A New BathyalSpeciesoftheSquatLobsterGenusMunidaLeach,1820 (Crustacea:Decapoda:Anomura:Munididae)from Japan

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1 Nat.Hist.Res.Vol.13No.1:11-18.February2014 A New BathyalSpeciesoftheSquatLobsterGenusMunidaLeach,1820 (Crustacea:Decapoda:Anomura:Munididae)from Japan NaturalHistoryMuseum andinstitute,chiba 955-2Aoba-cho,Chuo-ku,Chiba Japan komai@chiba-muse.or.jp Abstract A new speciesofthesquatlobstergenusmunidaleach,1820,m.watatsumi,isdescribedandilustratedonthebasisoftwoovigerousfemalespecimenscolectedinthekumano Sea,Japan,atbathyaldepthsof m.ItappearsclosetoM.ampliantennulataKomai,2011, knownfrom theiwakiseamount,northpacificofjapan,m.magniantennulatababaandtürkay, 1992from thelaubasinandofqueensland,southwesternpacific,m.manqingaeliu,linand Huang,2013from thesouthwestindianridge,andm.typhlemacpherson,1994from thewestern Pacific.Diferentiatingcharactersbetweenthenew speciesandthelaterfourcongenericspeciesarediscussed.thenew speciesisthetenthofthegenusextendingtothedepthgreater than1500m. Keywords:watatsumi,ampliantennulata,KumanoSea -11- MunidaLeach,1820isthemostspecies-richgenus in the superfamily Galatheoidea,represented by about280speciesworldwide(babaetal.,2008;updatedbymacpherson,2009;2013;cabezasetal.,2009; 2011;Hendrickx and Ayon-Parente,2010;Komai, 2011a;2011b;2012).From watersaroundjapan,37 speciesofthegenushavebeen recorded (Komai, 2012).Thevastmajorityofspeciesinthegenusoccur insublitoraltoupperbathyalzonedownto1000m, buttenspeciesextendstothemiddlebathyaldepths greaterthan1500m (Babaetal.,2008;Komai,2011a; Liuetal.,2013). Thepresentarticleservestodescribeanew speciesofmunida,m.watatsumisp.nov.,onthebasisof twospecimenscolectedfrom thekumanosea,japan,atdepthsof m,duringthekt04-6 cruiseofrv Tansei-maru ofthejapanagencyfor MarineScienceand Technology (JAMSTEC).The new species appears close to M.ampliantennulata Komai,2011,presentlyknownonlyfrom IwakiSeamount,NorthPacificofJapan,M.magniantennulata BabaandTürkay,1992from thelaubasinandof Queensland,southwesternPacific,M.manqingaeLiu, Lin and Huang,2013 from the SouthwestIndian Ridge,andM.typhleMacpherson,1994,widelydistributedinthewesternPacific.Diferentiatingcharactersbetween thenew speciesand thelaterfour closerelativesarediscussed. ThetypespecimensaredepositedinthecolectionsoftheNaturalHistoryMuseum andinstitute, Chiba(CBM).Themeasurementprovidedispostrostralcarapacelength(cl),measuredfrom thebaseof therostrum tothemidpointoftheposteriormargin ofthecarapace.thehigherclassificationfolowsthat recentlyproposedbyahyongetal.(2010). Taxonomy FamilyMunididaeAhyong,Baba,Macphersonand Poore,2010 GenusMunidaLeach,1820 Munidawatatsumisp.nov. (Figs.1-3A,B) Materialexamined.Holotype:RV Tansei-maru, KT04-6cruise,stnKN-8(1),KumanoSea, 'N, 'E, m,1May2004,beam trawl, col.h.kohtsuka,ovigerousfemale(cl10.2mm),cbm- ZC Paratype:samedataasholotype,1ovigerousfemale(cl5.8mm),CBM-ZC Comparativematerial.Munidaampliantennulata.Holotype,female(cl7.0mm),RV Soyo-maru,2009cruise, Iwaki Seamount, 'N, 'E,1744m,9

2 -12- August2009,benthosnet,col.KeichiKakui,CBM- ZC Description.Holotype female.carapace (excluding rostrum)(fig.1a)1.2timesaslongaswide.dorsal surfacegentlyconvextransversely;maintransverse ridges mostly uninterrupted medialy;secondary transversestriaefew;moststriaewithoutrow ofsetae.gastricregionslightlyelevated,with1pairofepigastricspines(theseepigastricspinesappearingto arisefrom granulateridgeinterruptedmedialy);postrostralcarinalow,obsolescent.cervicalgroovedistinct.noconspicuousspinesotherthan epigastric spinespresenton dorsalsurface.anteriorpartof branchialregionbetweencervicalgrooveandtransverse groove with short,transverse or obliquely transverseridges,butwithoutspine;posteriorpartof branchialregion with 5 main transverse ridges (excludingposterodorsalridge)andafew shortsecondarystriaelateralybetweenmainridges.cardiacregion with 4 transverse ridges,anterior 3 ridges interrupted lateraly,posteriormostridgecomplete, extending tolateralmargin.intestinalregion with shorttransverseridgemedialy;posterodorsalridge distinct,slightlyconvexmedialy,with1secondary stria.frontalmarginsslightlyoblique.anterolateral margins slightly convex;lateral margins nearly straightingeneraloutline.anterolateralspineseach locatedatanterolateralangle,moderatelylong,faling shortoflevelofsinusbetweenrostrum andsupraocularspines.secondmarginalspineanteriortocervical grooveabouthalf-lengthofanterolateralspine.branchialmarginseachwith5smalspines,anteriormost spinelargerthanotherspines. Rostrum (Fig.1A)spiniform,about0.4timesas longascarapace,nearlyhorizontalinlateralview.supraocularspinesmoderatelylong,slightlydiverging anteriorlyandveryslightlyascendinginlateralview, about0.3lengthofrostrum.innerorbitalspineslender,clearlyvisibleindorsalview. Pterygostomialflap (Fig.1B)pointed anteriorly withminutegranule:lateralfacerugosewithscatteredobliquelytransverseridges. Thoracicsternite3(Fig.1C)about3.7timeswider thanlong,distinctlyseparatedfrom sternite4,much widerthananteriorwidthofsternite4;anteriormarginfaintlygranulate,withdistinct,v-shapedmedian notch.sternite4with medialy interrupted transverseridgeadjacenttoanteriormargin,anteriorpart somewhatsloping toward anterior;ventralsurface shalowly concave medialy,with faintvery short striaemedialy.sternites5-7smooth.transverse ridgesdividingsternitesnearlysmooth,withsparse shortsetae. Secondpleomere(Fig.1A)with1distinct,uninterrupted,transversestriaontergum;anteriorridgeunarmed.Thirdpleomere(Fig.1A)with1uninterrupted, transverse stria on tergum, unarmed anteriorly. Fourthpleomereonlywithanteriorridgeontergum, unarmed.sixthpleomere(fig.2g)withbroadlywshaped grooveon posteriorhalf,otherwisesmooth. Telson(Fig.2G)slightlywiderthanlong,incompletely dividedin5plates(divisionofposterolateralplatenot obvious);scatered squamiform ridges on posterolateralplates. Eyes(Figs.1A,2A)smal.Corneaaboutaslongas eyestalk,notdilated,cornealwidthsubequaltowidth betweenrostrum andsupraocularspineandabout 0.10 ofcarapace length.eyestalk cylindrical;eyelashesabsent. Basalsegmentofantennularpeduncle(Figs.1A, 2A)stout,lengthexcludingdistalspinesabout1.7of width;distalspinesunequalwithmesialspinemuch shorterthanlateral;2lateralspinespresent,distal spinelocatedproximaltobaseofdistolateralspine, not reaching it,proximalspine located slightly midlengthofsegment;statocystlobeinflated,ventral surfacerounded,withscateredminutetuberclesand sparsesetae. Antennalpeduncle(Figs.1A,2A)moderatelystout, overreaching distalcornealmarginsby length of fourthsegment.firstsegmentwithmoderatelyshort distomesialspinereachingmidlengthofsecondsegment;distolateralangleunarmed.second segment withsmalspineeachatdistomesialanddistolateral angles,spinessubequalinlength,distomesialspine reachingmidlengthofthirdsegment.thirdsegment withsmalspineatdistomesialangle,unarmedondistolateralangle.fourthsegmentunarmed. Thirdmaxiliped(Fig.2B)moderatelyslender.Ischium distinctlylongerthanmerus,withtinyventrodistalspine,extensordistalangleunarmed.merus notmarkedlynarroweddistaly,flexormarginwith2 greatly unequalspines,distalspinetiny,proximal spine prominent, arising slightly proximal to midlength;extensordistalmarginunarmed.exopod narrowlydistaly,distinctlyoverreachingdistalmarginofmerus;lateralsurfaceslightlyrugose. Onlyrightcheliped(Fig.1D-F)preserved,about 2.0timesaslongascarapace.Meruswithrow of7 spinesondorsalsurfacelateraly(spinesincreasingin

3 A new speciesofmunidafrom Japan Fig.1.Munidawatatsumisp.nov.,holotype,ovigerousfemale(cl10.2mm),CBM-ZC12097.A,carapace,pleon (flexed),andcephalicappendages,dorsalview;b,leftpterygostomialflap,ventrolateralview (perpendicular); C,thoracicsternum,ventralview;D,chelaandcarpusofrightcheliped,dorsalview (setaeomited);e,merus ofrightcheliped,dorsalview (setaeomited);f,same,ventralview.scalebars:2mm. -13-

4 -14- size distaly,distolateralspine strongly diverging) and 2prominentspinesdistomesialy (distalspine strongerthandistolateralspine);lateralfacewithminute,somewhatscale-liketuberclesbecominglarger ventralyandwith1strongspineatventrodistalangle;mesialfacewithsparsegranules,armatureincluding1prominentsubdistalspinesomewhatproximal tobaseofdistomesialspine,1prominentspineatventromesialdistalangleand1moreprominentspineon ventromesialmargin arising atdistal0.3length of merus;ventralsurfacewithtinytosmalscale-liketubercles;setaeonsurfacessimpleorslightlyplumose, lengthquitevariable.carpusabout0.8timesaslong aspalm,about1.9timeslongerthandistalwidth;dorsolateralmarginwith4spinesnoticeablyincreasing in sizedistaly (distalmostspinesubmarginal),dorsomesialmarginwith4spines(secondspineprominent,strongly diverging;distomesialspine tiny); lateralfacewithsomesmal,scale-liketuberclesbecominglargerventralyand1conspicuoussubterminalspineonmidline;ventromesialfacewith2smal subterminalspines.palm about1.8timeslongerthan wide;dorsalsurfacewithrow oftinyspinesandtuberclesonmidline,dorsolateralmargin5spinesnoticeably increasing in size distaly, dorsomesial marginwith4spinesalsoincreasinginsizedistaly, distomesialangleunarmed;mesialfacewithoutconspicuousspines(fig.3a);ventralsurfacewithsmal, low,scale-likeormultidenticulatetubercles;fixedfingerstraight,terminatinginsharpclaw,with1tiny subdistaltuberclelateralyand1moderatelystrong spinesomewhatproximaltomidlength(fig.3b),cutting edge slightly sinuous,with row ofminute, roundeddenticles.dactylus1.3timesaslongaspalm, unarmed on dorsalsurface,terminating in sharp, curvedclaw crossingtipoffixedfinger;mesialmarginwithfew low tubercles;cutingedgewithrow of minute,roundeddenticlesoverentirelength,very narrow proximalhiatusbetweendactylusandfixed finger.setationonchelasparse,setaeondorsalsurfaceshort,thoseonlateralandmesialfacesmixture ofshortandlongishones. Ambulatorylegs(secondtofourthpereopods)moderatelylongandslender,secondandthirdpereopods subequalinlength,fourthpereopodshorterthanprecedingpereopods.secondpereopod(fig.2c),when anteriorlyextended,reachinglevelofmidlengthof rostrum bytipofmero-carpalarticulation,about1.9 timesaslongascarapace;merusabout0.9timesas longascarapace,about7.1timeslongerthanwide, dorsalmarginwithrow ofsparsesetaeand10spines noticeablyincreasinginsizedistaly,ventralmargin with1strongdistolateralspinefolowedby3smaler spinesandsomeshorttransverseridges,lateralface withscateredshortsetae,ventromesialdistalangle with1moderatelysmalspine;carpusaboutone-third lengthofpropodus,withprominentextensordistal spinefolowedby1smalerspineor2closeproximal spinulesonextensormargin,flexordistalmarginproducedinspine,lateralfacewithweaklongitudinal ridgedorsaly,otherwisenearly smooth;propodus withfew minutegranulesonextensormargin,lateral facewithfew minutegranulesandfew longsetae, flexormargin with row ofmovablespinesevenly spaced;dactylus(fig.2d)about0.6timesaslongas propodusand 5.9 timeslongerthan basalwidth, slightlycurveddistaly,bearingsparseshorttolong stifsetae,flexormarginfaintlysinuous,with9or10 corneousspinulesdecreasing in length proximaly alongentirelength(ultimatespinuleslender,contiguouswithclaw).thirdpereopod(onlyrightsidepreserved)(fig.2e)similartosecondpereopod;merus bearingrow of11spinesincreasinginsizedistaly and becoming double row proximaly on dorsal margin,ventralmarginwith1moderatelystrongdistalspinefolowedby1smalerspineandrow ofshort transverseridges;carpussimilartothatofsecond pereopod;propoduswith6movablespinesonflexor margin;dactylusbrokenofatdistalpart,thusexact numberofflexorspinulesunknown(preservedpart with 7flexorspinules).Fourth pereopod (Fig.2F) slightlyfalingshortofanterolateralangleofcarapacebymero-carpalarticulation;ischium withtiny dorsodistalspine;merusabout0.7lengthofthatof secondpereopod,with5or6spinules(includingdistal one)ondorsalmarginandwith1strongdistalspine folowedbylow transverseridgesonventralmargin; carpuswith prominentextensordistalspine and flexordistalspine,distinctlysmalerthanthoseofprecedingpereopods,extensormarginwith1additional smalspine slightly distalto midlength;propodus with 5movablespineson flexormargin;dactylus with9corneousspinulesonflexormargin. Merusoffifthpereopodalmostsmoothonlateral surface. Uropodalexopod (Fig.2H)with lateralmargin faintly denticulate,with minute movable spinules; outersurfacewithmovablespinulesarrangedin2 longitudinalrowsalonglateralmargin;posteriormargintruncate,withrow ofminutemovablespinules.

5 A new speciesofmunidafrom Japan -15- Fig.2.Munidawatatsumisp.nov.,holotype,ovigerousfemale(cl10.2mm),CBM-ZC12097.A,lefteye,basalsegmentofleftantennularpeduncle,andantennalpeduncle,ventralview;B,leftthirdmaxiliped,lateralview (setaeomited);c,rightsecondpereopod,lateralview;d,same,dactylus,lateralview (setaeomited;fifth flexorspinefrom ultimatemissing);e,rightthirdpereopod,lateralview (sixthflexorspinefrom proximalon dactylusmissing);f,rightfourthpereopod,lateralview;g,sixthpleomereandtelson,outerview;h,lefturopod,outerview.scalebars:2mm forc,e,f;1mm fora,b,d,g,h.

6 -16- Endopodwithlateralmarginfaintlydenticulate,bearingminutemovablespinules;outersurfacewithlow, shorttransverseridgesarranged in 2longitudinal rows,eachbearing1-3movablespinules,onlateral half;posteriormarginroundlytruncate,withrow of minute movable spinules.uropodalprotopod (Fig. 2D)withminutespineposteriorlyoninnerside. Paratype.Generaly similartoholotype.anterior partofbranchialregion with 2 main transverse striae.posterodorsalcarinaoncarapacewithoutsecondarystria.rostrum about0.3timesaslongascarapace.chelipedsabout1.8timesaslongascarapace; fixedfingerwith2strongdorsolateralspines;cuting edgesoffingersonlyfaintlydenticulate. Colorationinlife.Notknown. Distribution.Sofarknownonlyfrom KumanoSea, Japan,atdepthsof m. Remarks.Munidawatatsumisp.nov.appearsclosest tom.ampliantennulataandm.magniantennulatainhavingfivebranchialspinesandonepairofepibranchial spinesonthecarapace,slightlyobliquefrontalmargins ofthe carapace,unarmed second pleomere, smal,non-dilatedcornea(thecornealwidthisalmost equaltothedistanceofthesinusbetweentherostrum andsupraocularspine),andtherelativelystout basalsegmentoftheantennularpeduncle.thenew speciesdifersfrom M.ampliantennulatainthefolowingparticulars:(1)maintransverseridgesontheposteriorbranchialregionofthecarapaceareentirein M.watatsumisp.nov.,whereasmanyofthem areinterruptedorsubdividedinshortridgesinm.ampliantennulata;(2)therearedistinctlyfewersecondarystriae betweenmainridgesinm.watasumisp.nov.thanin M.ampliantennulata;(3)spinesontheantennalpedunclearerelativelystrongerinM.watatsumisp.nov. thaninm.ampliantennulata,particularlythedistomesialspineonthefirstsegmentreachesthemidlength ofthatsegment;(4)thepalm ofthechelipedisdistinctlylongerthanthecarpusandlacksspinesonthe mesialfaceinm.watatsumisp.nov.,whereasthepalm issubequalinthelengthtothecarpusandarmed withoneortwostrongspinesonthemesialfaceinm. ampliantennulata;(5)dorsolateralspinesonthefixed fingerofthechelaarestronginm.watasumi,rather thanminuteinm.ampliantennulata. Thenew speciesisdistinguishedfrom M.magniantennulataby(1)thelessconvexanterolateralmargin ofthecarapace,(2)theabsenceofaspineontheanteriorpartofthebranchialregion,(3)thestrongerdistomesialspineonthefirstsegmentoftheantennal peduncle(reachingtothemidlengthofthesecond segmentversusfarfalingshortofit),(4)thepossessionoftwospinesontheflexormarginofthethird maxilipedmerus,and(5)thepresenceofconspicuous spinesonthefingersofthecheliped.inm.magniantennulata,theanteriorpartofthebranchialregionbears onesmalspine;thethirdmaxilipedmerusisarmed withthreespinesontheflexormargin;andthefingersofthechelipeddonothaveconspicuousspines (BabaandTürkay,1992). MunidamanqingaeandM.typhlearealsosimilarto M.watasumisp.nov.Nevertheless,thenew speciesis immediatelydistinguishedfrom M.typhleby(1)the relativelyshortsupraocularspines(reachingtodistal cornealmarginsversusoverreachingthem),(2)the possessionofonlyonepairofepigastricspinesonthe carapace,(3)thelackofspinesonthesecondpleomere,and(4)therelativelyshortdistomesialspineof thefirstsegmentoftheantennalpeduncle(reaching midlengthoffirstsegmentversusnearlyreachingdistalmarginoffirstsegment).inm.typhle,therearefive pairsofepigastricspinesonthecarapace;thesecond pleomereisarmedwithtwopairsofspinesontheanteriorridge(macpherson,1994).theslightlyoblique frontalmargin of the carapace (versus strongly oblique)andthepossessionofonepairofepigastric spines(versusthreepairs)immediately distinguish thenew speciesfrom M.manqingae(cf.Liuetal.,2013). ThefolowingninespeciesofMunidaareknownto occuratdepthsgreaterthan1500m (Babaetal.,2008; Komai2011a;Liu etal.,2013):m.ampliantennulata (IwakiSeamount,NorthPacific,1744m),M.asprosoma AhyongandPoore,2004(New SouthWales,Vanuatu andtaiwan, m),m.curvipesbenedict,1892 (southeasternpacificofchile,1922m),m.endevourae AhyongandPoore,2004(ofsoutheasternAustralia, NorfolkRidgeandKermadecRidge, m),M. magniantennulata (Lau Basin and of Queensland, southwesternpacific, m),m.manqingae (SouthwestIndianRidge,2218m),M.microphthalmaA. Milne-Edwards,1880(AtlanticOcean, m), M.subcaecaBouvier,1922(easternandwesternAtlantic, m),andM.tiresiasMacpherson,1994 (New Caledonia,Taiwan,andJapan, m). Thepresentnew speciesisthetenthofmunidaoccurringatsuchgreatdepths,andrepresentsoneofthe deepest records next to M.manqingae,M.microphthalmaandM.tiresias. Etymology.NamedaftertheJapanesegodofthesea Watatsumi.

7 A new speciesofmunidafrom Japan -17- Fig.3.A,B,Munidawatatsumisp.nov.,holotype,ovigerousfemale(cl10.2mm),CBM-ZC12097.C,D,MunidaampliantennulataKomai,2011,holotype,female(cl7.0mm),CBM-ZC10020.A,C,chela,ventralview (A,right;C, left);b,d,fixedfingerofchela,dorsalview (B,right;D,left).Scalebars:1mm. Acknowledgments IdeeplythankMr.HisanoriKohtsuka(MisakiBiologicalStation,theUniversityofTokyo)forproviding mewith interesting colectionsofdecapod crustaceansmadebyhim forstudy.ialsothankdrs.enriquemacpherson(centrodeestudiosavanzadosde Blanes)andShaneT.Ahyong(AustralianMuseum) forreviewingthemanuscriptandforoferingvaluablesuggestionsforimprovements,and Dr.MasayukiOsawa (Research CenterforCoastalLagoon Environments,ShimaneUniversity)forprovidingme withcopiesofrelevantliterature. References Ahyong,S.T.,K.Baba,E.MacphersonandG.C.B. Poore.2010.A new classificationofthegalatheoidea (Crustacea: Decapoda: Anomura). Zootaxa (2676): Baba,K.,E.Macpherson,C.-W.LinandT.-Y.Chan CrustaceanFaunaofTaiwan:SquatLobsters (ChirostylidaeandGalatheidae).ix+ 311pp.NationalTaiwanOceanUniversity,Keelung. Baba,K.,E.Macpherson,G.C.B.Poore,S.T.Ahyong, A.B.P.Cavezas,C.-W.Lin,M.Nizinski,C. RodriguesandK.E.Schnabel,2008.Catalogueof squatlobstersoftheworld(crustacea:decapoda: Anomura families Chirostylidae,Galatheidae andkiwaidae).zootaxa(1905): Baba,K.andM.Türkay.1992.Munidamagniantennulata,anew deepseadecapodcrustaceanfrom active thermalventareasofvalu-fa-ridgein thelau Basin,SW-Pacific(Anomura:Galatheidae).Sencken. Mar.22(3/6): Cabezas,P.,C.-W.LinandT.-Y.Chan.2011.Twonew speciesofthedeep-seasquatlobstergenusmunida Leach,1820(Crustacea:Decapoda:Munididae)from Taiwan:morphologicaland molecular evidence. Zootaxa(3036): Cabezas,P.,E.MacphersonandA.Machordom Morphologicalandmoleculardescriptionsofnew speciesofsquatlobster(crustacea:decapoda:galatheidae)from thesolomonandfijiislands(south-

8 WestPacific).Zool.J.Linn.Soc.156: Hendrickx,M.andM.AyonParente.2010.A new speciesofmunidaleach(decapoda,galatheidae)from ofthewestcoastofbajacalifornia,mexico.in Fransen,C.H.J.M.,S.DeGraveandP.K.L.Ng (eds.) Studies on Malacostraca. Crustaceana Monogr.(14): Komai,T.2011a.A new speciesofthesquatlobster genusmunida (Decapoda:Anomura:Galatheidae) from thenorthpacificofjapan.inkomai,t.and H.Komatsu (eds.),new CrustaceansofJapan 2. Bul.Natn.Mus.Nat.Sci.,Suppl.(5): Komai,T.2011b.SquatlobstersofthegenusMunida (Crustacea:Decapoda:Anomura:Munididae)from theogasawaraislands,withdescriptionsoffour new species.mem.natn.mus.nat.sci.(47): Komai,T.2012.SquatlobstersofthegenusMunida Leach,1820(Crustacea:Decapoda:Munididae)from thesagamiseaandizuislands,centraljapan,with descriptionsof10new species.nat.hist.res.12(1): Liu,X.,R.LinandD.Huang.2013.A new speciesof deep-seasquatlobsterofthegenusmunidaleach, 1820(Crustacea:Decapoda:Anomura:Munididae) from ahydrothermalfieldinthesouthwesternindianocean.zootaxa(3734): Macpherson,E.1994.CrustaceaDecapoda:studieson thegenusmunidaleach,1820(galatheidae)innew Caledoniaandadjacentwaterswithdescriptionsof 56new species.incrosnier,a.(ed.),résultatsdes CampagnesMUSORSTOM,Vol.12.Mém.Mus. natn.hist.nat.(161): Macpherson,E.2009.New speciesofsquatlobstersof thegeneramunidaandraymunida(crustacea,decapoda,galatheidae)from VanuatuandNew Caledonia.Zoosystema31(3): Macpherson,E.2013.New speciesandnew occurrencesofsquatlobsters(crustacea,decapoda,munididae,eumunididae)from French Polynesia.In Ahyong,S.T.,T.-Y.Chan,L.CorbariandP.K.L. Ng(eds.),TropicalDeep-seaBenthos,Vol.27.Mém. Mus.natn.Hist.nat.(204): 日本産深海性チュウコシオリエビ属 ( 甲殻亜門 : 十脚目 : 異尾下目 : チュウコシオリエビ科 ) の 1 新種 駒井智幸 千葉県立中央博物館 千葉市中央区青葉町 三重県沖熊野灘の深海 ( 水深 m) から採集された雌標本 2 個体に基づき チュウコシオリエビ科チュウコシオリエビ属の新種 Munidawatatsumi ( 新称 : ワタツミチュウコシオリエビ ) を記載した. 本属には 280 種を超える既知種が知られるが, 大多数は浅海域 漸深海帯に生息し,1500m を超える大深度に生息する種は本新種を含め,10 種に限られる. 本新種は, 形態的には M.ampliantennulataKomai,2011( 磐城海山 ),M.magniantennulataBabaandTürkay,1992( 南西太平洋 ),M.manqingaeLiu,LinandHuang,2013( 南西インド洋海嶺 ), および M.typhleMacpherson,1994 ( 西太平洋 ) の 4 種に形態的に類似するが, 頭胸甲の形状とその背面の横走陵線の数, 鉗脚の棘の大きさや位置などの諸形質により識別される. (Received2October2013;Accepted6December2013) -18-