ZooKeys 146: 1-17 (201 1) A peer-revi iewed open-access journa I

doi: 10.3897/zookeys. 146.1856 RESEARCH ARTICLE #Zookey

www.zookeys.o rg Launched to accelerate biodiversity research

Redescription of the rare amphipod crustacean
Pseudaeginella montoucheti (Quitete, 1971) from Brazil

Mariana Baptista Lacerda!, Ichiro Takeuchi?, Setuko Masunari!
p

| Postgraduate Program in Zoology, Federal University of Parand. Centro Politécnico, Jardim das Américas,
Caixa Postal 19020, CEP 81.531—970 — Curitiba, Parand, Brazil 2. Department of Life Environment Con-
servation, Faculty of Agriculture, Ehime University3—5-7 Tarumi, Matsuyama 790-8566, Japan

Corresponding author: Mariana Baptista Lacerda (lacerdamariana@yahoo.com.br)

Academic editor: A. Myers | Received 27 July 2011 | Accepted 27 October 2011 | Published 9 November 2011

Citation: Lacerda MB, Takeuchi I, Masunari S (2011) Redescription of the rare amphipod crustacean Pseudaeginella
montoucheti (Quitete, 1971) from Brazil. ZooKeys 146: 1-17. doi: 10.3897/zookeys. 146.1856

Abstract

Pseudaeginella montoucheti (Quitete, 1971) is redescribed based on newly collected specimens from red
and brown algae and tubiculous polychaete colony that were obtained from shallow waters at Tamboretes
Archipelago, Balnedrio Barra do Sul and Sepultura Beach, Bombinhas, Santa Catarina State, Brazil. Of
10 species of Pseudaeginella so far reported, P montoucheti is closest to P sanctipauli Laubitz, 1995, but
differs from the latter by having more numerous body spines including ventro-lateral ones over gills on
pereonites 3 and 4, and the antenna | length measuring half body length. An identification key for Pseu-

daeginella species and a checklist of Caprellidea occurring along the Brazilian coasts are also presented.

Keywords
Amphipoda, Pseudaeginella montoucheti (Quitete, 1971), Redescription, Santa Catarina, Brazil

Introduction

The knowledge on ecology and biology of Brazilian caprellids is restricted to some areas
and substrata, mainly those living on macroalgae from southeastern and southern coast
(Masunari 1982; Dutra 1988; Arenzon and Bond-Buckup 1991; Wakabara et al. 1991;
Dubiaski-Silva and Masunari 1995; Mittmann and Miiller 1998; Jacobucci et al. 2002;
Jacobucci et al. 2006; Leite et al. 2007; Dubiaski-Silva and Masunari 2008). In the same
way, taxonomic studies about Brazilian caprellids are also limited to few descriptions of new
species (McCain 1968; Quitete 197 1a, b, 1972; Serejo 1998; Guerra-Garcia 2003a; Rayol
and Serejo 2003) and two redescriptions (Serejo 1997; Masunari and Takeuchi 2006).

Copyright M.B. Lacerda et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which
permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

2 Mariana Baptista Lacerda et al. / ZooKeys 146: I-17 (2011)

Of 19 species of caprellids so far recorded from Brazilian coasts (Table 1), Pseudae-
ginella montoucheti was firstly described as Fallotritella montoucheti Quitete, 1971 (Quitete
1971a), based on specimens collected from Pernambuco State, northeastern Brazil. In
the middle of 1990's, Laubitz (1995) synonymed the genus Fallotritella with the genus
Pseudaeginella, \eading to change subsequently into Pseudaeginella montoucheti (Quitete,
1971). The present study redescribes Pseudaeginella montoucheti based on individuals
from Santa Catarina State, southern Brazil with the special reference to characteristics of
mouthpart and appendages. Additionally, a key for the species of the genus Pseudaeginella
and a checklist of Caprellidea occurring along the Brazilian coasts are also presented.

Materials and methods

Collections were conducted at two Islands - Passaros Island (26°22'S, 48°31'W) and Ara-
ras Island (26°27'S, 48°34'W) — in Tamboretes Archipelago, municipality of Balnedrio
Barra do Sul (16% May 2009) and at Sepultura Beach, Bombinhas (30° June 2011) Santa
Catarina State, southern Brazil. Caprellideans were found in the phytal of the red algae
Amphiroa beauvoisii Lamouroux and Spyridia aculeata (Schimper) Kiitzing, of the brown
alga Sargassum cymosum C, Agardh, 1820 and as the associate fauna of a tubiculous poly-
chaete colony; these communities were living over rocky surface in infralittoral depths,
from 0.5 to 7.0 m. The biological substrates were carefully wrapped up in a plastic bag
and scraped from the rocky surface with a spatula by scuba divers. In laboratory, the plastic
bag content was very kindly washed in dilute formalin. The deposited material was sieved,
sorted and caprellids were fixed and preserved in ethyl alcohol 70%.

From a total of 54 examined specimens (31 males and 23 females), several speci-
mens of male and female were selected to be dissected under stereomicroscope. ‘The
dissected material was mounted in polyvinyl lactophenol. All figures were drawn with
the aid of a camera lucida. Specimens are deposited in Museum of Natural History of
Capao da Imbuia (MHNCTI) and in Center for Zoological Studies (CEZ), from Insti-
tute of Biology, Federal University of Rio de Janeiro.

Results

Family Caprellidae Leach, 1814
Genus Pseudaeginella Mayer, 1890

Pseudaeginella montoucheti (Quitete, 1971)

http://species-id.net/wiki/Pseudaeginella_montoucheti
Figs 1-4

Fallotritella montoucheti: Quitete 197 1a, p.189-192, figs. 1-2
Pseudaeginella montoucheti — Laubitz, 1995, p.88.

Redescription of the rare amphipod crustacean Pseudaeginella montoucheti... 3

Material examined. MHNCI 2844 One female from the phytal of red alga Spyridia
aculeata, 7 m deep, Araras Island (26°27'S, 48°34'W), Tamboretes Archipelago, Santa
Catarina, Brazil, 16" May, 2009.

MHNCI 2845 One male and two females from the phytal of the calcareous red
alga Amphiroa beauvoisii, 4 m deep.

MHNCI 2846 Three males and two females from the phytal of Amphiroa beau-
voisii, 1.5 m deep, Passaros Island (26°22'S, 48°31'W), Tamboretes Archipelago, Santa
Catarina, Brazil, 16th May, 2009.

MHNCI 2847 Four males and two females from the phytal of brown alga Sar-
gassum cymosum, Bombinhas (27°08'28"S, 48°28'42"W), Santa Catarina, Brazil, 30"
June, 2011.

CEZ 968 Holotype male from of Sargassum, Itamaraca, Pernambuco, Brazil 5"
August, 1968. Collector: Dr. Pierre Montouchet.

CEZ 971 Two paratypes males and three paratypes females from of Sargassum,
Mar Grande, Bahia, Brazil, 22th January, 1968. Collector: Dr. Pierre Montouchet.

CEZ 972 12 paratypes males and eight paratypes females from of Sargassum, Ita-
maraca, Pernambuco, Brazil 5° August, 1968. Collector: Dr. Pierre Montouchet.

CEZ 973 Seven paratypes males and four paratypes females from of Sargassum,
Mar Grande, Bahia, Brazil, 22th January, 1968. Collector: Dr. Pierre Montouchet.

CEZ 974 One paratype male and one paratype female from of Sargassum, Guara-
pari, Espirito Santo, Brazil, 6" September, 1968. Collector: Dr. Pierre Montouchet.

A J aoe | Cae A
f ey] Pe 8 fo)

Figure |. Pseudaeginella montoucheti (Quitete, 1971). A male, lateral view B female, lateral view. Scale

bar: 1.0 mm.

4 Mariana Baptista Lacerda et al. / ZooKeys 146: 1-17 (2011)

Table |. Checklist of the Brazilian Caprellidae with their distribution in Brazil

Species
Caprellidae
Caprella Lamarck, 1801

Distribution in Brazil (references)

Caprella aculeata (Dana,
1853)

Caprella andreae Mayer,
1890

Caprella danilevskii
Czerniavski, 1868

Caprella dilatata Kroyer,
1843

Caprella equilibra Say, 1818

Rio de Janeiro (Wakabara and Serejo 1998)

Torres and Tramandai, RS (Arenzon and Bond-Buckup 1991)

Ubatuba, SP (Jacobucci et al. 2002; Cunha et al. 2008), Paranagua,

PR (Dutra 1988), Matinhos, PR (Dubiaski and Masunari 1995),
Bombinhas, SC (Dubiaski-Silva and Masunari 2008)

Arraial do Cabo, RJ (Serejo 1998), Ubatuba, SP (Jacobucci et al. 2002),
Santos, SP (Jacobi 1987), Peruibe, SP (Jacobucci et al. 2006), Penha, SC
(Masunari and Takeuchi 2006)

Ubatuba, SP (Jacobucci et al. 2002; Cunha et al. 2008), Sao Sebastiao,
SP (Flynn and Valério-Berardo 2009), Peruibe, SP (Jacobucci et al.
2006), Bombinhas, SC (Dubiaski-Silva and Masunari 2008)

Caprella globiceps Dana,
1853

Caprella penantis Leach,
1814

Rio de Janeiro (Wakabara and Serejo 1998)

Paranagua, PR (Dutra 1988), Matinhos, PR (Dubiaski and Masunari
1995), Bombinhas, SC (Dubiaski-Silva and Masunari 2008),
Governador Celso Ramos, SC (Mittmann and Miiller 1998)

Caprella scaura Templeton,
1836

Hemiaegina Mayer, 1890
Hemiaegina minuta Mayer,
1890 (= Hemiaegina costai
Quitete, 1972)

Arraial do Cabo, RJ (Serejo 1998), Ubatuba, SP (Jacobucci et al. 2002;
Leite et al. 2007; Cunha et al. 2008), Sao Sebastiao, SP (Flynn and
Valério-Berardo 2009), Peruibe, SP (Jacobucci et al. 2006), Bombinhas,
SC (Dubiaski-Silva and Masunari 2008)

Bahia and Pernambuco States (Quitete 1972; Serejo 1997)

Liropus Mayer, 1890

Liropus nelsonae Guerra-
Garcia, 2003

7°58'S, 34°17'W — 7°50'S, 34°17'W (Guerra-Garcia 2003a)

Monoliropus Mayer, 1903

Monoliropus enodis Rayol &
Serejo, 2003

Guanabara Bay, RJ (Rayol and Serejo 2003)

Orthoprotella Mayer,
1903

Orthoprotella melloi
Quitete, 1975
Paracaprella Mayer, 1890
Paracaprella digitimanus
Quitete, 1971

Pernambuco State (Quitete 1975)

1°21'S, 43°50'W (Quitete 197 1b)

Paracaprella pusilla Mayer,
1890

Arraial do Cabo, RJ (Serejo 1998), Ubatuba, SP (Leite et al. 2007), Sao
Sebastiao, SP (Flynn and Valério-Berardo 2009)

Paracaprella tenuis Mayer,
1903
Parvipalpus Mayer, 1890

Ubatuba SP (Cunha et al. 2008), Bombinhas, SC (Dubiaski-Silva and
Masunari 2008)

Redescription of the rare amphipod crustacean Pseudaeginella montoucheti... 5

Species Distribution in Brazil (references)

TAPERURYS Oman 7°58'S, 34°17'W — 7°50'S, 34°17'W (Guerra-Garcia 2003a)
Guerra-Garcia, 2003
Itamaraca, PE, Mar Grande and Olivenga, BA, Guarapari and Vitéria,
ES (Quitete 1971a), Arraial do Cabo, RJ (Serejo 1998), Ubatuba, SP
(Jacobucci et al. 2002; Cunha et al. 2008), Passaros Island (26°22'S,
48°31'W) and Araras Island (26°27'S, 48°34'W), Balnedrio Barra do Sul,

SC (present study)

Pseudaeginella Mayer,
1890

Pseudaeginella montoucheti
(Quitete, 1971)

Phtisicidae

Phtisica Slabber, 1769
Phtisica marina Slabber,
1769

Phtisica verae Quitete, 1979 | Rio de Janeiro State (Quitete 1979)

Arraial do Cabo, RJ (Serejo 1998), Peruibe, SP (Jacobucci et al. 2006)

BA, Bahia State; ES, Espirito Santo State; PE, Pernambuco State; RJ, Rio de Janeiro State; SC, Santa

Catarina State; SP, Sao Paulo State

Male (Fig. 1A). Body length 3.0 mm. Pereonites 3 and 4 the longest, followed by
pereonites 2 and 5. Head and pereonite 1 (suture clearly present) concave along dorsal
margin, head with an anteriorly curved mid-dorsal projection, pereonite 1 with a small
postero-dorsal projection. Pereonite 2 with paired mid-dorsal projections, 1 postero-
dorsal projection, paired antero-lateral projections and paired mid-lateral projections.
Pereonite 3 with paired mid-dorsal projections, 1 postero-dorsal projection and paired
mid-lateral projections. Pereonite 4 with paired mid-dorsal projections, 1 weak pos-
tero-dorsal projection, paired antero-lateral projections and paired mid-lateral projec-
tions. Pereonite 5 with paired mid-dorsal projections, paired antero-lateral projections
and paired mid-lateral projection near the swollen basal part of pereopod 5. Pereonite
6 with paired postero-lateral projections near the basal part of pereopod 6.

Antennae (Figs. 2A, 2B). Antenna 1 about half body length. Peduncular articles
with ca. 10 to 20 simple setae of varied length; peduncular article 2 the longest fol-
lowed by article 1. Flagellum 6-articulate with 4/5 of peduncular length. Antenna 2
about 4/5 of antenna | length, without swimming setae; peduncular setose in varied
length; flagellum with 8 and 6 simple setae in the proximal and distal articles.

Mouthparts (Figs. 3A—G). Upper lip notched, forming rounded projections. Right
mandible with incisor with 5 teeth and followed by lacinia mobilis with 5 teeth and
3 trapezoid plates; palp article 2 with 1 lateral seta; palp article 3 setal formula 1-6-1
with a distal knob. Left mandible incisor with 5 teeth followed by 3 trapezoid plates;
palp article 2 with 1 lateral seta; palp article 3 setal formula 1-6-1 with a distal knob.
Lower inner lips round and fused each other, outer lobes round with 1 apical seta.
Maxilla 1 outer plate with 6 stout apical setal-teeth; palp distal margin with 4 setae.
Maxilla 2 inner plate triangular with 4 apical setae; outer plate elongate with about 4
apical setae. Maxilliped basal endite (inner plate) with 2 setae on outer margin; ischial
endite (outer plate) oval, 2 times longer than inner plate, with 4 or 5 setae on inner

6 Mariana Baptista Lacerda et al. / ZooKeys 146: I-17 (2011)

Figure 2. Pseudaeginella montoucheti (Quitete, 1971). A-D male. A antenna | B antenna 2 C gnatho-
pod 1 D gnathopod 2. E female gnathopod 2. Scale bars: AE: 0.2 mm.

Redescription of the rare amphipod crustacean Pseudaeginella montoucheti... 7

Figure 3. Pseudaeginella montoucheti (Quitete, 1971). Male. A maxilliped B left mandible C right man-
dible D maxilla 1 E maxilla 2 F upper lip G lower lip. Scale bars: A-G: 0.05 mm.

8 Mariana Baptista Lacerda et al. / ZooKeys 146: I-17 (2011)

margin; palp article 2 with 2 or 3 setae on inner margin; palp article 3 with 5 distal
setae; palp article 4 (dactylus) weakly falcate.

Gnathopod 1 basis as long as ischium, merus and carpus combined, covered by
sparse setae of varied length; propodus subtriangular, palm with a pair of proximal
stout setae (grasping spines) and a row of 8 simple setae; dactylus with sparse and short
setae, inner margin smooth with a teeth subdistally (Fig. 2C).

Gnathopod 2 inserted in the pereonite 2 at 2/5 from anterior margin (Fig. 1A);
coxa vestigial; basis 1.3 times of pereonite 2 length, with a spiny projection near ante-
ro-distal corner; ischium rectangular; merus rounded; carpus triangular and provided
with scarce simple setae; propodus oval, ratio between width: length = 0.57, inner mar-
gin provided with 1 stout setae proximally, 3 triangular projections medially and dis-
tally and numerous setae: few simple setae on the outer margin; dactylus shorter than
palm and slightly curved with a row of setulae alongside the inner margin (Fig. 2D).

Gill 3 length 2/5 of corresponding pereonite, elliptical (Fig. 1A), pereopod 3 tiny
with 2 simple setae apically (Fig. 4A). Gill 4 length 1/3 of corresponding pereonite,
elliptical (Fig. 1A), pereopod 4 similar to pereopod 3 (Fig. 4B).

Pereopod 5 basis to carpus furnished with 3-10 setae of varied length; palm of
propodus very slightly concave with 2 setae proximally and a row of 7 robust setae
alongside; dactylus slightly curved (Fig. 4C). Pereopods 6 and 7 similar to pereopod 5
in feature but increasing in size (Figs. 4D, 4E).

Penes length about 2 times width (Fig. 4F).

Abdomen with a pair of lateral lobes and dorsal lobe with a pair of dorsal setae
(Fig. 4F).

Female. Body length 3.1 mm (Fig. 1B). Pereonites 3 and 4 subequal and the long-
est, followed by pereonite 2. Clear suture between head and pereonite 1, head with 1
anteriorly curved mid-dorsal projection. Antenna 1 flagellum 7-articulate. Pereonite
1 with 1 postero-dorsal projection. Pereonite 2 with paired mid-dorsal projections, 1
postero-dorsal projection and paired antero-lateral projections. Pereonite 3 with paired
mid-dorsal projections, 1 postero-dorsal projection, paired mid-lateral projections and
paired postero-lateral projections. Pereonite 4 with paired mid-dorsal projections and
paired mid-lateral projections. Pereonite 5 with paired mid-dorsal projections. Gna-
thopod 2 propodus length 1.5 times width (Fig. 2E), with grasping spine proximally
followed by a serrated margin; two smooth triangular projections medially.

Intraspecific variation. In adult males and females including those collected by
Quitete (Quitete, 1971a) in Pernambuco State, the number of articles in the flagellum
of antenna 1 varies from 5 to 7 during growth. ‘The size reduction of the mid-dorsal
projections on pereonites 3 and 5 mentioned by this author was only found among
specimens studied by her. Setal formula for terminal article of mandibular palp can be
1-5-1 or 1-6-1. The body spination is rather constant among individuals summing up
30 spines in males.

Type locality. Itamaraca, Pernambuco State, Brazil.

Distribution. Western South Atlantic. Brazil. Itamaraca, Pernambuco State; Oli-
venca, Ilhéus, Bahia State; Vitéria and Guarapari, Espirito Santo State (Quitete 197 1a).

Redescription of the rare amphipod crustacean Pseudaeginella montoucheti... 9

Figure 4. Pseudaeginella montoucheti (Quitete, 1971). Male. A pereopod 3 and gill 3 B pereopod 4 and
gill 4 C pereopod 5 D pereopod 6 E pereopod 7 F abdomen (ventral view). Scale bars: A,B: 0.1 mm.
C-F: 0.2 mm.

Ubatuba, Sao Paulo State (23°32'S, 45°10'W — 23°30'S, 45°08'W) (Jacobucci et al.
2002, 2009). Paranagua Bay, Parana State (25°31'S, 48 °30'W) (Neves 2006). Tam-
boretes Archipelago: Passaros Island (26°22'S, 48°31'W) and Araras Island (26°27'S,
48°34'W), Balnedrio Barra do Sul and Bombinhas Beach, Bombinhas, Santa Catarina
State (present study).

Habitats. Amongst thallii of the brown seaweed Sargassum sp. (Quitete 1971a and
present paper), Sargassum cymosum (Jacobucci et al. 2002) and Sargassum filipendula

10 Mariana Baptista Lacerda et al. / ZooKeys 146: 1-17 (2011)

(Jacobucci et al. 2009); on boat hulls and floating piers (Neves 2006); amongst thal-
lii of the red algae Amphiroa beauvoisii and Spyridia aculeata and tubular branches of
polychaete colony (present paper).

Remarks. Takeuchi (1993) proposed a classification with four families, Caprelli-
dae, Caprogammaridae, Paracercopidae, and Phtisicidae for the Amphipoda Caprelli-
dea (Cyamidae excluded) based on the cladistic analysis. Fallotritella and Pseudaeginella
were set under the Caprellidae. At the same time, Laubitz (1993) proposed a classifica-
tion with eight families, Caprellidae, Caprellinoididae, Caprogammaridae, Cyamidae,
Paracercopidae, Pariambidae, Phtisicidae and Protellidae. In her classification system,
Fallotritella and Pseudaeginella were included in Caprellinoididae which is considered
to be more related to Paracercopidae and Phtisicidae than to Caprellidae.

The above treatment of Fallotritella and Pseudaeginella performed by Takeuchi
(1993) was followed by Myers and Lowry (2003) and Vassilenko (2006). In the higher
classification system of Myers and Lowry (2003) based on cladistic analysis of coro-
phiid amphipods, Caprellidae, Caprogammaridae and Cyamidae are included among
the Caprelloidea. The Caprellidae of Myers and Lowry (2003) is composed of two sub-
families, Caprellinae and Phtisicidae. Fallotritella and Pseudaeginella with ca. 50 genera
constitute the Caprellinae under the Caprellidae (Myers and Lowry 2003). Vassilenko
(2006) reviewed the recent studies dealing her support to Takeuchi's (1993) treatment
more than to Laubitz (1993) concerning to the phylogeny of the Caprellidea.

The genus Fallotritella was established based on Fallotritella biscaynensis McCain,
1968 collected from Florida, U.S.A, Antigua & Barbuda and St. Lucia (McCain
1968), just prior to Quitete (197 1a). The suggestion of synonymy of these two genus,
i.e., Pseudaeginella and Fallotritella was mentioned under remarks of Pseudaeginella by
McCain (1968). The lack of reference materials of Pseudaeginella tristanensis (Stebbing,
1888), the type species of Pseudaeginella, has been led to the presumption towards
absence of pereopods 3 and 4 in Pseudaeginella. At the same time, F. biscaynensis was
recorded to possess 1-articulate pereopods 3 and 4 in the generic description for Fallo-
tritella. He also noted that, in case of presence of pereopods 3 and 4 in the two known
species of Pseudaeginella, Fallotritella would fall as junior synonym of Pseudaeginella
(see McCain 1968, p. 100). Almost 30 years later, Laubitz (1995) examined individu-
als of Pseudaeginella tristanensis collected from Amsterdam Islands in the southern In-
dian Ocean and reported the synonymy of these two genera based on the presence of
minute pereopods 3 and 4 on these specimens.

Pseudaeginella montoucheti (Quitete, 1971) is a tiny caprellidean that measures less
than 3.5 mm in body length (see Fig. 1). Within this genus, P montoucheti is the second
spiniest species (total of 30 spines on the head and pereonites 1-7 of males) and only
surpassed by P sanctipauli that has a total of 33 spines on body surface. In the drawing
of P montoucheti from Pernambuco State performed by Quitete (1971a) the follow-
ing body projections are missing in male: a pair of dorsal projections instead of one
dorsal spine medially on pereonite 5 and ventro-lateral projections over the insertion of
pereopod 5 and 6 on pereonite 5 and 6, respectively. In spite of the wide distribution,
P. montoucheti showed a relatively low intraspecific variation in its external morphology.

Redescription of the rare amphipod crustacean Pseudaeginella montoucheti... hl

Although restricted to the Atlantic coast of Brazil, the present study showed that P
montoucheti is distributed along more than 2,600 km, from tropical (Itamaraca Island, Per-
nambuco State, 7°44'S, 34°49'W) to subtropical (municipalities of Barra do Sul, 26°27'S,
48°34'W and Bombinhas, 27°08'S, 48°28'W, Santa Catarina State) latitudes. Recently,
Caprella dilatata Kroyer, 1843 was also reported showing wide distribution from Sao Pau-
lo State, Brazil (Jacobucci et al. 2002) to Mar del Cobo and Mar del Plata Harbour, Ar-
gentina along the south Atlantic coast of South America (Masunari and Takeuchi 2006).

Pseudaeginella Mayer, 1890 is currently composed of 10 species: P antiguae Barnard,
1932 from Antigua and Barbuda, P biscaynensis (McCain, 1968) from Florida, U.S.A., P
campbellensis Guerra-Garcia, 2003b from subantarctic islands of New Zealand, P colom-
biensis Guerra-Garcia, Krapp-Schickel & Miller, 2006 from Colombia, P inae Krapp-
Schickel & Guerra-Garcia, 2005 from Indonesia, P montoucheti (Quitete, 1971) from
Brazil, P polynesica (Miiller, 1990) from Bora Bora and Moorea, French Polynesia, P sanc-
tipauli Laubitz, 1995 from St. Paul and Amsterdam Islands, France, P tristanensis (Steb-
bing, 1888) from Tristan da Cunha, and P vaderi Guerra-Garcia, 2004 from Australia.

Of 10 species of Pseudaeginella, the closest species to P montoucheti can be con-
sidered P sanctipauli that was described from St. Paul and Amsterdam Islands, South
Indian Ocean (Laubitz 1995), since both are the spiniest species within the genus. On
the other hand, Pseudaeginella montoucheti can be distinguished from P sanctipauli by
the spinier body, antenna 1 length equals half body in males, and presence of ventro-
lateral spines over gills on pereonites 3 and 4.

A key to the species of Pseudaeginella is presented below; it was mainly based on
the characteristics of body somites because these can be observed without dissections
of mouthparts.

Key to species of the genus Pseudaeginella

la Antenna dT longer thanvhalt ‘of Body leneehs cess: ccd: saneats cscs amesneecee eisai, 2
1b Antenna | equal or shorter than half of body length... eeeeeeeeeees 5
Da Basis of gnathopod 2 longer than propodus length....P. sanctipauli (Fig. 5A)
2b Basis of gnathopod 2 shorter than propodus length 0.0... eee eeeeseeeeeeee 3
3a Basis of gnathopod 2 approximately the length of pereonite 2 0...

eae ARIA Doe he Ni arr hs ner el ar A P. biscaynensis (Fig. 5B)
3b Basis of gnathopod 2 longer than pereonite 2 length... eeeeeeeeeee 4.
4a Pereonites 2, 3, 4 and 5 with lateral projections near the insertion of gnatho-

pods, cillsaind pereo pOdSe 9S 21. ects dsideastea tages? P. colombiensis (Fig. 5C)
4b Pereonites 2, 3, 4 and 5 without lateral projections ...P polynesica (Fig. 5D)
aA Pete ONiLess wa tbr CO LSAlp LO se CLOIIS sical nal 8c teeter nese 6
5b Pereonites without atysdOtsaliprojecttOMs:. 5. cases t Wa asch ene aasenntscrtsteanentsoanes 8
Ga Basis of gnathopod 2 provided with a rounded projection proximally...........

oan neat eager ates Gone Man: Pee YA cham Ruhr an Pan ear mas. Pind P. campbellensis (Fig. 5E)
6b Basissor snathopod: 2-without any: PEO}ECHON ...0sic.ceisnencesonsatssoentdesndeoentenes Z:

12 Mariana Baptista Lacerda et al. / ZooKeys 146: I-17 (2011)

Figure 5. Pseudaeginella spp. A Pseudaeginella sanctipauli Laubitz, 1995 (Redraw from Laubitz 1995)
B Pseudaeginella biscaynensis (McCain, 1968) (Redraw from Guerra-Garcia 2002. Scale bar 0.05 mm)
C Pseudaeginella colombiensis Guerra-Garcia, Krapp-Schickel & Miiller, 2006 (Redraw from Guerra-
Garcia et al. 2006. Scale bar 1 mm) D Pseudaeginella polynesica (Miller, 1990. Scale bar 500 um) (Redraw
from Miiller 1990) E Pseudaeginella campbellensis Guerra-Garcia, 2003 (Redraw from Guerra-Garcia
2003. Scale bar 1 mm).

Redescription of the rare amphipod crustacean Pseudaeginella montoucheti... 13

Figure 6. Pseudaeginella spp. A Pseudaeginella montoucheti (Quitete, 1971). Scale bar 1 mm B Pseudae-
ginella tristanensis (Stebbing, 1888) (Redraw from Laubitz 1995) C Pseudaeginella vaderi Guerra-Gatrcia,
2004 (Redraw from Guerra-Garcia 2004. Scale bar 1 mm) D Pseudaeginella inae Krapp-Schickel & Guer-
ra-Garcia, 2005 (Redraw from Krapp-Schickel and Guerra-Garcia 2005. Scale bar 1 mm).

14 Mariana Baptista Lacerda et al. / ZooKeys 146: I-17 (2011)

7a Pereonites 4 and 5 with a paired antero-lateral projections, body somites with
a total of more than 30 projections «0.0.0... eee P. montoucheti (Fig. 6A)
7b Pereonites 4 and 5 without any antero-lateral projections, body somites with
a total of less than 30 projections «0.0.0... ceeeeeeeeeeeees P. tristanensis (Fig. 6B)
8a Basal article of antenna 2 peduncle with a distal projection, well marked su-
tute. between head and peréoniter |) .2...-.2a eee P. vaderi (Fig. 6C)
8b Basal article of antenna 2 peduncle without any projection, discrete suture
berweer-hcadsand perconttesh 2.5.00, 25.<8en caerusentescrenre tte P. inae (Fig. 6D)
Acknowledgements

We are grateful to Prof. Dr. Dantincia Urban for the critical reading and to Prof. Dr.
Luis Amilton Foerster for language revision, both from Federal University of Par-
ana. All biological sample collecting of the present study complies with the current
laws of Parana State and Brazilian Federal Government, and was conducted with the
permission of the Brazilian Institute of Environment and Renewable Natural Re-
sources-[BAMA-—of Parana and Santa Catarina State (Authorization 16247—1 DI-
FAP/IBAMA, Data 15/08/2008 and Authorization 23180—1 DIFAP/IBAMA, Data
29/04/2010). This is Contribution N°1820 of Department of Zoology, Federal Uni-

versity of Parana.

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