Bull. nat. Hist. Mus. Lond. (Zool.) 64(1): 1-62 Issued 25 June 1998 
THE NATURAL 
HISTORY MUSEUM 
29 JUN 1998 
PRESENTED 





A revision of the cladoceran genus 
Simocephalus (Crustacea, Daphniidae) 




MARINA J. ORLOVA-BIENKOWSKAJA fe 
A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky prosp. 33, Moscow 
117071 Russia 



CONTENTS 
MESO IL OM ecese osozessxecets steecerstacduncnnyesserettaerr es tranccteccesaes saan frien asus der asoatrnsere canes ecuseeee tae tema SCa op Su caiaus te vaeeay ava Lea Sedbe sdaues caus Reaind 2 
NyMet Ces Tr cod rc ASTUTE LOS aor nee eee eae cect Nee en cocasacset oats «icc opteeatas Ms sandy A neat Ties ra eee, sean t aster ced. we teabea tues 3 
SEE GOTap INCH] Ds yee ears serra cen ety te ete eta ae EN, SOR Ene Be A ath ivan ole Susans cacao nn save uvzavawuadh «ches cyioedueunivepemtesmebetereag 3 
WATT A BD ELEY sce ca cpairteerreisc cds acer esWOWASE etna eect taaneccsuas ene nent sUeasmtudets ct eae rendat ws kecuisnenadabaeo esate cavsucilous Pose suasaanbs neces covepindentosuphescosucncazeoen 5 
SSE Mle OMAN COO LIMES IE cto <ctree gs cae cde sec te ee nete Th Maree enn c te. PORN a estan Mn Steck M es oy eet ce dinw vedi a wauon cNenan cctiearansdtetonsasecenciwhdhed= 6 
IS UIE INNS S717 COPIA AS US a veers Rees ee eae ROE nC ccc dave cana ca Pee Soe cna taeste ae aencec acca siennavasnnacusssuAussdsasacauneteemacsarsuai> 6 
Se eretred res (ESV IMUM restligIGA ©) Yas eects cee esse tea nee ee cee a les sace dada hac kina A Roca an ate sdupeanisancesSbanzcoisahexacaghe snazuiensseatvaccescaaser scene 7 
SAUCES AUS: OO) Slee nase. eteet oe anata ee My ase Ren ace Aetecnnons econanescsapnasisnevneerssesaonmntenatere ESpee a ereeerese 1] 
NSM CLITLOTCL CSPSTCUGS NLT at Cee nee ee a I orca ac amen a eda dad oota vil eoo swan veasndastivanaatetad acncaaecedesonslcetacvanteeecuveces lp 
SEP TIEANL CCEEVAS)S [501 © Waay Ser. Seca Pa eet ees eee sence ee eRe akc oscar ga sce SNA ale Sea c waco Rance a avosseessavoru heat cpnedatdanctest vesteceecvecenceehee 14 
IS EAGT OO STEN ALOU OO aces aucescatv eve asa anciacetet eo cceu Nas canon dsvachsip csteeaishesesntsascudecssetasnnsupovevaphecabe az ahtscasdaxsseszsaausieasdansésssdszdsscs 15 
SE CLIZAD EAE USIM ER US SSI) cscatee cate esseesvse tee ses eoexadcsosvecsiasuaeesucenscuczee fakatess cuserisivactvaraneMeeale aePesesdcsvacasacterttessvisedeca cosaiurche aves 16 
HD GEMUS Si (EGHMIO GOMES) SUD SEMIONOV, 4s. Pana nsuantee eetetee cnn rsncdaerondedecsnaecoconotaeade Mughtsstaactondlt ect rertecteneetsbantvetvedeseceee 20 
AS EECUALIDSCLPFASH (HULME OMI mts 1,05) ees aera cee se hn ous soem teat ccna cnet cveananccepececstietecsotteaceseracaattersescccttawaee ss saeascesieuswasssesss 2A 
LEHI OLG CRAIC INC Kom ONS RRR nan aces saees cn MO MR AS as ous asa asua sive wner ste dadatanducuye ut oepe was. seen aphucadauseusghttesaactses ducVauescecuawesncvars 21 
S. (exspinosus) SPeCi€S ZTOUP ..........eeceee 
S. exspinosus (De Geer, 1778) .......-..:006 
S. congener (Koch, 1841) ..........eseeeeeeee 
S. (acutirostratus) species ZTOUP ..........0.. 
S. acutirostratus (King, 1853) ...........0 
S. victoriensis Dumont, 1983 .............0- 
S. Drenme Gauthier, U9S OT 2... ..s.sesc+-ce-osere 
DS ZOU SED CALEASMEL CLUE Kn es ee, cae vec se seecte eee Meme tae aT at ee oe Rec Ba se. en coe ps de ey ac vou ldeinden De daseee Cea ad mutta Douisaass 
Subpenusns(Coronacephalns) Onlova-Bienkowskaja, V99S) cvsteer<caswescctanesnsceeosevesscusssnteaghassesavaassuceasaasveseausevessuencevacnenseaate== 39 
GNS CITIAL CLES ISOC LL AUS AUD) Peres see ce ote esecaceesetece klene ese sees ssc cee ncs ee eS u aan nesses sPiaensxdcncAy-n save Pebuostsecaccastsatescestoueaccoceoseenest des 4] 
ASIHS CIPLESC IT CELELSTS AUS eva Ul Uetes coe cee este ce cee eee ca Me crea oy cee rece senne rasan ccaseassasueageckcnesessces ac Meeeeetena waesavabisdevevervecvereseent 46 
SMELL T CO TILSESP SMT Vite eater mea neeee cs cee cae ds ha ten taer sate ne cote RO IPY ade etc vass aus ves sasu weer tases sensoal swaiseisvaveccesVossateaseaesnetesbess 49 
Subpenuss: (Aguipianius))! Orlova-Bienkowskajay OOS os icc... tease cteee-ceats-ceccsetscennsdeeccsacestluaestsdenesenssaesnneeteasennscencasssteaesas 52 
SEP ALTOS TMU STUNT SoA Cpe, eee netacate sce seeeratatechecstlars acs esttasnccasVtssewsvcteet vetue- <dcasevatss’sisoccssnenevaccuceucsoleateresnetagseveceoessteartace 53 
ee ELL OF OFLGMIGEHISIS. S leg Dill 09 Aircore eetexsudeos: Geatas <suscovscartenesnneettaconretouccetrederusesssteccs+stnddanarsenaesudncescdsvaasodeeveeacesanneesurs 53 
SSUES CUPEG TAS) EA titgu UMM ieee eases nes arene asta cs Pere este cb oe gaa eves asin as avenue cteaace «ot Maca seatnscaetanacs vuncurdeusvisesnkssaiceved cvdavevtesevsceezasectdesst 53 
Nomma auvigand SpEeclesitranstercedat© the Se MUSw apa: ..c....cccectrveresaeetusceraatenarscueexecoctescs-esseesenevaccatesceaseatenresaciieersceseeeresre 54 
Key tothe subpenerarandispecres Ol SUMOCED GIS s..ccecueresacenccsascorttrneecee ine suseerttas cone eaacc rss thaccortedeed te oeecar see cadhesesaccserecdoserswereor 54 
GheckslistiotiSiio Ge plialtsy. s:cetec cakes svsesceqc sete Ue Sesto nen costing ote cca aero eee eas eae ee Mec ea ee Toa saa es cade suet sesec¥esasertnieeaats: 60 
PNCRNOWIEA SENSIS eset retried ae css os cs wav eck ent. condeshe cool Poe eT eRe tea tc gee ta eee nee RELA Mee ric boass feck nace acta te ee 60 
IRELCLEM GES neremesesscectecesscactursossMe ck sersunceucscetwenuc tag Mectuaa caseuant dexchsaueusternecetteetee esate ey lcucaus Maga mee mmaa te MNOnE puctaetrdecsutb ees Mebreeedeeetts 60 
SYNOPSIS. Simocephalus, a world-wide genus of littoral freshwater Daphniidae is reviewed in full for the first time. Four 
subgenera are recognized, one subgenus and two species are newly described. Eight species and subspecies are synonymized, a 
number of previously synonymized species are reinstated and two species are transferred to the genus Daphnia. Thus, twenty 
species are considered as valid members of the genus Simocephalus: subgenus Simocephalus s. str.: S. vetulus, S. elizabethae, S. 
gibbosus, S. vetuloides, S. mixtus and S. punctatus sp. noy.; subgenus S. (Coronocephalus): S. serrulatus, S. semiserratus and S. 
mirabilis sp. nov.; subgenus S. (Aquipiculus): S. latirostris, S. lusaticus andS. heilongjiangensis; new subgenus S. (Echinocaudus): 
S. exspinosus, S. congener, S. acutirostratus, S. obtusatus, S. daphnoides, S. rostratus, S. brehmi, S. victoriensis. For each species, 
accounts are given of nomenclature, distribution and morphology (with original figures ).A key for identification of subgenera and 
species is provided. 
© The Natural History Museum, 1998 
