A new species of the genus Dynoides (Isopoda:
Sphaeromatidae) from Shiretoko, Hokkaido, northern Japan
journal or
publication title
Bulletin of the Toyama Science Museum
number 33
page range 65‑69
year 2010‑03‑15
URL http://repo.tsm.toyama.toyama.jp/?action=repos
itory̲uri&item̲id=919
富山市科学博物館研究報告第33号，pp65‑69；（2()10）
ANewSpeciesoftheGenuSny"0j火§（Isopoda：Sphaeromatidae）fmm Shiretoko，Hokkaido，NorthernJ我pan＊
NobomNunomura ToyamaScienceMuseum
l‑8‑31Nishinakano‑machi，Toyama939‑8084，Japan
北海道知床から発見されたシリケンウミセミ属（等脚目:コツブムシ科）の1新種
布 村 昇
富山市科学博物館
939‑8084富山県富山市西中野町1‑8‑3：
北海道知床半島で行われた「環境省による知床半島沿岸域における浅海生物相調査」
で五鴫聖二氏らが採取した等脚類の標本を調査したで中でコツブムシ科の1種が未記 載種であることが判明し，新種、)ﾉ"｡』昨s〃 /0，〔和名：ソメワケウミセミ，新称〕
として記載した。本種はシリケンウミセミ、),"｡/火s火""s"""s助e"と類似するが，
(1)体の前半が黒く，後半が白いこと，（2）胸部後縁中央部にある突起が短いこと，
(3)腹尾節後端の湾入が浅いこと，（4）触角が短く，それを構成する鞭数も少ない こと，(5)目が小さいこと，（6）第2小顎内肢に鋸状の歯があること，(7)第1胸脚が太 く短いこと，(8)第一小顎内の剛毛数が少ないことなどで区別される。本種のホロタ イフ．は富山市科学博物館に保管される（TOYACr‑l9971)。
キーワード：等脚類、新種、北海道、知床、ソメワケウミセミ
Keywords：Isopod，newspecies，Hokkaido，Shiretoko，Dy"Cl北s〃CO/o〆
DuringthesurveyentitledIFaunaandflorasurveyprQJectoftheshallowseaalongtheShiretokoCoast'1，Prof Goshimaandhiscolleaguescolletedmanylsopodcnlstaceans，togetherwithmanygroupsofanimalsandp'ants、They weresenttOmefbridentiflcationandamongthem，Ifbundstrange‑lookingspecimensofthefamilySphaeromatidae・ Atc,｡serexaminatiOnsOfmine，theyprovedtorepresentanewsPeCiesofthegenusDw7oj火s・AndIdescribeditas anewspecies,Dy"成咋s6jco/･『・TheholotypewillbedepositedattheTovamaScienceMuseum（TOYACr'9971)・
Orderlsopoda SuborderSphaeromatidea
FamilySphaeromatidae Dwz〆咋s〃 ﾉ0『n．sp・
（Japanesename：Somewake‑umisemi，new）
（Figsl‑2）
Mbre"αノexa,"加ed：1J（hOlotype，46mminbodylengthandl早（allotyPe，3．8mminbodylength)ゞ ChashikOtsu，Shari‑cho，Hokkaido，June16，2008，coll，SeﾘiGoshimaTypeseriesisdepositedasfb''oWS：holotype
(TOYACr‑l997,）attheToyamaScienceMuseum；aⅡotype(OMNHAr‑7777）attheOsakaMuseumofNamra'His‐
t o r y ．
＊Contributions廿omtheToyamaScienceMuseum，No.384
6 蕊
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Fig.1町"ojI九s〃 んFⅢ.§p，
A，Dorsalview；B Antennule，C，Antenna；D，
OuterlobeofmaxillulaぅH，Innerlobeofthe uropod；P,Pleopodofthesame（All,Holotype
FrontallaminaandclypeusラE，Rightmandible；F，Lefimandible；G，
same；I，Maxilla；J，Maxilliped；K−N，Pleopodsl‑5；O，Endopodof
m a l e ) ．
AnewD)ﾉ"CiC左sfi･omShiretoko
Descrjp"o":Body（FiglA）L7timesaslongaswideColorofpereonalsomitesl‑5blackandtheremainingpart almostwhite，Threesumrelines･Eyesrelativelysmall，eacheyecomposedof75ommatidea，Anteriormarginof cephalonslightlyprotruded；posterlormargmrounded、Pereonalsomitealmostparallel，Posterlormarginwithashort androundedprQjectioninamedialpartPosterlorendofpleotelsonwithasmallroundedconcavltv・
Antennule（FiglB)：peduncle3‑segmented；Hagellum5‑segmerntedAntenna（FiglC)：peduncle5‑segmented；fla‐ gellum9‑segmentedFrontallamina（FiglD）triangular;clypeusroundedRightmandible(FiglE):parsincisiva4‑headedラ laciniamobilisweakly6toothed；processusmolariswide；palp3‑segmentedandtenninalsegmentwithaseriesof shortsetaeLefimandible（FiglF):parsincisiva4‑headed;laciniamobilis3‑toothed;processusmolariswide､MaxiⅡula： lnnerlobe(FiglH)with4plumosesetae；outerlobe(FiglG）withl2teethMaxilla（Figll)；innerlobewith8teeth,2 0fthemserrate；1nnerramusofouterlobewith7setaeandouterramusofthesamewith3setaeondistalmargln・
Maxilliped(FiglJ)：enditelateralmarglnstraight,withacouplinghook，terminalmargln，withl6‑l7plumosesetae， outermargmroundedラpalp5‑segmente｡；segmentlrelativelyshortandrectangular；segment2big，3．4timesaslong assegmentl，with7‑8setaepmdistalhalfofinnermargln；segment30､4timesaslongassegment2，with7‑8setae onlnnerdistalarea；segment4slender，1．3timeslongerthansegment3and65％aswideassegment3，with7seg‑
mentwithinnerdistalarea；terminalsegmentslender，0．8timesaslongasandO､4timesaswideassegment4，with
4setaeatthetip．
Fig.2Dy"0j た＄〃 んr、.§p・
AC‑G,Pereopodsl‑7（A,C‑G,Holotypemale；B，Allotype企male）
67
ー
NobomNunomura
Pereopodl(Fig2A）relativelyshoIt:basisl5timesaslongaswide,with2setaeonlnnermarglnandasetaat 1nnerdistalangleラischiumalmostaslongasbasis，with6‑7shortsetaeonlnnermarginandaseriesofmorethan20 setaeonoutermarg1n；me,us0．35timesaslongasischium，with・carpusshortandtriangular；propoduswithastrong setaatlnnerdistalangleandmanyshortsetaeonlnnermargln：propoduswith3pegsandsomesetaeonlnnermargln Unfbrtlmatelypereopod2inmalelackingPereopod2(Fig2B）infbmalesslender:basis4timesaslongaswide息 ischiumO､8timesaslongasbasis，；merusO,4timesaslongasischium，withasetaatlnnerdistalangle；carpus twicelongerthanmerus;propodusaslongascamus,withatriangularpr可ectionatmnerdistalangle・
Pereopod3（Fig2C):basisunfbmnatelymissing;ischium3・ltimesaslongaswide;merus・O4timesaslongas ischium，withalongsetaonlnnerdistalangleandonoutermargln；calpustwicelongerthanmerusjpropodusa littleshorterthancaIpus，withmanysetaeonbothmarglns・
Pereopod4（Fig2D):basis26timesaslongaswide；ischiumalmostaslongasbasis,withasetaatmnerdistal angle；merus55％aslongasischium，withmanysetaeonlnnermargm，alongsetaneardistalangle.；carpus85％
aslongasmerus，withalongsetaenearlnnerdistalangleandouterdistalanglesnearouterdistalangle；propodus 1.8timeslongerthancamus、
Pereopod5（Fig2E):basis33timesaslongaswide；ischium75％aslongasbasis,；merus0．4timesaslong asischium，withmanysetaeonbothmargms；carpusaslongasmerus，withmanyrelativelylongsetaeonlnner margmandmorethen25setaeonoutermargm；propodus2､2timeslongerthanmerus，withmanysetaeonboth
marglns、
Pereopod6（Fig2F):basis3Jtimesaslongaswide,ischiumalmostaslongasbasis,merus0．4timesaslong asischium，withmanysetaeonmnermargln；carpusaslongasmerus，withmanysetaeonmnermarglnぅpropodus
1.9timeslongerthancalpus，withmanvsetaeonmnermargm・
Pereopod7（fig2G):basis45timesaslongaswide；ischiumaslongasbasis；memshalfthelengthofischium，
withlongsetaatouterdistalangle；calpusaslongascamus，withmanysetaeonmnermarginandalongsetaatouter distalangleラpropodus1．25timeslongerthancarpus，withmanysetaeonlnnermargln・
Penesunfbrtunatelvinvisibleormissing，
Pleopodl（FiglK)：endopodwith21plumosesetaearoundthemargmstyluslong,withbendinginthemiddle part，withl5setaeラexopodtriangular，withl5setae、
Pleopod2（FiglL)：endopodrectangularwithabout25setaearoundthemargln；styluslongtaperlngtowardthe
t 1 p 、
Pleopod3（FiglM)：endopodtriangular；exopodlanceolate
Pleopod4（FiglN)：endopodlanceolate，withpleats；exopodlanceolate，
Pleopod5（Fig，llO)：endopodwithpleatsand2bosses；exopodwithaboss Uropod;endopod（FiglP)：lanceolateExopod.（FiglQ）slightlysmallerthanendopod E〃胴o/o邸ﾉ：mbi1'meansI1two11inLatinand1'color11means1IcolorwinLatin・
Re碗αr肺：Hitherto，slxspeciesofthegenusDy"oi火s廿omJapananditsneighboringareas（KimandKwon，l985o KimandKwon，1988，Kussakin，1979，KwonandKim，1986，She､，1979)．Amongthem，thepresentnewspeciesis mostcloselyalliedtoDy"oj火s火"r師""sShen,butthefbnnerseparated伽、thelatterinthefbllowingfeamres:（lI characteristiccolorpattems,（2）shorterprQjectiononmedialareaofpereonalsomite,（3）shallowerconcavltyonmedial partofpleotelson,（4）lessnumeroussetaeofbothantennae,（5）smallereyes,(6)presenceofserratedsetaeonmaxilla．
(7)stouterpereopodland（8）lessnumerousteethonmnerlobeofmaxillula
Iwouldliketoexpresさ florasurveyprQjectofthe suchinterestlngspeclmens
ronlnent．
Acknowledgements
myslnceregratimdetoProfSeﾘiGoshimaandhiscolleagues,membersoftheFaunaand shallowseaalongtheShiretokocoastI1fbrtheirkindnesslngivingmechancetoexamlne ThissurveywasconductedbythefinancialsupportoftheJapaneseMinistryoftheEnvi‑
AnewD oi【たs，廿omShiretoko
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