布村 昇

Toyama Science Museum Repository

BuletinoftheToyamScienceMuseumNo.6p.57-64;(1984 》TwoNewIdoteidIsopodafromOtsuchiBay,NorthernJapan*NoboruNunomura甲TovamaScienceMuseum岩 手 県 大 槌 湾 か ら 発 見 さ れ た ヘ ラ ム シ 科 等 脚 目 の 2 新 種布 村 昇富 山 市 科 学 文 化 セ ン タ ー岩 手 県 大 槌 湾 で 採 集 さ れ た ヘ ラ ム シ 科 等 脚 目 の 次 の 2 新 種 を 記 戦 し た 。Sy 戒 伽tea α αita,n.sp. ト ガ リ ワ ラ ジ ヘ ラ ム シ （ 新 称 ）Sv 加 加" 偲planus,n.sp: ヒ ラ タ ヤ リ ボ ヘ ラ ム シ （ 新 称 ）こ の う ち,Sv 刀 忽oteaac" 〃 は ， 北 米 ア ラ ス カ 南 岸 か ら 知 ら れ て い るSynido 苑 α なevisBenedictに 類 似 し て い る が ， ( 1 ) 頭 部 に 突 起 が な い こ と ， ( 2 ) 前 方 の 胸 節 間 の 隙 間 の な い こ と ， ( 3 ) 第 2 触 角 の長 い こ と ， ( 4 ) 腹 尾 節 後 端 が 鋭 く 尖 る こ と な ど に よ っ て 区 別 さ れ る 。ま たSymmiusplan 妬 は ， わ が 国 沿 岸 に 分 布 す るSy"" 加 妬caudatus と 類 似 す る が,(1) 体 が 短 いこ と ， ( 2 ) 各 胸 肢 が 太 い こ と ， ( 3 ) 体 色 が 黒 い こ と な ど に よ っ て 区 別 さ れ る 。な お ， 両 極 と も 完 棋 式 標 本 は 富 山 市 科 学 文 化 セ ン タ ー に 保 管 さ れ る 。InbothMayandAugust,1983,IhadchancestocollectmanyisopodcrustaceansinchiBayanditsneighbouringwater.IwatePrefecture,NorthernHonshu.IthaooedthatOtsuchiBayanditsneighbouringwater,IwatePrefecture,NorthernHonshu.IthapedthatMr.HiroshiHoshikawaoftheHokkaidoUniversityalsocarriedoutsamplingofmarineanimalsinthesameplaceinJune,1983,andhewaskindenoughtoplacehisisopodspecimensatmydisposalforstudy.Amongthesecollections,2newspeciesofthefamilyIdoteidaehavebeenfoundandwillbedescribedinthepresentpaper.Theenumerationofaltheisopodspeciescontainedinthesecolectionswilbemadeinapapertobepublishedlater.Beforegoingfurther,IwishtoexpressmythankstoProfessorSaburoNishimuraoftheKyotoUniversityforhiskindnessinreadingmanuscript,toMr.HiroshiHoshikawaoftheHokaidoUniversityforhisliberalityingivingmethechancetostudyhispecimens.ThanksarealsoduetoProfessorMasuokiHorikoshiandthescientistsandstudentsoftheOceanResearchInstitute,UniversityofTokyoforgivingmemanyusefulsugestionsandhelps.S" 〃 〃0 蛇 α α αita,n ．sp.(Jap.name:Togari-waraji-heramushi)Figs.1and2Materialexa 加 加ed:It(23.7mminbodylength),mouthofOtsuchiBay,coll.Hiroshi*ContributionsfromtheToyamaScienceMuseum,No ．3 号ワ ーＦ ｈ ＵN o b o r u N l J N O M U MHoshikawa,June15,1983.TypespecimenisdepositedatheToyamaScienceMuseum(TOYA-Cr-2364).Desc γ ゆ"on:Bdyblong,aut3.0imesalongwide.Cphalonrectgular,nteiobordestaigh ・Bodyclurewithbnspaf,clydenselypigmentedalongbothmarginalpartsandmedialpart.Eyesbig,situaedlateralyeachwithabout70smaloceli.Coxalpateinvsiblein蕊＝茎~（／〃Fig.1 ． 句ﾉIlt"eacu,n.spA ・Dorsalview;B･Firstantena;C.Secondantena;D.Rightmandible;E.Leftmandible;F.Outerlobeofirstmaxila;G ・Secondmaxila;H･Maxiliped;I,Uropd.(Al:Holtypemale).5 87 加0 眺 泌 〃oteidIsopoda 伽 》 〃Otvicﾉ 〃Baydorsalview.Firstantena(Fig.1B)composedof4segments;firstegmentlargeandround;secondandthirdsegmentsrectangular;terminalsegment,aboutwiceaslongasthethirdandwithl7 ～18pairsofaesthetascsonthemargin.Secondantena(Fig.1C)long,reachingthefourthperaeonalsomite;firstandsecondpeduncularsegmentshort,hirdandfourthsegments3timesalongasthescond,fithsegmentabout1.5timesaslongaswide.Flagelumcomposedof23segments.Rightmandible(Fig.1D)stou.Parsincsivacompsedof3teh;lacinamobilsnotchitnzed;apeniclebtwenlacinamobilsandprocesumolaris;procesumolariswdeandwithagroupofsetaeatdistalmargin.Leftmandible(Fig.1E)stout.Parsincisivacomposedof2teth;laciniamobiliscomposedof3teth;apeniclebtwenlacinamobilsandprocesusmolaris;procesusmolariswideandwithagroupofsetaeatdistalmargin.Firstmaxila(Fig.1F).Outerlobewith10 ～1tethathetip.や、Fig.2.Synit わ だ α αcuta.n.sp.A-G.PeraeopodsI-VI;H.Penes;I.PleopodIinmale(Al:Holotypemale).5 9NoboruNunomuraSecondmaxila(Fig.1G),Outerlobesubequalinegthandbreadth,bothaving15~18longspie;nrlobeasngoutern,adhving20spinead2stouplmosetaMaxilped(Fg.1H)Eosi;endtmalwh8puosenditalmargindacouplinghokinermagin ・Plpwe3-smetd;fstshot,secondsegmntrectangularndwithancuteprojecionadepconavityouterdistalprt.terminalsegmentroundandfringedwithmanysetae.PeraeopdI(Fig.2A).Basirectangularbutrelativelyshort;ischiumaslongasbasiandwith1seonrmagi;eustnlarcpustinglarwhbout10seoninermargin;propduswithswolenbaslpartandarowerdistalpart;dactyluslong.PeraopdsIT(Fig.2B-C)asobln;ichumretagw6 ～1setaonhmargin;merusalmotsquare;cpusrectangulrwith10 ～16tonhmi;podusoblngwithau20serm;dcy.PeraeopodsIV-VI(Fig.2D-F)similarinshape.Basisoblong;ischiumthre-fifthsaslongasthebasi;merusandcarpusbequalinshapendeachtwo-thirdsthelngthoftheIschium,wthmanysetaonhemargin;produstwiceaslongascrpus;dactylusong.PeraopdVI(Fig.2G)almostimlartoheprcedingthrepraeopds,butischumofthepraeopdVIlongerthanthatofperaeopdVI.Pens(Fig.2H)almostrectangular.Malescondpleod(Fig.2I)Stylusaongasthendop.Endopfur(Fig.1I)2-semt,nalwihbou8pmsetonthemargi.Plsontuarwihpedostrn.Remarks:TheprsentwspecismostcloseyaliedtoSy" 〃eaviBncfrmSouthernAlaska,butheformeriseparatedfromthelaterinthefolowingfeatures:(1)lackofprojectioncephalon,(2)lackofemarginationbetwenperaeonalsomites;(3)shortersecondantena,(4)acuterposteriorendofpleotelsonad(5)presnceofancuteprojectiononsecondpalpalsegmentofmaxiliped.S"imiuspi α 〃"sn ．sp.(Jap.nme:Hirta-yboheramusi,nw)Figs､3and4〃 上itenal 歓 秘 沈 加ed:1 早(partye,8.2minbodylegth),OsuciBay,0mnpth.col.Hirshoikaw,June15983;0$(1holtype,12 ．3mnbdylegtd$partypes,8.2 ～1 ．6minbodylength)andl 早 ￥(1 早alotype,12.minbodylengthand10 早 鼎,9.2 ～12.minbodylegth)OsucBa,4 ～5mindepth,col.Nbruaetal,Aug.20,1983.Typeseriesisdepositedasfolows:holotype(TOYC-Cr-2378),alotype(TOYA-Cr2379)andptyes(TOYA-Cr2380 ～238)atheToymScinMuse,4partyeshOceanRsrchIntiueofTkyUniversty;4pares(NSMT-Cr8973)atheNionalSceMusm,Toky4partyes(OMNH-Ar291 ～2914)atheOsMuseumofNaturalHistory,and4partypes(YCM-CI-860 ～863)atheYoksukaCityMuseum ，6 07 加oNewIdoteidIso 加 伽 β'omOtsucﾉ 〃Bayand5paratypesattheOceanResearchInstitute,UniversityofTokyo.Descrip 加 〃:Bodyelongateandepresed,about2.8timesalongaswide,andbroadestathirdpeonalsmite.Bdycolurbakishwtmnyregulapternsodalsurface.Pleonwith2distnctsomites.Pleotlsontriangularndlong,excedingoe-thirdofbodylength.Cpawirltsexnd.Eyma,chopsedf4lian脅塗壷認 “ 唾 易 《 掌尽 〆 ．、' 該= 側難 醗 B 一鍵 登 迩蕊. 、ﾔ ｰ 里 、鍵 ,謎 ． 『.L ・ 当prP_ 昌 一 一、葱 、密 噸_~ﾆｰ認 蕊： ‐ ￥ ル ー 報蕊 急 『 淳三､,、．．~．:･11 V = － ． J却 八i』/fl “ 『'ﾛ･郷I/片’ ⅢFig.3Sy 加 刀liusp 敗 れ"s,n.sp ．A ・Dorsalview;B.Firstantena;C.Secondantena;D.Rightmandible;E.Leftmandible;F ・Firstmaxila;G.Secondmaxila;H.Maxilped;I･Pens;J-N.PleopdsI-Vinmale.(A-C,F-H:Holotypemale,D-E.I-N･Paratypemale).61NoboruNunomurasituaedors-laterly.Firstanea(Fig.3B)compsedof4segmnts;firstohirdsegmntsalmostquare.fourthsegmentlongandwith12pairsofaesthetasconthemargin.Secondantena(Fig.3C)almostequalinlengthofirstansena,ndcomposedof6segmnt;firsegmntvry_shot,ecndofurthsegmnalostqure,fithandsxsegmentsrectangular.Rightmandible(Fig.3D)Parsincsivawth4eth;lacinamobilsnotchinzedanformsaingleaminlpate;6 ～7peniclsbetwnlacinamobilsandprocesumolaris:procesusmoralisrepresentedin3seratedsetae.Leftmandible(Fig.3E)Parsincvacompsedof3teh;lacinmobilscompsedof4teh;abou7peniclsbhdacinmobls;prceumolarisepntdi4sea.／ ／／HFig.4 ．Symiusplanus,n.spA-G:PeraopdsI-VI,H.Uropd.(A-G:Holtypemale,H:Partypemale)6 2Two ハ セ ” 〃0 花 ” たo 加 血_"gmOtsucﾉ 〃BayFirstmaxl(Fig.3)Outerlobwih9setaip,5ofwhciseratd;inerlobesomewhatshorterandnarowerthantheouterlobe,andwith2longplumosesetaeattheip.Secondmaxil(Fg.3G)Outerlobsueqalin'egthandbreth,wi2and4tehatheiprsectivly;inerlobshrteandwierthanouterns,having6hairyseta.Maxilped(Fig.3H)Enditelongatewih2robusthairj'setahetipandwithacouplinghokoninermargin.Palp5-segmented;firstandsecondsegmentsmal,thirdandfourthsegmentslargeandprotrudedinerwards,terminalsegmentround.Epipoditelipsoid.reachingteariculatonfhetirdanfourthsegmntsofpal.PeraeopdI(Fig.4A)subchelate.Basielipsoid;ischiumtriangular;merushort;carpussmal,tringuwh3smalprotubencsd3aoinermg;podusbtwith8stoutsetaeandseveralthinersetaeoninermargin;dactyluslong.PeraopdsI-V(Fig.4B-D)simlarinshape.Basioblngwithmanylongseta;ischumretangl;dpoqw5projectionsoninermargin.PeraopdsV-I(Fig.4E-)simlarnshpe.Baisoblng;ischumabothlfelengthofbasi;merustwo-thirdsthelngthofischium;carpusthre-fithslengthofthemerus;propdusalongasthoseofthepraeopdIV.PeraopdVI(Fig.4-G)simlartohepaodVI,butsmalerinsz.Pens(Fig.3I)shortandriangulr.PleopdI(Fig.3J).Endopdelipsoidwth18 ～20umeaeonemargin,adoneofthemisnlog;expdlongerthandop,with8 ～9putahm.Pleopdn(Fig.3K)maStyus,exopd;birectangularwith2hoks.PleopodsII-V(Fig.3L-N)oblong.Bothlamisubequalinlengthandwithsparselysetose.Uropod(Fig.4H).Basislongandstoutexpodandendopodoblongandsimilarinshape.Pleotelsontriangulaer,taperingtowardsthetip,andwith2longplumosetaethetip.Remarks:TheprsentwspecisloeyaliedtoSymiuscadｵ 妬Rchrsnbttheformerdifersfromthelaterinthefolowingfeatures:(1)shorterandwiderbody.especialyofabdomen,(2)robusterperaeopods,(3)shapeofbothantena,and(5)darkerbodycolour.Thenwspcieand5.c" 血"werbothcletdfromhesaby;thenwspcietend,howevrtbaundtihesalowrte,whilcaudtswercoltedfromdeperwater.ReferncesBendict,J.1983.ArevisonfthegnusSynitohea.Proc.Aad.Nat.Sci.Philad.,53part1:389-404.Brusca,R.CandB.RWalerstin,197.ThemarinesopdcrustacensoftheGulfo6 3NoboruNunomuraCalifornI.dteia;nwgusdpeci,rangxtesioandcmetsovlu-tionadtxonmywithnefamily.Proc ・Biol.ScWashingto,92():253-71.Colinge,W.E.,1917.,ArevisionoftheBritishIdoteidae,afamilyofmarineIsopoda.Trans.R.Soc.Edinb.,51:721-760.Kusakin,0.G195Kvoprsuitemaknro'yhvid 〃 “ んeaFbr.(Isopda,Valvifera)dlnevostchnykhmoreiSR.Trud.Zol.Inst.Lenigrad28:19-27.,1973Peculiartiesofthegoraphicalndverticaldistrbutionfmarinesopdsantheproblemofde-seafunaorign.23:19-34.Naylor,E.195.ThecompartivemorphlogyandrevisdtaxonmyofBritshpecisofIdotea,Jour.Mar.Biol.Ass.U.K.34:407-497.Richardson,H.1904CtbueNlyfIpPUSMus.,27:1-13.,1905.MongraphofteIsopdfNorthAmerica.Bul.USNat.Mus,54:1-72.Shino,S.M1965.NewIlustraedEncylopediaoftheFaunofJapn2:541.Hokurykan(inJapnes).Thielman,M.190BtrgzuKsdIopfOAkderWisenchaften,Michen,Supl.2(3):1-06 4

Two new idoteid Isopoda from Otsuchi Bay, northern Japan

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Two new idoteid Isopoda from Otsuchi Bay, northern Japan

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