A new species of the genus Glossobius
(Isopoda, Cymothoidae) from coetid fish caught in the sea near Tokyo, Japan
journal or
publication title
Bulletin of the Toyama Science Museum
number 24
page range 29‑32
year 2001‑03‑25
URL http://repo.tsm.toyama.toyama.jp/?action=repos
itory̲uri&item̲id=762
ANewSpeciesoftheGeImsα 〃 (Isopoda,Cymothoidae>
fmmcoetidnshcaughtintheseanearTokyO,Japan *
NoboruNUNOMURA TovamaScienceMuseum
l‑8‑31,Nishinakano‑machi,Toyama‑shi,939‑8084JAPAN
タカベに寄生するG/ossb/us属(甲殻綱;等脚目)の一新種
布 村 昇
富山市科学文化センター〒939‑8084富山市西中野町1−8−3瓦
伊豆諸島ならびに東京湾産のタカベLα〃α g/ sαα電e""ve" sに寄生していたG/ ob 属のウオノエが採集されたが,本種は小笠原諸島沖産ヒメアカトビウオロの腔から知られてい
るGogasaware"sjsと最もよく類似するが,(1)腹尾節後縁が丸いこと,(2)体が小さく太いこ
と,(3)尾節の両肢が細いこと,(4)顎脚が狭いこと(5)第2触角の節がより多いことで相違す る。また,本種は大西洋フロリダから知られているGルe耐"αhα"2ph〃Williams&Williams,1985 とも類似するが(1)体が短いこと,(2)目が大きいこと,(3)第1触角の節数が少ないこと,(4)第2触角の節数が多いこと,(5)第2小顎の歯が少ないこと,(6)尾節の両肢が細いこと,(7)
胸 節 の 基 板 が 小 さ い こ と な ど で 区 別 さ れ る 。
キーワード:G/ so6 ,新種,ワラジムシ目,等脚目,ウオノエ科,魚類寄生,タカベ
Hitherto,8speciesofthegenusG/Cs o6jzィshavebeenrepolted,butonlyonespeciesfTom Japananditsneighboringseas,RecentlvsomespeclmenswerecollectedfTommouthofthecoetid fish,Labγα g/o αα電e加岬e"〃心ThisspeciesismostcloselyalliedtoG/ 6畑sog αw e"sJs Nunomural992,reported廿omthemouthofexocoetidflyingfish,Qpse/"ノWSα"gzイsrc印s,butthe
fbrmerlsseparatedけomthelatterinthefbllowingfeamres:(1)roundedandnarrowerpostenor
marginofpleotelson,(2)smallerandstouterbodvshape(3)naITowerramiofuropod,(4)nalTowrermaxillipedand(5)moresegmentsofantennaThisspeciesisalsoallliedtoG
he脚〃αル脚phjrecoredfTomtheexocoetidfiShinFloridabutthefbnnerlsseparatedけomthelatter inthefbllowingfeamres:(1)shorterbody,(2)biggereye,(3)moresegmentsofantennule,(4)lessnumeroussegmentsofantenna,(5)lessnumerousteethonmaxilla,(6)slendererramiof
uropodand(7)weakereplmeraonpereonltes・Keyword:G/o o〃 ,newspecles,parasiticlsopoda,Cymothoidae,Cymothoidea.
G〃 ⑪6畑sa減加αe平〕.〃0W.
( F i g s 、 1 ‑ 2 )
l早(holotvpel96rIminbodvlen2th)andld
MJre"αノexα " :1早(holotypel96mminbodylength)and1ケ(allotype,10.3mminbodylength),fTomthe hofthefish,Lab・acogノo αα堰e""ve""jsPeters(164.0mminbodylength,male)caught廿omtheseaoff mouthofthefish,Lab・acog/o αα7宮e"r"e"〃jsPeters(164.0mminbodylength,male)caught廿omtheseaoff Ohshima,TokyoPrefecmre,June,4,1992,collTaekoArima:l早(l85mminbodylength)1ケ(58mminbody length)fTomtheanotherindividualofthesamespecies,samedata,;l早(209mminbodylength)and1ケ(7.5mm、
*ContributionfromtheToyamaScienceMaseumNo、249
ワム
NobomNUNOMURA
b o d y l e n g t h ) f T o m t h e a n o t h e r i n d i v i d u a l o f t h e s a m e s p e c i e s , s a m e d a t a ; U t o n e ‑ s h i m a T o k y o p r e f e c m r e , S e p 2 9 , 1 9 9 2 1早(22.2mminbodylength)and2mancas(4.4and4.9mminbodylength);Zenisu,Tokyoboy,June27,1992,1 3(9.5,皿ninbodylength)l早(20.2mminbodylength);Zenisu,TokyoBoy,June27,1992,1J(lLlmminbody
Fig.1.FemaleofG/ 6j"s J脚aesp・nov・
AandB:Dorsalview.C:Lateralview.D:Ventral E:Antennule.F:Antenna.G:Mandible.H:Maxillula・
Pereopodsl〜7.R:Uropod(A,D〜R:Holotype,B
A〜C、
vlewofantenorpartofcephalon.
I:MaxillaJ:MaxillipedK〜Q:
andC:paratype).BarfbrFig、1
length)l早(248mminbodylength).Holotype(TOYACr‑12844),allotype(TOYACr‐12845)and9paratypes (TOYACr‑12846〜12854)aredepositedattheTovamaScienceMuseum
Descrや"o〃Q/た腕αノe・Bodv2、6timesaslongaswideCephalonalmostaslongaswide,ColordullyellowBodv twistedslightly(FiglAandB).Eyesmediocreinsize,eacheyecomposedofaboutlOOommatidia、Antennule(Fig lD)andcontlguousatbasalpartandcomposedof7segments・Antenna(FiglF)alittlelongerthanantennule,and composedof8segments,Mandible(Fig.1G)palp,with3teeth;palpthree‑segmentedtenninalsegmentwith2setae atthetipMaxilluia(FiglH)slenderwith4teethatthetipMaxilla(Fig.11)widewith8〜l2recurvedsmall s p m e s 、 M a x i l l i p e d ( F i g l J ) w i d e a n d p a l p 2 ‑ s e g m e n t e d ; f I r s t s e g m e n t r e c t a n g u l a r ; t e n n i n a l s e g m e n t s m a l l w i t h o u t s e t a inholotypebutwith2smallteethatthetipinanotherparatypespecimenPereopodsl〜7(FiglK−M)almostsimilar
inshape,butpereopods4〜71argerthantheperopodsl〜3:basisbigandalmostround;ischiumrectangular;merusshort;camusveryshort;propodusstout;dactylusrecurvedandreachesthemiddleareaofcalpus・Uropod(FiglR)白 basispentagonal,bothramilanceolate;sub‑equalinlength.
D crjp"o〃qf'"α/a・Remarkablysmallerthanfemale・Body21〜2.4timesaslongaswideandnotremarkably
遁 亙 J 錘 > ,
( ' j
I〜一一一一 11 ト ー 一 一 計
L 一 一 一
−−−−コ
シーし一 − 〜 )
I章 いいゞ︑︲
一へ 一一
しし ︑︒︑︲︲Ln亜臣叩凹己一F邑一浄唾かJIll
〆<−−、
「〜
L 1
m 、
〈 ‑ 〜 r 、
齢
一 − − − ̲
//″︑
/ ‐
IF
Fig.2.MaleofG/ so〃"sα灯加aesp・nov、
AandB:Dorsalview.C:VentralviewofanteriorpaItofcephalon.D:Antennule・E AntennaF:MandibleG:MaxillulaH:Maxillal〜O:Pereopodsl〜7.P:Penes.Q〜R
Uropod(A,C〜R:Allotype,B:paratype).BarfbrFig2A−B
31
NobomNUNOMURA
twisted(Fig.2A‑B).Colordullyellow・Cephalo、0.46〜0.63timeaslongaswide・Eyesmediocreinsize,eacheye composedofaboutlOOommatidiaAntennule(Fig2D)contlguousatbasalpartandcomposedof7segmentsAntenna (Fig2E)alittlelongerthanantennule,andcomposedof8segments、Mandible(Fig2F)palpwith3teeth;palpthree‐
segmented・Terminalsegmentwith2setaeatthetip、
Maxillula(Fig2G)slenderwithastrongerand3teethatthetipMaxilla(Fig2G)widewithlO‑l2recurved smallspines・Pereopodsl〜7(Fig.21〜O)almostsimilarinshape,butpereopods4〜71argerthantheperopodsl‑3:
basisbigandalmostround;ischiumrectangular;merussholt;carpusveIyshort;propodus;dactylusrecurvedand reachesthemiddleareaofcamus,Penesstout(Fig2P).Uropod(FigQ〜R):basispentagonal,bothramlnarrow,
exopod3、7〜4.4timesaslongaswide,endopodalittlelongerthanexopod,3.9timesaslongaswide・
Re碗 肱.・ThepresentspeciesismostcloselvalliedtoG/o o6j 09 αw e"sjsNunomuea,1992,reportedfiom themouthofexocoetidnyingfish,q¥'se/"r"sα"9脚srceps,butthefbrmerlsseparated師mthelatterinthefbllowing 従amres:(1)roundedandna面owerposterlormarginofpleotelso、(2)smallerandstouterbodyshape,(3)、a汀ower ramiofuropod(4)narrowermaxillipedThisspeciesisalsoalliedtoG、he〃"αル"1p力jWilliamsandWilliams,l985 recordedfTomtheexocoetidflshinFloridaButthefbnnerisseparatedhomthelatterinthefbllowingfbatures:(1)
shorterbody,(2)biggereye,(3)moresegmentsofantennule,(4)lessnumeroussegmentsofantenna,(5)lessnu‐
merousteethonmaxilla,(6)slendererramiofuropodand(7)weakerepimeraonpereonites.
Re娩rences
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1 0 ( 1 1 ) : 1 ‑ 3 2 , p l s ・ l l − 5
Bowman,T、E、1978.NomenclaturalProblemsintheCymothoidIsopodGeneraC〃 oα,CO(わ"Op〃/"s,G/ 〃"s α"JA化j" "α・・theirSlutionbyApplyingtheLawofPriority・Cr"sraceα"α,34:217‑219.
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