06.VI.2021. -6.7351, -40.2424. J.M.S. Rodrigues col., CZMA; 1 4, 7 2: same data, except: Sitio Volta de Cima, lago, Agua 4 station, 434 m, 05.VI.2021. -6.6019, -40.1246, CZMA; 10 3, 4 2: same data, except: brejo, Agua 6 station, 570 m, -6.7263, -40.2229. J.M.S. Rodrigues & F.F.F Moreira cols., CEIOC 81954; 8 ¢, 12 9: same data, except: braco de rio, acude, Agua 11 station, 513 m, 07.VI.2021. -6.6997, -40.1917, CEIOC 81952; 2 3, 1 2: same data, except: brejo, Agua 12 station, 584 m, -6.7384, -40.2475, CZMA; 1 3: same data, except: estrada, Terra 3 station, light trap, 505 m, -6.6974, -40.2819. C.C. Gongalves col., CZMA; 1 4: same data, except: estrada, Terra 5 station, light trap, 493 m, 03.VI.2021. -6.7003, -40.1919. J.M.S. Rodrigues col., CZMA; 2 3, 4 9: same data, except: estrada prox. ao riacho, Terra 16 station, light trap, 498 m, 06.V1I.2021. -6.6871, -40.2683, CEIOC 81951. PE, 2019: 3 3: Buique municipality, PNCA, riacho salgado do inicio da trilha para o Sitio arqueolégico Alcobaca, pocas temporarias, Agua 6 station, 670 m, 15.1I1.2019. -8.5261, -37.1938. H. Rodrigues & J.M.S. Rodrigues cols., CEIOC 82062; 1 3, 4 2: same data, except: Tupanatinga municipality, brejo, perto da sede, poca temporaria, Fazenda Brejo de Sao José, Agua 7 station, 699 m, 16.1II.2019. -8.5372, -37.2200, CZMA; 3 3: same data, except: riacho temporéario, Fazenda Jua, Agua 12 station, 548 m, 17.III.2019. -8.4350, -37.3467, CEIOC 82055; 4 4, 2 9: same data, except: Igrejinha, Barragem de Valdira, 853 m, Agua 16 station, -8.4902, -37.2465, CEIOC 82052; 1 3: same data, ex- cept: Chapad4o, poca temporaria, 957 m, Agua 18 station, 20.1II.2019. -8.5244, -37.2394, CZMA; 2 <: same data, except: J.M.S. Rodrigues col., CEIOC 82061; 2 3S: same data, except: H. Rodrigues col., CEIOC 82060; 3 4, 8 2, 1 nymph: same data, except: Fazenda do brejo, Terra 7 station, light trap, 706 m, 16.II1.2019. -8.5199, -37.2249, J.M.S. Rodrigues col., CEIOC 82053; 3 3: same data, except: C.C. Goncalves col., CEIOC 82048; 4 3, 6 2: same data, except: H. Rodrigues col., CEIOC 82044; 2 4, 3 9: same data, except: estrada do gado, Terra 14 sta- tion, light trap, 663 m, 19.III.2019. -8.4866, -37.3404. H. Rodrigues col., CZMA; 14 4, 32 2: same data, except: J.M.S. Rodrigues col., CEIOC 82056; 2 3: same data, except: Fazenda Laranjeiras, Terra 18 station, light trap, 610 m, 20.111.2019. -8.5244, -37.2394, CEIOC 82051. Same state, 2021: 2 3’, 1 9: same data, except: Tupanatinga municipality, Barro branco, Comunidade Muquém, acudes, Agua 1 station, 824 m, 110.111.2021. -8.5001, -37.3113. J.M.S. Rodrigues & R. Jordao ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 264 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil cols., CEIOC 81947; 2 4, 3 9: same data, except: poca ao lado da estrada, Agua 2 station, 904 m, -8.4982, -37.2852, CEIOC 81948; 1 4, 1 9: same data, except: Chapadao, acude, Agua 3 station, 940 m, 12.11.2021. -8.5244, -37.2394, CZMA; 2 5, 4 nymphs: same data, except: caldeiré6es em rocha, ao lado de estrada de chao perto da Igrejinha, Agua 6 station, 13.1II.2021. -8.5024, -37.2543, CZMA; 1 3: same data, except: Serrinha, caldeirées em rocha, Agua 7 station, 924 m, -8.5188, -37.2337, CZMA; 5 3, 4 2: same data, except: Buique municipality, Ser- ra do Catimbau, acudes, Agua 9 station, 976 m, 14.III.2021. -8.5791, -37.2147, CEIOC 81949; 3 4,3 2: same data, except: Fazenda Brejo Sao José, brejo, bebe- douro de cabras, Agua 13 station, 673 m, 16.III.2021. -8.5247, -37.1968, CZMA. Pl, 2018: 3 3: PNSC, acude, Agua 6 station, 512 m, 11.XII.2018. -9.213083, -43.498444, CEIOC 82063; 5 3, 7 nymphs: same data, except: Guaribas mu- nicipality, agude, Agua 10 station, 640 m, 14.XII.2018. -9.364889, -43.754583, CEIOC 82049; 1 3, 2 2: same data, except: Caracol municipality, acude, Agua 12 station, 498 m, 14.XII.2018. 9.2109, -43.5201, CEIOC 82050; 1 4, 1 9: Caracol municipality, PNSC, entre o mirante “Janela do Sertao” e o cemitério, Terra 2 station, light trap, 566 m, 10.XII.2018. -9.2188, -43.4902. J.S. Prando col., CEIOC 82046; 16 4: Caracol municipality, PNSC, proximo a estrada, Terra 6 station, light trap, 11.XII.2018. -9.2137, -43.4986. J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 82059; 1 4, 2 9: same data, except: J.S. Prando col., CZMA; 57 3, 110 9: same data, except: C.C. Goncalves col., CEIOC 82045; 23 4: same data, except: proximo a estrada, Terra 8 station, light trap, 12.XII.2018. -9.2149, -43.5036. C.C. Goncalves col., CEIOC 82058; 4 4: same data, except: J.M.S Rodrigues col., CZMA; 1 4: same data, except: Jurema municipality, casa do sucumbido, Sede do Parque, Terra 11 station, 562 m, 13.XII.2018. -8.8597, -43.1817, CEIOC 82054; 1 4, 1 2: same data, except: ao lado da estrada, em rio seco, Terra 15 station, light trap, 15.11.2018. -9.2137, -43.5000. J.M.S. Rodrigues & O.M. Magalhaes cols., CZMA. same state, 2020: 1 4’, 1 2: Guaribas municipal- ity, PNSC, pocas na estrada para Santa Luz, Agua 5 station, 685 m, 14.11.2020. -9.376, -43.7914. J.M.S. Rodrigues & I.R.S. Cordeiro cols., CZMA; 2 ¢: same data, except: Jurema municipality, Sucumbido, caldeiré6es, Agua 7 station, 549 m, 15.11.2020. -8.8792, -43.1658, CEIOC 82009; 3 3, 4 9: same data, except: area alagada perto da estrada, Agua 8 station, 562 m, -8.8719, -43.1771, CEIOC 81946; 3 4, 16 2: same data, except Caracol municipality, povoado Sobrado, al- agado em area de pasto, Agua 11 station, 499 m, 16.11.2020. -9.2111, -43.5202, CZMA; 2 2,7 2: same data, except: Guaribas municipality, BrejAo, agude, Agua 12 station, 640 m, 18.11.2020. -9.3650, -43.7544, CZMA; 12 3’, 18 2: same data, except: Bom Jesus municipality, Viana, pocas em estrada de terra, Agua 13 sta- tion, 396 m, -9.4484, -43.0743, CEIOC 82008; 1 <4: same data, except: Sao Braz municipality, estrada do Parque, Terra 11 station, light trap, 15.11.2020. -8.8451, -43.1847. J.M.S. Rodrigues col., CZMA; 1 3, 1 2: same data, except: Caracol municipality, estrada do parque, proximo a clareira de gado, Terra 14 station, light trap, 16.11.2020. -9.212, -43.5195. J.S. Prando col., CZMA. !SE, 2018: 3 3’, 20 9: Japaratuba municipality, Estrada BR-101, poga, REBIOSI8 station, 03.V.2018. -10.5476, -36.9698. C.F.B. Floriano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81623. Same state, 2019: 6 4, 13 9: Canindé de Sao Francisco munici- pality, agude, ALSE22 station, 301 m, 26.V.2019. -9.8549, -37.9391. J.M.S. Ro- drigues, W. Souza & F.F.F. Moreira cols., CEIOC 82057. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 265 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Subfamily Notonectinae Tribe Notonectini Notonecta Linnaeus, 1758 Notonecta (Paranecta) disturbata Hungerford, 1926 Fig. 10M Notonecta disturbata Hungerford, 1926: 13, 14, fig. 2 [original description]. Notonecta (Paranecta) disturbata; Hutchinson (1929): 363 [subgenus placement]. Diagnosis. Medium-sized, ~ 8 mm long. Vertex/synthlipsis ratio ~ 2.7. Later- al margins of pronotum straight and divergent. Genital capsule with two cau- doventral protuberances; apex of paramere not bifurcated (Fig. 8A). Taxonomic notes. It is most similar to N. pulchra Hungerford, 1926, which has the same size. Examination of the male genital capsule is needed to ensure correct identification in most species of this genus, and N. disturba- ta is no exception. In this species, the genital capsule has two caudoventral protuberances, and dorsal portion is acute (Fig. 8A), opposing to N. pulchra, which has only one protuberance and the dorsal portion of the genital capsule rounded (Fig. 8B). Distribution. Argentina (Bachmann 1963). Brazil: AL [new record], CE [new record], ES (Bachmann 1963), GO (Truxal 1957), MG (Melo and Nieser 2004; Barbosa and Nessimian 2013b), MT (Nieser 1970), PA (Barbosa and Nessimian 2013b; Nobre et al. 2019), PE [new record], PI (Barbosa and Nessimian 2013b; Takiya et al. 2016), RJ (Hungerford 1926, 1933; Ribeiro et al. 1998, 2010; Bar- bosa and Nessimian 2013b), RS (Bachmann 1963; Barbosa and Nessimian 2013b), SE [new record], SP (Barbosa and Nessimian 2013b), TO (Truxal 1957). Paraguay (Hungerford 1933). Material examined. BRAZIL, !AL, 2018: 1 3, 1 9: Quebrangulo municipality, RBPT, Sitio Juliana, brejo, PPT4 station, 04.VII.2018. -9.2608, -36.4157. C.F.B. Flo- riano, J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81679. Same state, 2019: 1 <3, 2 2: same data, except: Minador do Negrao municipality, agude, ALSE13 station, 253 m, 23.V.2019. -9.3679, -36.8425. J.M.S. Rodrigues, W. Souza & F.F.F. Morei- ra cols., CEIOC 82013; 3 3, 2 adults: same data, except: Maravilha municipality, rodovia BR-316, acude, ALSE15, 294 m, 24.V.2019, CEIOC 82014. ICE, 2019: 2 2: Aiuaba municipality, EEA, area alagada ao lado da estrada para a casa do Cajue- iro, Agua 4 station, 508 m, 10.IV.2019. -6.6923, -40.1873. J.M.S. Rodrigues col., CEIOC 81941; 1 3: same data, except: sitio Boa Vista, 4rea alagada, Agua 7 sta- tion, 570 m, 11.IV.2019. -6.7255, -40.2226, CEIOC 81943. Same state, 2021: 1 3,2 2: same data, except: brejo, Agua 6 station, 570 m, 05.VI.2021. -6.7263, -40.2229. J.M.S. Rodrigues & F.F.F Moreira cols., CEIOC 81944. !PE, 2019: 1 4: Tupanatinga municipality, PNCA, Fazenda Brejo de Sao José, poca temporaria, Agua 8 sta- tion, 700 m, 16.1I1.2019. -8.506, -37.2237. H. Rodrigues & J.M.S. Rodrigues cols., CEIOC 82015; 2 4, 1 2: same data, except: Chapadao, poca temporaria, Agua 18 station, 957 m, 20.1I1.2019. -8.5244, -37.2394, CEIOC 81942. !SE, 2018: 1 3: Areia Branca municipality, PNSI, Riacho Negro, PNSI2 station, 08.VII.2018. -10.7475, -37.3402. C.F.B. Floriano, J.F. Barbosa J.M.S Rodrigues cols., CEIOC 81674; 2 3, 2 ©, 1 nymph: Lagarto municipality, Estrada SE-170, acude, 09.VII.2018. [-10.91319, -37.67136]. C.F.B. Floriano, J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81661. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 266 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Same state, 2019: 5 4, 3 2: same data, except: Canindé de Sao Francisco mu- nicipality, agude, ALSE22 station, 301 m, 26.V.2019. -9.8549, -37.9391. J.M.S. Ro- drigues, W. Souza & F.F.F. Moreira cols., CEIOC 81940. Enitharoides Brooks, 1953 Enitharoides brasiliensis (Spinola, 1837) Fig. 10N Enithares brasiliensis Spinola, 1837: 60 [original description]. Notonecta grandis Germar in Herrich-Schaffer, 1849: 42, fig. 901 [synonym; Kirkaldy (1904): 101]. Bothronotus brasiliensis; Fieber (1852): 472 [unnecessary generic replace- ment name]. Enithares (Enitharoides) brasiliensis; Brooks (1953): 74, 75, figs A, D [sub- genus placement]. Enitharoides brasiliensis; Stys and Riha (1975): 166 [genus transfer]. Diagnosis. Male length 15-16 mm. Wide rectangular punctuated area on scute- lum. Middle femur with short and dark pubescence; anteapical protuberance weakly developed. Apex of metaxyphus variable, acute to spatulated. Taxonomic notes. This species shows some variation in general and heme- lytral color pattern, from light-yellow to dark brown, with deep punctures on the scutellum. The amount of these punctures seems to follow the overall color of the specimens. It resembles E. lanemeloi Barbosa, Ribeiro & Nessimian, 2017, as both species show middle femur with short setae and poorly developed apical spur, but can be distinguished from it by the coarser aspect and different pattern of the scutellar punctures, the different pattern of the punctuated area on the scutellum, and by differences in paramere shape. Differences between E. brasiliensis and the other species occurring in the study area, E. tricomerus, are provided in the key. Distribution. Brazil: BA [new record], ES (Kirkaldy 1904), MG (Kirkaldy 1904; Nieser and Melo 1997; Goulart et al. 2002; Vianna and Melo 2003; Pelli et al. 2006; Souza et al. 2006; Barbosa et al. 2017), RU (Henriques-Oliveira and Nes- simian 2010; Ribeiro et al. 2010; Cordeiro and Moreira 2015; Barbosa et al. 2017), SP (Barbosa et al. 2017). Material examined. BRAZIL, BA, 2021: 1 <, 2 adults, 1 nymph: Mucugé mu- nicipality, PNCD, rio pr6éximo ao Mirante do Cachoeirado, Agua 10 station, 1191 m, 19.V.2021. -12.8110, -41.4429. J.M.S. Rodrigues col., CEIOC 81956. Enitharoides tricomerus Barbosa, Ribeiro & Nessimian, 2017 Fig. 100 Enitharoides tricomerus Barbosa, Ribeiro & Nessimian, 2017: 480, 482, figs 49-61 [original description]. Diagnosis. Male length 15.3-16.8 mm. Deeply punctuated area widely distrib- uted on scutellum. Middle femur with long pubescence and robust anteapical protuberance. Apex of metaxyphus triangular. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 267 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Taxonomic notes. This species shows conspicuous long brown setae and a well-developed anteapical spur on the middle femur. These features are pres- ent in another species, E. /ucasduquei Barbosa, Ribeiro & Nessimian, 2017, but the latter has a triangular-shaped spur on the middle femur and a different pattern of scutellar punctures. Also, the middle femur of E. lucasduquei bears shorter setae restricted to the apical half of the segment, and shows a less dense pubescence aspect. Distribution. Brazil: AL [new record], ES (Barbosa et al. 2017), MG (Barbosa et al. 2017). Material examined. BRAZIL, !AL, 2018: 1 4: Murici municipality, EEM, EEM4 station, 28.IV.2018. -9.2540, -35.8010. C.F.B. Floriano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81659. Same state, 2019: 2 4, 1 9, 2 nymphs: same data, except: Vale do Socorro, rlacho sem nome em area de dendé, ALSE6 sta- tion, 22.V.2019. -9.2386, -35.8649. J.M.S. Rodrigues, W. Souza & F.F.F. Moreira cols., CEIOC 82016; 4 4, 3 2, 1 nymph: same data, except: Fazenda Bananeira, riacho, ALSE9 station, -9.2193, -35.8789, CEIOC 82017. Tribe Nychiini Martarega White, 1879 Martarega bentoi Truxal, 1949 Fig. 10PR Q Martarega bentoi Truxal, 1949: 22, 23, figs 7, 8 [original description]. Diagnosis. Male length 5.2-5.3 mm. Ocular commissure > 1/3 of eye width. Scute- llum with hyaline apex; ventral surface of middle trochanter with a group of en- siform bristles. Hemelytra of brachypterous specimens with medial longitudinal hyaline stripe wide, tapering from base of hemelytra up to coastal margin in mem- brane suture; wide range of hemelytral process stripe, 25% up to 40% of hemely- tral length; hemelytral process shorter than membrane length (Fig. 9A). Taxonomic notes. Martarega bentoi is a medium-sized species that is very com- mon and widespread in Brazil. It is very similar to M. uruguayensis (Berg, 1883), but can be distinguished from it after examination of the hyaline band on the hemel- ytra of coleopteroid specimens (Fig. 9A), or the different position of the ensiform bristles on the middle trochanter. Also, it differs from Martarega brasiliensis and M. membranacea, the other two species found in this survey, by the combination of a scutellum with a hyaline apex and the middle trochanter with ensiform bristles. Distribution. Argentina (Mazzucconi 2008). Brazil: AL [new record], BA (Moreira et al. 2016; this work), CE (Takiya et al. 2016; this work), GO (Barbosa and Dias-Silva 2017), MG (Barbosa and Rodrigues 2013; Gutiérrez et al. 2017b; Novais et al. 2017), MT (Barbosa and Giehl 2014), PE (Truxal 1949, this work), PI (Barbosa and Rodrigues 2013), RJ (Cordeiro and Moreira 2015), SE [new record]. Material examined. BRAZIL, !AL, 2018: 1 4: Murici municipality, EEM, EEM5 station 28.IV.2018. -9.2540, -35.8010. C.F.B. Floriano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81654; 1 3’, 1 2: Maragogi municipality, APACC, APACC2 station, 29.IV.2018. -8.9220, -35.1795, CEIOC 81656; 10 4, 4 9, 5 nymphs: same data, except: APACC3 station, -8.9307, -35.2105, CEIOC 81678; 8 3, 8 2, 5 nymphs: Coité do Ndia municipality, Taquarana, queda d’agua, AL4 ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 268 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil station, 06.VII.2018. -9.6723, -36.4987. C.F.B. Floriano, J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81657; 1 3: Campo Grande municipality, agude, AL7 sta- tion, 07.VII.2018. -9.9559, -36.8373, CEIOC 81668. Same state, 2019: 4 2, 4 9, 9 nymphs: same data, except: Uniao dos Palmares, municipality, Rio Mundau, ALSE1 station, 21.V.2019. -9.1342, -36.0809. J.M.S. Rodrigues, H. Rodrigues, W. Souza, F.F.F. Moreira cols., CEIOC 82083; 4 3, 4 9: same data, except: Santana do Mundau municipality, rio na estrada AL-205, ALSE2 station, -9.1464, -36.2430, CEIOC 82081; 16 3, 6 , 1 nymph: same data, except: Vicosa municipality, Fa- zenda da Baixa Funda, riacho, ALSE3 station, -9,3243, -36.2830, CEIOC 82085; 7 3,4 2, 2 nymphs: same data, except: Murici municipality, EEM, Vale do Socorro, Cachoeira do Socorro, ALSE5 station, 361 m, 22.V.2019. -9.236, -35.8609, CEIOC 82084; BA, 2018: 4 3, 3 nymphs: Mucugé municipality, PNCD, Agua 2 station, 19.VIII.2018. -13.0004, -41.3982. J.M.S. Rodrigues & F.F.F Moreira cols., CZMA; 8 3,2 2, 40 nymphs: same data, except: Agua 3 station, -12.9908, -41.3507, CE- IOC 81931; 4 3, 8 2, 12 nymphs: same data, except: Andarai municipality, Agua 5 station, 20.VIII.2018. -12.9002, -41.3249, CZMA; 6 <, 2 2, 5 nymphs: same data, except: Agua 6 station, -12.8401, -41.3235, CEIOC 81928; 1 2, 4 nymphs: same data, except: Mucugé municipality, Agua 7 station, 21.VIII.2018. -13.0174, -41.3441, CZMA; 1 4, 2 2, 4 nymphs: same data, except: Len¢cdis municipality, Agua 9 station, 22.VIII.2018. -12.5865, -41.3822, CZMA; 1 3, 2 2: same data, except: Agua 10 station, -12.6008, -41.3811, CZMA; 3 4, 4 nymphs: same data, except: Mucugé municipality, Agua 11 station, 23.VIII.2018. -13.2932, -41.2414, CZMA; 1 3,5 2, 1 nymph: same data, except: Agua 12 station, -13.2886, -41.2646, CEIOC 81925. Same state, 2021: 6 3, 6 2, 1 nymph: same data, except: Palmei- ras municipality, Rio Preto, Agua 1 station, 820 m, 05.V.2021. -12.6036, -41.5250. J.M.S. Rodrigues & J.F. Barbosa cols., CEIOC 81927; 2 3, 3 2, 5 nymphs: same data, except: Mucugé municipality, Cachoeira Véu da Noiva, Agua 2 station, 776 m, 06.V.2021. -13.2881, -41.2683, CZMA; 19 3, 6 2, 1 nymph: same data, ex- cept: Itaeté municipality, Rio Timbé, Agua 3 station, 428 m, 07.V.2021. -12.6036, -41.5250, CEIOC 81930; 1 4 (macropterous): same data, except: CEIOC 81926; 3 3,4 2: same data, except: Rio Samina, Agua 4 station, 413 m, -13.1105, -41.1587, CZMA; 2 4, 3 2: same data, except: Andara/ municipality, Rio Garapa, Agua 5 sta- tion, 330 m, 08.V.2021. -12.7456, -41.3454, CZMA; 6 2,2 2, 2 nymphs: same data, except: Lencdis municipality, Rio Capivara, Agua 8 station, 405 m, 09.V.2021. -12.6232, -41.3763, CZMA; 1 41 2: same data, except: Mucugé municipality, Rio Preto, Agua 9 station, 1249 m, 10.V.2021. -12.7978, -41.4835, CZMA; 1 & (mac- ropterous): same data, except: Cachoeira da Moca Loira, Agua 11 station, 724 m, -12.7978, -41.4835, CEIOC 81929; 8 3,3 2: same data, except: CEIOC 81924; 2 4, 3 2: same data, except: Mucugé, Rio Una, Agua 12 station, 11.V.2021. -13.2921, -41.2524, CEIOC 82020. CE, 2021: 1 4, 1 2 (both macropterous), 1 nymph: Aiua- ba municipality, EEA, brejo, Agua 2 station, 489 m, 04.V1.2021. -6.6850, -40.1841, CEIOC 82018. PE, 2019: 15 3, 16 2: Tupanatinga municipality, PNCA, Riacho de Leis, pocas temporarias ao longo do leito, Agua 14 station, 750 m, 18.III.2019. -8.5829, -37.2445. J.M.S. Rodrigues & H. Rodrigues cols., CEIOC 82019. !SE, 2018: 12 3, 2 9: Areia Branca municipality, PNSI, Riacho Negro, PNSI2 station, 08.VII.2018. -10.7475, -37.3402, C.F.B. Floriano, J.F. Barbosa, J.M.S. Rodrigues cols., CEIOC 81655; 14 3, 4 9: same data, except: Riacho Vermelho, PNSI1 sta- tion, -10.7387, -37.33547, CEIOC 81675; 4 4, 5 9, 12 nymphs: Japoata municipal- ity, Estrada SE-335, RebioSI!7 station, 03.V.2018. -10.3679, -36.8074. C.F.B. Floria- ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 269 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil no, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81667; 3 3, 2 2, 3 nymphs: Sao Cristovao municipality, Rio Pitanga, RebioSI11 station, 04.V.2018. -10.9633, -37.1663, CEIOC 81669; 11 4, 8 2, 7 nymphs: same data, except: Estrada Rita Cacete, RebioSI12 station, -10.9851, -37.2868, CEIOC 81677. Martarega brasiliensis Truxal, 1949 Fig. 10R Martarega brasiliensis Truxal, 1949: 16, figs 3, 4 [original description]. Diagnosis. Medium-sized species, male length 5.2-5.4 mm. Ocular commis- sure 1/2 of eye width. Ventral surface of third labial article pubescent. Scutel- lum with hyaline apex. Fore femur with a short spiniform seta. Ventral surface of middle trochanter with a patch of thin setae. Hemelytra of brachypterous specimens with medial longitudinal hyaline stripe narrow, slightly tapering from base of hemelytra up to membrane suture; hemelytral process stripe short, 20- 30% of hemelytral length; hemelytral process slightly shorter than membrane length (Fig. 9B). Taxonomic notes. Martarega brasiliensis is slightly larger than M. nessimiani Barbosa & Rodrigues, 2013, a species with which it shares some similarities. Martarega brasiliensis has some distinctive features, like the pubescent labial surface and differences in the width of the hyaline band of the hemelytra. Distribution. Brazil: AL [new record], CE (Truxal 1949; this work), GO (Barbosa and Dias-Silva 2017), MS (Floriano et al. 2013), MT (Barbosa and Giehl 2014), PA (Nieser 1970; Barbosa et al. 2010b, 2012), PE (Truxal 1949), RJ (Ribeiro et al. 2010), RR (Barbosa et al. 2012; Barbosa and Rodrigues 2013), SP (Castan- hole et al. 2013; Pereira et al. 2015a, 2015b). Colombia (Padilla-Gil 2014). Peru (Truxal 1949). Suriname (Nieser 1968). Material examined. BRAZIL, !AL, 2018: 2 4, 16 2, 4 nymphs: Jequia da Praia municipality, RESEX, Mutuca, RJ3 station, 30.IV.2018. -9.9446, -36.0846. C.F.B. Floriano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81663; 2 4, 6 9: same data, except: RJ4 station, -9.9502, -36.0859, CEIOC 81660. CE, 2019: 1 4: Aiuaba municipality, EEA, Sitio Volta de Cima, sede do ICMBIO, poco, Agua 6 station, 455 m, 10.1V.2019. -6.6019, -40.1248. J.M.S. Rodrigues col., CEIOC 81932; 1 J: same data, except: Sitio Volta de cima, sede do ICMBIO, Terra 4 station, light trap, 460 m, -6.6025, -40.1286. J.S. Prando col., CZMA; 1 3: same data, except: Sitio Boa Vista, Terra 6 station, Light trap, 583 m, 13.IV.2019. -6.6025, -40.1286. V. Quintas col., CEIOC 81957; 1 4: same data, except: J.S. Prando col., CEIOC 81933. Martarega membranacea White, 1879 Fig. 10S Martarega membranacea White 1879: 272 [original description]. Diagnosis. Small species, male length 4.1—4.2 mm. Ocular commissure longer than 1/2 of eye width. Scutellum with 1/2 of its length hyaline. Ventral surface of middle ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 270 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil trochanter smooth. Hemelytra of brachypterous specimens with claval commis- sure expanded, hyaline, reaching the anterior margin of membrane; medial longitu- dinal hyaline stripe very wide, sinuous, with same width from base of hemelytra up to coastal margin in membrane suture; hemelytral process stripe large, 20-30% of hemelytral length; hemelytral process slightly longer than membrane length (Fig. 9C) Taxonomic notes. This species can be distinguished from M. chinai Hynes, 1948, the most similar congener, by the longer posterior hemelytral process and by the absence of a pubescent nodule on the middle trochanter. Distribution. Argentina (L6pez-Ruf et al. 2003). Bolivia (Truxal 1949). Brazil: AM (White 1879; Truxal 1949; Nieser 1970; Pereira and Melo 2007; Barbosa et al. 2012; Barbosa and Rodrigues 2013), BA [new record], GO (Nieser 1970; Bar- bosa and Dias-Silva 2017), MG (Melo and Nieser 2004; Barbosa and Rodrigues 2013), MS (Floriano et al. 2013), MT (Barbosa and Giehl 2014), PA (Truxal 1949; Nieser 1970; Andrade 1992; Barbosa et al. 2012), RU (Ribeiro et al. 2010), RO (Truxal 1949), SE [new record], SP (Castanhole et al. 2013; Pereira et al. 2015a), TO (Truxal 1957). Colombia (Roback and Nieser 1974). Ecuador (Kirkaldy 1899c). Guyana (Truxal 1949). Suriname (Nieser 1968). Material examined. BRAZIL, !BA, 2018: 2 3, 11 9: Lencdis municipality, PNCD, Agua 10 station, 22.VIII.2018. -12.6008, -41.3811, J.M.S. Rodrigues & F.F.F Moreira cols., CEIOC 81934. !SE, 2018: 3 3, 3 2, 2 nymphs: Pirambu mu- nicipality, RBSI, RebioSI5, 01.V.2018. -10.6515, -36.7571. C.F.B. Floriano, J.M.S. Rodrigues & O.M. Magalhaes cols., CEIOC 81662. Figure 9. Martarega, aspect of brachypterous male hemelytra, lateral view; hyaline portions are represented as undotted, modified from Barbosa 2014 A Martarega bentoi B M. brasiliensis C M. membranacea. Abbreviations: cc = claval commis- sure, hp = hemelytral process, hs = hemelytral process stripe, ms = medial longitudinal stripe. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 271 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil 272 ‘pa}LOIPU! aSIMJaY}O SSayUN ‘WWW | :sueg ajeOS ‘SuUaWIDeds SNoJa}dAYyoeIg ae § q ‘| ‘WB ‘SUaUIDadS SNOJa}dOJDeW aje Y-O ‘O-f ‘H-J ‘G-W ea2euesqwiaw ‘ § sisualjiseig WY lojuag ebasewie-W 0 d SNJQWOIL} "FO Sisualjisesg SapioseyUZ N &1eG/NISIP eJDaUOLON |W sinbun ‘g 7 sijesse) “g y SI1N/es ‘g fF SIjigejnwopnasd ‘g | SiwaudA}e/d ‘g H sedijjed'g9 sijigeinw “g 4 &]U0y ‘g A eUlOY ‘g q SluUadiosny “g 9 sI/esowas ‘g q SnuabiuWe eouang W SuaWUIOAads aye ‘ABAJNS S14} Ul pUNOJ Saldads jo snyiqey Jessop ‘Aep!OSUOJON ‘OL asnbi4 ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil 38.00 -37.50 -37.00 -36.50 -36.00 -35.50 -35.00 A Bamaivenns @ B. uaguis VY &. konia ©} E tricomerus D & pallipes ON disurbata &. salutis QM benroi & 2B. tarsalis O M brasiliensis [2MLAGOAS BBC anservation units AB. amnigenus J &. koina Vv &. konta AB. pseudomutabilis DB. salutis © B. tarsalis OE. brasiliensis QML bentol M. membranacea Epycp 0 5 10 km ee Figure 12. New records of Notonectidae species in Parque Nacional da Chapada Diamantina, Bahia State, Brazil. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 273 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil A B.amnigenus <4 B. unguis q 8. fuscipennis O WN. disturbata VW 2B. konta QM. bentoi & B. mutabilis @ M brasiliensis DB. salutis MBE EA > 8B. tarsalis [_ICEARA 2,5 & B. amnigenus (> 8B tarsalis &. tarsalis J B. unguis MPNSC (ria -38.50 -38.00 -37.50 -37.00 36.50 -36.00 YW 4B. konta QB. unguis A B. mutabilis O Nv disturbata A B. platyenemis QM. bentoi (> B. salutis > M. membranacea > B. tarsalis ME Conservation units -11.50 - [GSSERGIPE Figure 16. New records of Notonectidae species in Sergipe State, Brazil. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 275 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Figure 17. Aspects of some localities surveyed in Parque Nacional da Chapada Diamantina, Bahia State, Brazil, 2018 A Agua 1 station B Agua 2 station C Agua 3 station D Agua 8 station E Agua 6 station F Agua 4 station G Agua 7 station H Agua 5 station | Agua 11 station J Agua 9 station. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 276 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Figure 18. Aspects of some localities surveyed in Estacdo Ecolégica de Aiuaba, Ceara State, Brazil, 2019 A Agua 2 sta- tion B Agua 3 station C Agua 4 station D Agua 5 station E Agua 6 station F Agua 7 station G Agua 10 station H Agua 13 station. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 277 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Figure 19. Aspects of some localities surveyed in Parque Nacional do Catimbau, Pernambuco State, Brazil, 2019 A Agua 2 station B Agua 4 station C Agua 8 station D Agua 6 station E Agua 12 station F Agua 11 station G Agua 12 station H Agua 13 station. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 278 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Figure 20. Aspects of some localities surveyed in Parque Nacional da Serra das Confusoes, Piaui State, Brazil, 2018 A Agua 4 station B Agua 6 station C Agua 3 station D Agua 4 station E Agua 13 station F Agua 8 station G Agua 12 station H Agua 9 station | Agua 7 station J Agua 2 station K Agua 5 station L Agua 11 station. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 279 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Discussion General distribution of represented species In this Survey, approximately 1400 specimens from six of the nine states in northeastern Brazil have been examined, representing 18 (ca 31%) of the 58 species of the Notonectidae recorded from Brazil (Moreira et al. 2011; Ribeiro et al. 2022). Among the studied species, six (35%) are endemic from the coun- try and 15 (88%) are present only in South America (including Trinidad & Toba- go), with the exceptions of Buenoa mutabilis, B. platycnemis, and B. pallipes. This last species has a wide distribution, from Mexico to Paraguay, but had not been found in Brazil since the second half of the 20" century (Barbosa and Nessimian 2013a). Among the backswimmer species occurring in Brazil, only 12 had been previously recorded from the northeastern region of the country, a number that here is elevated to 18. The species firstly recorded from the region are Buenoa femoralis, B. fuscipennis, B. koina, B. konta, B. pallipes, Enitharoides brasiliensis, E. tricomerus, and Martarega membranacea. Our data show that the distribution range of Buenoa and Enitharoides species are wider and much more environmentally variable than what had been reported in the literature. Distribution of represented species in Brazilian biomes Of all species collected, only Buenoa salutis is present in all Brazilian biomes. Buenoa amnigenus, B. konta, and Notonecta disturbata are second in numbers of biomes occupied, the first two lacking records from the Pampa, and the last one, from the Pantanal. Many species found in this survey (10 spp., 55%) are present in other three Brazilian biomes, as shown in Table 1. This reinforces the already observed similarity of the biota found in the Caatinga with that present in adjacent biomes (Santos et al. 2007; Takiya et al. 2016; Rodrigues et al. 2021). Distribution of represented species in the conservation units studied The richest conservation unit was EEA (CE), with records of three genera and ten species, representing more than half (56%) of the surveyed diversity de- spite being the fifth in total area (MMA 2022). The least species-rich unit was RESEX, with only M. brasiliensis. The most frequent and abundant species in our samples was B. tarsalis, found in eight out of the eleven conservation units studied. Six species were found in only one unit each, namely Buenoa femor- alis, B. koina, B. platycnemis, B. pseudomutabilis, Enitharoides brasiliensis, and E. tricomerus (Table 2), three of which are found in PNCD. Nevertheless, some are relatively widespread in the country, showing that more surveys are needed in order to better understand the distribution of backswimmers in northeastern Brazil. Five species, B. amnigenus, B. platycnemis, B. tarsalis, Notonecta dis- turbata, and M. bentoi were found outside conservation units in Alagoas and Sergipe states. All of them were also found inside conservation units in these and/or other states as well. The results achieved in this work greatly improve the knowledge on the distribution of Notonectidae in Brazil, filling a gap of bio- diversity information for the northeastern states of the country. ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 280 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Table 1. Distribution of Notonectidae species based on their records in States. Normal font: previous records; bold font: new records; italic: same states, different localities. Biome Caatinga Atlantic Forest State AL AL RJ Anisopinae Notonectinae Fe SS Mo oF SS Oe Fe SB a a a dC Ce nse) PO (2 Pg 9 ee Fa SN | a a a [EEC I SB Ps a Ta aS) ee ER ee Pe SS a Ese ema i a a a a 2 ea Re ee PS de) we eles B. X X —— PP eee eee ee eal lear Fal PN Fae ge Pfc Bg 5 ep | "ae | ES a ca ee aoe | eae SE Sd De | a6 a ea S02 | a | ea | 2G cm eg ie Dg ied a eS Fea ES Pa ed See tee opto eet ee eae ett Ex" Pa PEER AES a eds na a a en ERS Roe PPE EE EEE EE EEE EEE EET Biome Amazon Forest Cerrado Savannah ‘Pantanal State MT MT TO aad Anisopinae Notonectinae “Barmigenss == fee ieee ee eet etree arecpome [= |-[-[¥[=1-|-1-l-1-1-1-1- 1-1-1 Ed Bins === Ke Ke Baas = == = pet l= fet ft peaee 1b PP Bpopemns == |XX === = R= == XK Bee EPL ssa pepe Peet pel Pepe Geew. [ain Jefe alee it otcle yet ene) A a ||| Sd SP | Se D2 mR Remained St =D Cel J Ls ai eile, [Pig he) 23 [bases [SB Pees cart] PRS [in [Poe iS Pee Efticamads Seu SSC URUaUaaa M. bentoi M. brasiliensis l= [= | - ear I x< Be ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 Pampas 281 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Table 2. Distribution of Notonectidae species by their presence in Conservation Units sampled in this work. A.F.: Atlantic Forest; C. Caatinga; C.S. Cerrado Savannah. State Conservation Unit Biome Subfamily Species Anisopinae | B.amnigenus B. femoralis B. fuscipennis B. koina B. konta B. mutabilis B. pallipes B. platycnemis B. pseudomutabilis B. salutis B. tarsalis B. unguis N. disturbata Notonectinae | E. brasiliensis E. tricomerus M. bentoi M. brasiliensis M. membranacea AL BA CE PE PI SE APACC APAP | EEM | RESEX | RBPT PNCD > EEA | PNCA_ PNSC _ PNSI RBSI A.F AF A.F AF A.F Cc Cc Cc C/C.S. | A.F/C A.F - - - - - X X X - ~ “ c = r E z * : - 5 : : e 7 a - : - - é E X - X - - X x - - X - : : 7 5 - 7 - 7 Z r i. 3 x 7 r ‘ Z - % rz x 7 7 : z : E z= : ¥ E : = : x M a F : : " i i E X X - - - X X - ~ X - X X - - X X X X X - X - X - - - - X X X - X - - - - X - X X - X - 7 a i : 7 " = z ’ a 3 . : . 7 : r 2 : r X - X - - X X X - X - r : ‘ x 7 ss * - 2 ‘ E - - - - - X - - - - X Acknowledgements We are grateful for the help provided by our colleagues during the fieldwork and for the support provided by the conservation units’ staff members. We are also grateful for the help provided by our colleagues during the fieldwork and for the support provided by the conservation units’ staffs. We would like to thank Dr. Higor Rodrigues and Dra. Silvia Mazzuconi for invaluable comments and con- tributions in reviewing the manuscript. Additional information Conflict of interest The authors have declared that no competing interests exist. Ethical statement No ethical statement was reported. Funding The material examined for this study was collected thanks to resources provided by the Conselho Nacional de Desenvolvimento Cientifico e Tecnoldgico (CNPq; #429936/2016- 8 and #421413/2017-4). Fieldwork was conducted with permits from the Sistema de Autorizacao e Informacao em Biodiversidade (SISBIO; #60275 and #62159). This study was financed in part by the Coordenacgao de Aperfeigoamento de Pessoal de Nivel ZooKeys 1233: 245-288 (2025), DOI: 10.3897/zookeys.1233.120598 282 Rafael Jordao et al.: Survey of Notonectidae from Northeastern Brazil Superior - Brasil (CAPES) - Finance Code 001. FFFM benefited from grants provided by the Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro (#E-26/201.362/2021 and #E-26/200.649/2023) and the CNPq (#301942/2019-6). Author contributions Writing - original draft: RJJ. Writing - review and editing: FFFM, JFFB. Author ORCIDs Rafael Jordao © https://orcid.org/0000-0002-0339-5293 Julianna Freires Barbosa © https://orcid.org/0000-0002-5276-194X Felipe Ferraz Figueiredo Moreira © https://orcid.org/0000-0002-6692-0323 Data availability All of the data that support the findings of this study are available in the main text. 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