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A new species of the genus Glossobius (Isopoda, Cymothoidae) from coetid fish caught in the sea near Tokyo, Japan

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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

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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:(1shorterbody2biggereye3moresegmentsofantennule4)

lessnumeroussegmentsofantenna,(5)lessnumerousteethonmaxilla,(6)slendererramiof

uropodand7weakereplmeraonpereonltes

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

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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

(4)

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;merus

short;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

〜 )

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 、

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

(5)

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

Bovallius,C、1885.NeworlmperfectlyKnownlsopoda,I:Bjhα"g〃〃Kひ"g/噌aS1ノe"ska叱re"s施火 e"sHtJ /腕gar,

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.

Bruce,NandT.E・Bowman,1989.SpeciesoftheParasiticlsopodGeneraCe7 方oaandG/ so〃"s(Crustacea:

Cymothoidae)廿omtheMouthsofFlyingFishesandHalfbeaks(Belonifbnnes).針""ルo"jα〃CO""め""o"sl o

ZboIogフノNo.489:1‑28.

Brusca,RCl981・AMOnographonthelsopodCymothoidae(Crustacea)oftheEastemPacificZoo/ogjcaノル"r"α/

offルeL加"eα〃Socje〃73(2):117‑1990.

Kensley,B・andM・Schottel989・GuidetotheMarinelsopodCrustaceanofCarribbean.S胴"ルo"jα〃ノ"s/・P7e

〃ノルj"gro",,.C、1‑308.

Kussakin,0.G.1976.MarineandbrackishwaterlsopodaofcoldandtemperatewatersoftheNorthemHemisphere l,SuborderFlabellifera4kα火"り'Q/5℃je"ceUS.S、RLe"加gra乱1‑470(inRussian).

Nunomura,N・'992.ThreeCvmothoidlsopodscollected廿omtheseaoff、theBoninlslands.B"".7byα碗α5℃/Mカイsl5:

35‑45.

Nunomura,N1995.Isopoda,inGuidetoSeashoreanimalsofJapanwithColorPicmresandKeys(ed.)SNishimura VolⅡHoikusha,Osaka(inJap).

Richardson,H、1905.AmonographofNorthAmerica.β""・US.ⅣtJr,疏sr.〃"s、54:1‑724.

Schioedte,』.C・andF・Meinert・ 883.Symbolaeadmonographiumcvmothoarumcrustaceorumisopodumfamily,ⅡI:

Saophridae、1V・Cerathoinae.N "γ""o"sk ぬs灯拡Series3/13:281‑378:pls,11‑16.

Shiino,SMl9510ncymothoidisopodaparasiticonJapanesefishes.B"〃qfJtZpα"eseSocie〃Q5℃ie"r抗cFisherejes,

16:81‑89.

Thilemann,M1910.BeitragezurKenntnissderisopodenfaunaOstasiens、46方α"〃.〃' 方.J〕" 〃 s,β e'.』 メ 耽皿SuppL2(3)Bd21‑110・

Trilles,J・P・andA、Raibaut,1973.SurlesCymothoidae(Isopoda,FlabeliferaparasitesdepoissonsmarimsdeTunisee.

B""、Mifs.〃jsr.Ⅳ .Paries3cser、114,Zoo1.88:273‑281.

Williams,E,H,Jr・andL.B・Williams1983.AnewCvmothoidlsopodGkso6加sルe〃〃ル97"phjfTomitsmouthofthe

BaⅡyhoo,〃e耐"ルα"p方"s6'"jem(Linnaeus)(Exocoetidae)intheCaribbeanSeaCr"srαα"α48(2):147‑152.

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