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

ToyamaScienceMuseuml‑
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，ProfGoshi
maandhiscolleaguescolletedmanylso
podcnlstaceans，
togetherw
ithmanygrou
psofanimals
andp'
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‐tory．

＊Contributions廿omtheToyamaScienceMuseum，No.384

6蕊NoboruNunomura蚤

‑‑
可．

§］m、／

一

１１︑．・・・・・・・．．．︲服″″服︲︲鋤御柳卿卿柵剛郷卿孤蝿膿畢恥熱

畔

一報

１１一一、ｒｌｌｌｌしに帳げい

Ｉｉ１ＩＩＩ：＃︲ず蕊一節職/{…

Fig.1町"ojI九s〃 んFⅢ.§p，

rontallaminaandclypeusラE，Rightmandible；F，Lefimandible；G，A，Dorsalview；B Antennule，C，Antenna；D， F

ame；I，Maxilla；J，Maxilliped；K−N，Pleopodsl‑5；O，Endopodof
OuterlobeofmaxillulaぅH，Innerlobeofthe sale)．
uropod；P,Pleopodofthesame（All,Holotype m6篭AnewD)ﾉ"CiC左sfi･omShiretoko

Descrjp"o":Body（FiglA）L7timesaslongaswideColorofpereonalsomitesl‑5blackandtheremainingpartalmostw
hite，
Threesumrelines･
Eyesrelativelys
mall，
eache
yecom
posedof75om
matidea，Anter
ior
marginofcephalonslightlyprotruded；
posterlormargmrounded、Pereonalsomitealmost
parallel，
Posterlor
mar
ginw
ithashor
tandroundedpr
Q
jectioniname
dialpart
Posterlor
endofpleotelsonw
ithas
mallroundedconcav
ltv
・
Antennule（FiglB)：
peduncle3‑
segmented；Hagellum5‑
segmerntedAntenna（FiglC)
：
pedun
cle
5‑
seg
mented；
fla‐
gellu
m
9‑
seg
mentedFron
tallamina（FiglD）
tr
iangular;clypeusroundedRight
mandible(FiglE):
parsincisiv
a4‑headedラ
laciniamobilisweakly6toothed；processusmolariswide；palp3‑segmentedandtenninalsegmentwithaseriesof
shortsetaeLefi
mandible（FiglF):
parsincisiv
a4‑
headed;laciniamobilis
3‑toothed;processusmolariswide､MaxiⅡula：lnnerlobe(FiglH)with4plumosesetae；outerlobe(FiglG）withl2teethMaxilla（Figll)；innerlobewith8teeth,20fthemserrate；1nnerramusofouterlobewith7setaeandouterramusofthesamewith3setaeondistalmargln・Maxilliped(FiglJ)：enditelateral
marglnstr
aight,w
ithacouplinghook，
ter
minalmargln，w
ithl6‑l7plu
mosesetae，
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，with4setaeatthetip．

ー

Fig.2Dy"0j た＄〃 んr、.§p・AC‑G,Pereopodsl‑7（A,C‑G,Holotypemale；B，Allotype企male）

67

NobomNunomura

Pereopodl(Fig2A）relativelyshoIt:basisl5timesaslongaswide,with2setaeonlnnermarglnandasetaat
1nnerdistalangleラischiumalmostaslongasbasis，with6‑7shortsetaeonlnnermarginandaseriesofmorethan20
setaeonouter
mar
g
1n；
me,
u
s
0．
3
5t
i
me
s
as
lon
g
as
i
s
c
h
i
u
m，
w
i
t
h・
c
ar
pu
s
s
ho
r
t
andt
r
i
an
g
u
lar；
pr
o
podu
s
w
it
hastr
on
g
setaatlnnerdistalangleandmanyshortsetaeonlnnermargln：propoduswith3pegsandsomesetaeonlnnermargln
Un
fbr
tl
matelyper
eopod2inmalelackingPereopod2(Fig2B）
infbmalesslender
:
bas
is
4t
i
mes
aslon
gasw
ide
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％
aslongasmer
us，
withalongsetaenearlnnerdistalang
le
an
dou
ter
dis
ta
lang
lesne
ar
ou
ter
distalangle；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，withmanysetaeonmnermarginandalongsetaatouterdistalangleラpropodus1．25timeslongerthancarpus，withmanysetaeonlnnermargln・Penesunfbrtunatelvinvisibleormissing，

Pleopodl（FiglK)：endopodwith21plumosesetaearoundthemargmstyluslong,withbendinginthemiddle
part，withl5setaeラexopodtriangular，withl5setae、
Pleopod2（FiglL)：endopodrectangularwithabout25setaearoundthemargln；styluslongtaperlngtowardthet1p、

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:（lIcharacteristiccolorpattems,（2）shorterprQjectiononmedialareaofpereonalsomite,（3）shallowerconcavltyonmedial
partofpleotelson,（4）lessnumeroussetaeofbothantennae,（5）smallereyes,(6)presenceofserratedsetaeonmaxilla．
(7)stouterpereopodland（8）lessnumerousteethonmnerlobeofmaxillula
Acknowledgements

Iwouldliketoexpresさ myslnceregratimdetoProfSeﾘiGoshimaandhiscolleagues,membersoftheFaunaand
florasurveyprQjectofthe shallowseaalongtheShiretokocoastI1fbrtheirkindnesslngivingmechancetoexamlne
suchinterestlngspeclmens ThissurveywasconductedbythefinancialsupportoftheJapaneseMinistryoftheEnvi‑ronlnent．

6鷺AnewD oi【たs，廿omShiretoko

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Kim,HS＆DHKwon，1988a､Marineisopodcrustaceans伽mChQiulsland,Koreae､ﾉひ"r"α44(1)：l95‑220
Kussakin，0．
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979．
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6雷