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A new species of the genus Aega (Crustacea Isopoda) from the sea off Okinawa

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A new species of the genus Aega (Crustacea Isopoda) from the sea off Okinawa

journal or

publication title

Bulletin of the Toyama Science Museum

number 12

page range 19‑22

year 1988‑10‑31

URL http://repo.tsm.toyama.toyama.jp/?action=repos

itory̲uri&item̲id=557

(2)

ANewSpeciesoftheGenusA a(Crustacealsopod漣

fromtheSeao征Okinawa*

NoboruNunomura TovamaScienceMuseum

グソクムシ科等脚目の一新種、A2grzg狸加彪()α"αの記載

布 村 昇

富山市科学文化センター

沖縄本島糸満市沖から採集されたグソクムシ科(甲殻類、等脚目)の1種を新種A電、

g増"I彫0 j〃(和名:メダマグソクムシ)として記載した。本種は北大西洋から知られてい るA2gnひ かりsαCarsと類似するが(1)腹尾節各節が広いこと(2)尾節の先端が丸い こと、(3)両複眼が大きく、また接していること、(4)胸節基板があまり、発達しない こと(5)第一触角が短いこと、(6)第二触角が長いこと、(7)オスの第二腹肢の交尾 針がまつすぐに伸長すること等によって区別される。

Someaegidspeclmenswerecollectedintheseaoffltoman,OkinawalslandSouthern lnandtheyweresenttomebythecoutesyofDr.HSekiguchi,MieUniversity,Thenar

Japanandtheyweresenttomebymecou[esyoIur.r1.Delfl8uc111,lvLにLノ111vc1・lLy,皿に↓』

thecloseexaminationsofmine,theyprovedtoberepresentanewspeciesbelongingtothe

genusA2g"・

Beforegoingfurther,IwishtoexpressmyslnceregratitudetoDIHideoSekiguchifox

o f f e r i n g m e t o e x a m m e s u c h i n t e r e s t l n g s a m p l e s .

Aegag〃α肥teoc邸Iasp.、0V.

(Jap,name:Medama‑gusokumushi,new)

Figs,land2

〃"たγ/α/9m"z伽 :5伊訊(l3holotype,16.8mminbodylengthand4ざ'3paratypes,

121162mminbodylength)andlallotype,10.3mminbodylength),fromtheseaoff ltoman,40mindepth,OkinawalslandcollHideoSekiguchi,July1985Typeseriesis depositedasfollowsholotypeTOYACr7647)allotypeTOYACr7648and2paratype (TOYACr76497650)attheToyamaScienceMuseum,aparatype(OMNHAr3254)atthe OsakaMuseumofNaturalHistoryandaparatype(NSMT−Cr9388)attheNationalScience

Museum,Tokyo・

DescγBodyovate29timesaslongaswidePleonnotmuchnarrowerthan

p e r e o n , E y e s v e r y l a r g e a n d c o n t l g u o u s , e a c h e y e c o m p o s e d o f a b o u t l 8 0 o m m a t i d i a 、

Anteriormarginofcephalonnotproducedaremarkablerostrum.

*ContributionsfromtheToyamaScienceMuseum,No.7も;

19

(3)

NoboruNunomura

6Jr

Fig.1Aggzzgzgrz郡 〃sp・nov.

A、Dorsalview;B・Mandible;C、OuterlobeofmaxiⅡule;DMaxillaiEMaxil‐

liped;F・Penes;GPleopodl;H,Pleopod2(All:Holotypemale).

AntennuleFig.2Awithpeduncularsegmentlalmostsquaresegments2and3

r e c t a n g u l a r ・ F l a g e l l u m c o m p o s e d o f l 3 〜 l 4 s e g m e n t s 、

AntenntaFig2B),reachingthemiddlepartofthe5thpereonalsomlteFlagellum

composedof30ommatidea、

MandibleFiglB)Parsincisivastrongandcomposedofasingletoothlacinia mobiliscomposedof5smaspinesPalpcomposedof3segmentedsegmentloblong segment2slightlyaslongasthelstsegment30,7timesaslongasthesecond,bearingabout

l9spinesonoutermargln・

Maxillule(Fig.1C)outerlobewith8teethatthetip

Maxilla(FiglD);ilmerlobenarrowwith3spines;outerloberatherstoutandwith5

(4)

、 /

イダダ

一二札/く

琴一一一

︑一一

一一

I 聯

Fig.2.A増ngZgzz〃/ /αsp・nov・

AAntennule;B・Antenna;CI・Pereopodsl 7;J・Uropod(All:Holotypemale》。

robustsD1nes、

Maxilliped(Fig.1E);enditesmall・Palpwelldevelopedand4‑segmented

Pereopodl(Fig.2C);basisoblong;ischiumtriangular;merusrectangularwith2spines

oninnermargm;carpusshort;propodusanddactylusformasubchelateform、

Pereopods2and3(Fig.2D−E);basisoblong;ischiumtrlangular;merusrectangular with2〜4spines;carpussquareandsmall;propodusanddactylusformsasubchelateform・

Pereopods4〜7(Fig.2F‑1)ambulatoryandincreasinginlengthposteriorly;basisstout;

ischiumoblongandtapermgtowardthedistalend;merusrectangularandshorterthan ischium;carpusrectangularbutnarrowerthanmerus;dactvlussimDle・

Penes(Fig.1F)pairedandswolleninapicalpart,

Pleopodl(Fig.1G);basisrectangularwithl3couplinghooksjbothramibroadand lanceolate・

Pleopod2(Fig.1H);basisrectangularwithllcouplinghooks;innerramibroadand

21

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NoboruNunomura

lanceolatewithshortandnarrowstylus;exopodalsobroad‑lanceolate・

Uropod(Fig.2J)basislong;endopodbroadlanceolatewithaseriesofmarginalspines亘 exopodnarrow、

Re" 7ヵs:ThepresentnewspeciesismostcloselyalliedtoA電pzノg犯かOsaCarscollected fromNorthemAtlanticOcean,buttheformerlsseparablefromthelatterinthefollowing features:(1)widerpleonites,(2)roundedtipofpleotelson,(3)biggerandcontlguouseacheye (4)lessremarkableepimeraofallthepereonites,(5)shorterantennule,(6)longerantenna,and (7)straightstylusontheendopodofmale2ndpleopod.

References

Brusca,R,C、,1984.AmonographontheisopodfamilyAegidaeinthetropicaleastem Pacific1.ThegenusA増n.AllanHancockFd、Monogr、Mar,Bio1.12,1‑39.

Kussakin,0.G. 1979.MarineandbrackishwaterlsopodaofthecoldandtempeI−atewaters oftheNorthemHemisphere,SuborderFlabellifera・OpredelitilipoFauneSSSR 122:1‑470(inRussian)

Richardson,H,,1905.AmonographontheisopodsofNorthAmericaBull.U・SNat.Mus,

54号1‑727.

Richardson,H,1909.IsopodscollectedintheNorthwestPaciflcbytheU.S,BureauofFisheries Steamer《《AlbaTross in1906.

Sars,M,1859.Oversigtoverdeidennorsk‑arctiskeregionforekommendeKrebsdyr、For‐

hand1.Vidensk・selsk,for1958.,1859,;122‑163.

SchioedteJ.C、etMeinert.F、1879.SymbolaeadmonographiamcymothoarumCrustceorum lsopodumFamiliel・Aegidae‑NaturhistTiddskr、Kj6benhaven,ser・ 879,v、12.

321‑379.

Thielema1,,M. 1910.BeitragezurKenntnisderisopodenfaunaOstasiens,Abhndl・Wiss..

supp1.3:1‑109.

参照

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