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A new species of the genus Cyathura (Crustacea: Isopoda) from the Lake Shinji-ko, Shimabe Prefecture, western Japan

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A new species of the genus Cyathura

(Crustacea: Isopoda) from the Lake Shinji‑ko, Shimabe Prefecture, western Japan

journal or

publication title

Bulletin of the Toyama Science Museum

number 24

page range 19‑23

year 2001‑03‑25

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

itory̲uri&item̲id=764

(2)

富山市科学文化センター研究報告第24号,pp・ 9‑23;(2001;

ANewSpeciesoftheGen Q'α鋤 a(Crusta a:Isopoda)

fh・omtheLakeShinji‑ko,ShimanePrefEcture,westemJapan*

NoboruNUNOMURA ToyamaScienceMuseum

l‑8‑31,Nishinakano‑mashi,Toyama‑shi,939‑8084JAPAN 宍道湖産スナウミナナフシ属(甲殻類,等脚目)の−新種零

布 村 昇 富山市科学文化センター

〒939‑8084富山市西中野町1−8−31

島根県宍道湖で発見されたウミナナフシを新種,シンジコスナウミナナフシqノαr"γa sh 伽e" N皿omuraとして記載した。本新種は福岡県多多良川河口などから知られているキ

クチスナウミナナフシqノαrル"rα〃""c〃〃Nunomura,1977と,第2触角内肢の先端付近で二股 に分岐している点でもっとも類似するが,(1)目を持つこと,(2)第1小顎先端の歯の数が少な いこと,(3)大顎髪の剛毛数が多いこと,(4)顎脚第2節の長い剛毛を欠くこと,(5)各胸節,特 に底節や座節に剛毛の数が多いこと等で区別される。本種は熊本県緑川から知られているヒゴ スナウミナナフシqノ師加rα〃goe"sなNmomura,1977,ならびに福岡県室見川から知られてい るQ′αrル"γα耐"γo碗je"sjs,Nunomural976とも類似している。模式標本は富山市科学文化センター で保管され,副模式標本は富山市科学文化センター,大阪市立自然史博物館ならびにホシザキ グリーン財団で保管される。

キーワードー:シンジコスナウミナナフシ,ウミナナフシ亜目,スナウミナナフシ科,宍道湖,

等脚目,新種,分類

SeveralanthuridspeclmenswerecollectedfTomtheLakeShmjiko,Shimane,JapanSeaside ofwestemJapanandhandedovertomefbridentification、Attheresultofmvsmdy,theyrepre‑

sentedanewspeciesofthegenusQノαrル"raThepresentnewspeciesismostcloselvalliedto qノarh"rak c肋Nunomura,1977,butthefbnnerlsseparatedfTomthelatterinthefbllowing f e a m r e s : ( 1 ) p r e s e n c e o f e y e s , ( 2 ) l e s s n u m e r o u s t e e t h o n t h e a p i c a l b o r d e r o f m a x i l l u l a , ( 3 ) m o r e setaeonmaxillipedalpalp,(4)absenceoflongersetaeonmaxillipedand(5)morenumerous setaeonpereopods,especiallyonbasisandischium,Thepresentnewspeciesisalsoalliedto qノαZ"γαノ'jgoe"sjsNunomura,l977andQノαr加rα〃"イro e" Nunomrua,1976,bothreported けomnversofKyusu,westemJapan

HolotypeandseveralparatypasaredepositedattheToyamaScienceMuseum,otherparatypes aredepositedattheOsakaMuseumofNamralHistoryandHoshizakilnstimtefbrWildlife

Protectlon、

Keywords:Qノαr"『α,Qノ"h"rasル放Ce"sjs,Anthuridae,LakeShinji‑ko,Anthuridae,Isopoda,

newspecles,taxonomy.

TheanthuirdeangenusQ'虹加rahasbeenfbund丘omnotonlymarlneenvlronmentsbutalsoinlandwatersofvari‐

*ContributionoftheToyamaScienceMaseumNo、247

19

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NoboruNUNOMURA

ouspartsJapan・FromthebrackishwaterofLakeShi可iko,hithertomanyspeclmenshavebeencollectedbuttheyhave beenallfemaleandnomalehasbeencollectedButinFebruarv2000,Mr・Ke可iToda,ShimaneEnvironment&

HealthPublicCoIporatlon,whosucceedtocatchsomemaleindividuals師mvariousareasofShinjiko,Shimane Prefecmre,andtheywereplacedatmydisposal,Astheresultsofthesmdyofmine,1trepresentsanewspeclesof thegeunsqarh α、

Q'α鋤 asル 批 加脇sp.、0V.

[Japanesename:Shi可iko‑suna‑uminanahlshi,new]

( F i g s 、 1 ‑ 2 )

Description:A ノe,Body11.5timesaslongaswide・Colorwhitewithi面egularpattems・Evesmediocrebutnof discemedTelsonwithapairofstatosvstsinthebasalhalfAntennule(FiglC):5−segmented,Antenna(FiglE):5‐

segmentedMandible(Fig.1F):parsincisival7〜20‑toothed;palp3‑segmentedラtenninalsegmentwithl7〜20setaa Maxillula(Fig.1G):longwithastrongtoothatthetipand4teethnearinnerdistalareaMaxilliped(Fig.1H):3 segmented:sSegmentlrectangular;segment2rectangularwithmanysetae;tenninalsegmentsemicircular,withmany s e t a e a r o u n d m a r g i n ・ P e r e o p o d 、 1 ( F i g 2 A ) : b a s i s s t o u t , L 4 t i m e s a s l o n g a s w i d e ; i s c h i u m a l i t t l e l o n g e r t h a n b a s i s 、 withmanyfinesetaeoninnermargm;merus1.5timeswiderthanlong,withmanysetaeonmnermargin;carPusl/3 aslongasmerus,withmanysetaeonmnermargm;camusshortandtriangularwith27〜30setaeonlnnermargm;

propodusstoutwithapromberanceonthebasalhalfonlnnermargin;dactylusreachesthedistalendofcalPus,

Pereopod2(Fig2B):basisrectangular29timesaslongaswide,with7〜lOshortsetaeonmnermarginandabout 70relativelylongsetaeonoutermartin;ischiumalittleshorterthanbasis,withl2〜l51ongerandseveralshortersetae onlnnermargln;merus3/5aslongasischium,withl4〜l7setaeoninnermarginand8〜l0setaeatouterdistalarea:

camusmangularwithl6〜25shortsetaearoundthemargm;propodus4〜7setaeonmnermargmandl3setaeon outermarginPereopod3.(Fig.2C):basisrectangular,2.5timesaslongaswide,withabout40setaeonlnnermargm andseveralsetaeonbasalhalfofoutermargin;ischium4/5aslongasbasis,with20〜25setaeoninnermargmand 4〜5setaeonoutermargln;merus3/4aslongasischium,withabout301ongsetaeoninnermarginand6〜81ong setaeonouterdistalarea;carpusshort,with6〜7stoutersetaeandseveralfinersetaeonmnermargin;propodusrec‑

tangular,aslongasmeruswith6〜7setaeonlnnermarginandl2setaeonoutermarginPereopod4(Fig.2,):basiざ withalongsetaatinnerdistalangle,aboutlOsetaeonmnermarginandl7〜21setaeonoutermargin;ischiumwith 8〜lOlongsetaeonmnermarginand7〜8setaeonoutermargin;merusrectangular,withmanylongsetaeoninner marginand3setae;carPussmallandalmostsquarewith61ongsetaeonmnermargm;propodus,with4〜5relatively sholtsetaeoninnermarginandl4〜15setaeonoutermarginPereopod5.(Fig2E):basisrectangular,1.6timesas longaswide,withandll〜12setaeonlnnermarginandalongsetaatinnerdistalangle;ischiumalittleshorterthan basis,withl8〜20setaeoninnermargln,oneofthemislongerthantheothersうcaIpus7/l0aslongasmerus,with 8〜10relativelylongsetaeoninnermarginand2setaeonouterdistalarea;calpus3/5aslongasmerus;propodus with3setaeoninnermargi、andlOsetaeonoutermarginPereopod6(Fig.2F):basis2.6timesaslongaswide,with morethan30setaeonoutermargin;ischium3/5aslongasbasis,with25setaeonlnnermarginand4〜6setaeon outermargin;merusalittleshorterthanischium,withl4〜l61ongsetaeoninnermargin;carpusroundedmangular,

withl5〜l6setaearoundthemargi、;propodus1.4timesaslongasmeruswith3stoutsetaeandl4〜16setaeon

outermarginPereopod7(Fig2G):basis2.5timesaslongaswide,withl7〜l9setaeoninnermarginandl2〜l4

setaeoninnermargin;ischiumaslongasbasis,withl5〜l7setaeoninnermarglnand7〜8setaeonoutermargm亭

memshalfthelengthofischium,withl3〜l5setaeonlnnermarginand8〜10setaeonoutermargm;carpushalfthe

lengthofmems,with4〜5setaeoninnermarginand4〜5setaeonoutermargin;propodusL5timesascalpuswith

31ongerandmanyshortersetaeonmnermarginandlO〜l3setaeonoutermarginPleopodl(Figll)ellipse,with

manysetaearoundmargin,Pleopod2(flglJ):basisendopodwithstyluswhosetipisbi‑filrcated;exopodlanceolate

Pleopods3〜5;bothramielongatedandwithsinuatemarginUropod(FiglK‑L):endopodellipse;exopodellipsewith

(4)

ANewSpeciesoftheGenusqノ"伽rα廿omShinji‑ko

Fig.1.qノ ルz"・asル j"e"sおsp.、ov.

A:Dorsalview;B:Antennuleoffbmale.C:Antennuleofmale.D:Antennaoffemale E:Antennaofmale.F:Mandible.G:Maxillula.H:Maxilliped・I:Pleopodl.』:Pleopod 2inmale.K:EndopodofuropodL:ExopodofuropodM:Pleotelson(A,C,E−M胃 Holotypemale,BandDAllotypefemale).

21

(5)

NobomNUNOMURA

Fig2.Q′"〃z"asル 放Ce"sIsspnov・

A − G : P e r e o p o d s l ‑ 7 ( A l l : H o l o t y P e m a l e ) :

s e t a e a r o u n d t h e m a r g i n , P l e o t e l s o n ( F i g l M ) l a n c e o l a t e , w i t h a p a i r o f s t a t o s y s t s ・

Femaleisalmostsameexceptthecopulatoryorganandlessnumeroussetaeonbothantennae(Fig.1BandD) E"腕oノo野:TheShi可ikoisthenamethelake,typelocalitv・

Mzだ"αノexa加加ed3J3(13,holotype19.8mminbodylengthand2ケケparatypes15.3〜15.5mminbodv lengthand5早早(1早allotype,l39mminbodylengthand4早早,paratypeslO、9〜l28mminlength)offKimachi Shi可iko,ShimanePrefFeb,29,000,colLKe可iToda,23(19.0〜192mm)inbodylength4早早(111〜l54mmln bodylength),offKimachi,Shi可iko,ShimanePerf,Nov、30,1999colLKenjiToda,7早早(lLO〜l6Jmminbody l e n g t h ) T o r i g a s a k i , S h i n j i k o , A p r , 1 2 , 2 0 0 0 , c o l L K e 可 i T o d a

7〕フeHolotype(TOYACr‑12855),allotype(TOYACr‑l2856)andl5paratypes(TOYACr‑l2857〜12871)are depositedattheToyamaScienceMuseum,9paratyes(OMNHAr‑4679〜4687)atOsakaMuseumofNaturalHistorv andtheMuseumofShimaneEnvironmentallnstimteand5paratypes(HOWP‑BOOOl〜0005)attheHoshizakilnstimte

fbrWildlifeProtection・

Re碗αノ化3..ThepresentnewspeciesismostcloselvalliedtoQノ 方z".α〃k"c〃〃Nunomura,1976,butthefbnnerls

s e p a r a t e d f i f o m t h e l a t t e r i n t h e f b l l o w i n g f e a m r e s : ( 1 ) p r e s e n c e o f e y e s , ( 2 ) l e s s n u m e r o u s t e e t h o n t h e a p i c a l b o r d e r

ofmaxillula,(3)moresetaeonmaxillipedalpalp,(4)absenceoflongsetaonmaxilliped(5)morenumeroussetae

onpereopods,especiallyonbasisandischiumThepresentnewspeciesisalsoalliedtoqノαrル α方垣Ce" Nunomura

l977,reportedfTomthemouthofMidoriRiver,westemKyushu,especiallvinhavingsimilarstructureofmalesecond

p l e o p o d B u t t h e f b n n e r l s s e p a r a t e d 廿 o m t h e l a t t e r i n t h e f b l l o w i n g f b a t u r e s : ( 1 ) s t r o n g e r p r o c e s s e s o n a n t e r l o r m a r g l n

o f c e p h a l o n , ( 2 ) 1 e s s n u m e r o u s t e e t h o n t h e a p i c a l r e g i o n o f m a x i l l u l a , ( 3 ) l e s s n u m e r o u s t e e t h o f p a r s i n c i s i v a m a n ‑

dible,(4)lessnumeroussetaeonmandibularpalpa、。(5)lackoflongsetaemaxillipedThepresentnewspeciesis

(6)

ANewSpeciesoftheGenusCyar伽rafromShi可i‑ko

mostcloselyalliedtoCyar"rα〃' o e"sjs,Nunomural974,reported姉mtheMuromiRiver,FukuokaPrefecmre andKyushu,butthefbrmerlsseparatedfTomthelatterbythefbllowingfeamres:(1)morestronglyhlrcatedprocess o n m a l e s e c o n d p l e o p o d , ( 2 ) l e s s n u m e r o u s t e e t h o n a p i c a l a r e a o f m a x i l l u l a , ( 3 ) l e s s n u m e r o u s t e e t h o f p a r s i n c i s i v a ofmandible,(4)absenceoflongsetaeonmaxilliped,(5)lessnumeroussetaeofbothantennae

Acknowledgements

lexpressmyslncerethankstoMr・KerリiToda,ShimaneEnvironment&HealthPublicColporatlon,whocollected thesespecimens廿omShi可ko.

Re庇rences

Bamard,K、H1914.ContributionstothecmstaceanfaunaofSouthA廿ica3・AdditionStothemarineisopoda,with notesonsomepreviouslvincompletelyknownspecies4"〃Sb"/力4/kMiィs、10.325a‑442

MillerRJ,andWDBurbanck,l96LSystematlcsanddistributionofanaesthuarineisopodCrustacean,Qα/ル"ra po/"α,(Stimpson,1855)newcomh,廿omtheGulfandAtlanticseaboardOfUnitedState,BIO/、β"".120(1):

62‑84.

NunomuraN、1974.ANewAnthuridlsopod廿omtheEsmalyoftheMuromiriver,NorthemKyushu,Japan.B"〃O ka

Miィ8.ⅣZJr.〃師.28:13−16.

NunomuraNl977,Marinelsopoda廿omAmakusa,Kyushu(1)P"〃』碗αk"応aMtJr・Bjo/・Lah幻,"s"[ノ"jvelW"

4(2):71‑90.

Nunomura,N200QANewSpeciesoftheGenusQノα/"rαけomtheLakeKasumlgauralbarakiPrefecture,middle JapanB""、7byα腕αS Mイ&23:5−9

22

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