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Dc"o〃MJ/aBody(FiglA)20timesaslongasgreatestwidth,lateralmarglnsub‑parallel,widestat p e r e o n i t e s 6 ・ E v e s m o d e r a t e l y l a r g e , e a c h w i t h l 5 ‑ l 6 o m m a t i d e a 、 C o l o r y e l l o w , a n d a l l t h e p e r e o n a l s o

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富山市科学博物館研究報告第34号,pp67‑71;(2011:

ANewSpeciesoftheTerrem・iaIIS0podGenus卯,"e""ひ(CruStaa:Ipoda:ArmadiⅡidae)

fi・OmKiiPenmmla,Japan

NoboruNunomura ToVamaScienceMuseum

l‑8‑31,Nishinakano‑machi,Toyama‑shi,939‑8084Japan

紀伊半島から発見されたコシビロダンゴムシ眉(甲殻亜門:等脚目:コシビロダンゴムシ科)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l‑8‑説

山本未基氏が紀伊半島中部の和歌山県南部町の海岸から発見したコシビロダンゴム シ科の1種を、新種助ルe""oisルj /(和名:イシダコシビロダンゴムシ、新称)とし

て記載した。本種はトウキョウコシビロダンゴムシ助ルe""oo6sc"'WS(Budde‑Lund、

1885)と最も類似するが、背面に非常に鮮やかな色彩のパターンを持つこと、オスの 第1腹肢内肢先端付近に16‑17本とより多くの小疎を持つこと、およびその外肢に凹 みがないことなどにより区別される。

キーワード:等脚目、コシビロダンゴムシ科、新種、イシダコシビロダンゴムシ、日本 Keywords:Isopoda,Armadillidae,newspecies,卵ルe""C/Sh/j,Japan

Thegenus球)ルe""oischaracterizedbydeepschismaonventralsidesofepimeraofpereonalsomitel,pereonal te2withanobliquetooth‑likelobeonltsventralside,廿ontallaminaofcephalononlyslightlyprotmdingover somlteZwlthanobllquetooth‑llkelobeonltsventralslde,廿ontallaminaofcephalononlyslightlyprotrudingover vertex,pseudotracheaeonpleopodswithasingleopenmg,andour‑grass‑shapedpleotelson,Hitherto,84speciesfi・om allovertheworld(Schmalfnss,2003)andl5speciesofthegenus助力e""ohavebeenrecordedinJapan(Iwamoto・

'943,Nunomura,1990,1991,1992,2003a,2003b,2007,2009).

Recently,Mr,MikilshidahadhappenedtocollectedterrestnalisopodshavingveryclearcolorDattemondorsal surfaceofdorsalsurfacesatmaritimeareaofNishi‑iwashiro,Minabe‑cho,WakavamaPrefecmre,westpartofKiiPen‑

insula,ThesespeclmensweresubmittedtotheauthorfbridentiflcationbvthecourtesvofDr・MarkJGrygierofthe LakeBiwaMuseum・Astheresultofmyexamination,itprovedtorepresentanewspeciesofthegenusSbルe〃"o、

ThetypematerialisdepositedinLakeBiwaMuseum(LBM),NationalMuseumofNatureandScience,Tokvo (NSMT),ToyamaScienceMuseum,Toyama(TOYA)KitakyushuMuseumofNaturalHistoryandHumanHistoryand

Kitakvushu(KMNH)andOsakaMuseumofNaturalHistory,Osaka(OMNH).

Itisvewdi筋culttomeasurethebodylength,becausetheseanimalsbecomecurledupinaballandbreakseasilvさ therefbre,Irefiained廿ommeasuringthebodylength,exceptofholotype,largeStandsmallestindividualsofbothsexes

TaxonomV 助〃e'j"ois〃 in・Sp.

(NewJapanesename:IShida‑koshibiro‑dangomushi)

(Figs」‐2)

*Conmbutions廿omtheToyamaScienceMuseum,No.40芝

67

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N()b()ruNunomllr皇

M n r e " j α / e x a 加 加H o l o t y p e : m a l e ( B L 5 . 6 m m ) , L B M l 4 3 0 0 0 4 9 3 6 , N i s h i ‑ i w a s h i r o , M i n a b e ‑ c h o , W a k a y a m a P r e ‐ f e c t u r e , e a s t e m p a r t o f K i i P e n i n s u l a l , M a r 2 0 1 0 , c o l l M i k i l s h i d a A l l o t y p e : f e m a l e ( B L 6 . 6 m m ) , s a m e d a t a a s h o l o t y p e 、 P a r a t y p e s : 9 m a l e s , ( B L 3 8 − 6 0 m m ) 1 4 企 m a l e s ( u p t o 6 , 5 m m ) , s a m e d a t a a s h o l o t y p e ; 5 m a l e s ( 3 5 ‑ 6 0 m m ) ,

l2females(49〜76mminbodylength),samelocality,lOJanuary2010,couMikilshida

T y p e s e r i e s i s d e p o s i t e d a s f b l l o w s : h o l o t y p e ( L B M l 4 3 0 0 0 4 9 3 6 ) , a l l o t y p e ( L B M l 4 3 0 0 0 4 9 3 7 ) a n d 2 0 p a r a t y p e s ( L B M l 4 3 0 0 0 4 9 3 8 〜 1 4 3 0 0 0 4 9 4 3 ) a t L a k e B i w a M u s e u m a n d , 5 p a r a t y p e s ( T O Y A C r ‐ 2 3 2 7 4 〜 2 3 2 7 8 ) a t T o y a m a S c i ‐ e n c e M u s e u m , 5 p a r a t y p e s ( N S M T C r ‑ 2 1 2 5 6 ) a t t h e N a t i o n a l M u s e u m o f N a m r e a n d S c i e n c e T o k y o , 5 p a r a t y p e s ( O M N H A r ‐ 8 3 7 3 ) a t t h e O s a k a M u s e u m o f N a m r a l H i s t o r y , a n d 5 p a r a t y p e s ( K M N H I V R ‑ 5 0 0 , 4 9 8 〜 5 0 0 , 5 0 2 ) a t t h e

KitakvushuMuseumofNaturalHistoryandHistory.

Dc"o〃MJ/aBody(FiglA)20timesaslongasgreatestwidth,lateralmarglnsub‑parallel,widestat p e r e o n i t e s 6 ・ E v e s m o d e r a t e l y l a r g e , e a c h w i t h l 5 ‑ l 6 o m m a t i d e a 、 C o l o r y e l l o w , a n d a l l t h e p e r e o n a l s o m l t e s w i t h 6 r o w s o f b l a c k m a r k m g s ・ B a s i s t o c a r p u s o f e a c h p e r e o p o d w i t h m e d i a l p a r t d a r k l y c o l o r e d ・ M a l e s l i g h t l y d a r k e r t h a n 企 m a l e ; c o x a l p l a t e l ( F i g l C ) w i t h a p a i r o f d e e p s c h i s m a o n t h e h i n d ‑ l a t e r a l c o m e r ; c o x a l p l a t e s 2 w i t h a s m a l l l o b e ・

Pleotelson(Fig.2K)hour‑grass‑shaped・

A n t g m u l e ( F i g l D ) 3 − s e g m e n t e d , t e r m i n a l s e g m e n t s l e n d e r , w i t h 5 ‑ 6 a e s t h e t a s c s o n l a t e r a l m a r g m n e a r t i p A n ‐ t e n n a ( F i g l E ) r e a c h i n g p o s t e r l o r m a r g i n o f p e r e o n i t e s l w h e n e x t e n d e d p o s t e r i o r l y ・ F l a g e l l u m 2 ‑ s e g m e n t e d a n d O 8

tlmesaslongasflfhpeduncularsegment,tenninalHagellarsegment3・Otimeslongerthanbasalone・

R i g h t m a n d i b l e ( F i g l F ) w i t h i n c i s o r p r o c e s s b e a r i n g 3 c u s p s ; l a c i n i a m o b i l i s w i t h 3 c u s p s ; m o l a r p r o c e s s r e d u c e d t o p l u m o s e s e t a L e f i m a n d i b l e ( F i g l G ) w i t h i n c i s o r p r o c e s s b e a r i n g 3 c u s p s ; l a c i n i a m o b i l i s w i t h 2 c u s p s ; m o l a r p r o c e s s r e p r e s e n t e d a p l u m o s e s e t a ・ M a x i l l u l a ( F i g l H ) w i t h m e s i a l e n d i t e b e a r i n g 2 p l u m o s e s e t a e o n r o u n d e d a p i c a l m a r g i n ; l a t e r a l e n d i t e w i t h l O s i m p l e s e t a e M a x i l l a ( F i g . 1 1 ) a p i c a l l y b i l o b e d ラ i n n e r l o b e w i t h r e l a t i v e l y n a r r o w f e l d o f s e n s i l l a ・ M a x i l l i p e d ( F i g l J ) w i t h e n d i t e r e c t a n g u l a r , b e a r i n g 4 s p u r s o n d i s t a l m a r g l n ; p a l p a l s e g m e n t l r e c t a n g u l a r ,

distalsegmentswith2setaeonlnnermarginandagroupofsetaeatapex,

P e r e o p o d l ( F i g l K ) w i t h b a s i s 3 5 t i m e s a s l o n g a s w i d e , b e a r i n g 7 ‑ l O s e t a e o n l n n e r a n d o u t e r m a r g i n s う i s c h i u m O , 6 t i m e s a s l o n g a s b a s i s , w i t h 6 − 7 s e t a e o n l n n e r m a r g i n a n d l s e t a o n o u t e r d i s t a l a n g l e ; m e r u s 0 . 6 t i m e s a s l o n g

asischium,withl3‑l4setaeonlnnermarginand3setaeonouterdistalangle;carpus1.6timesaslongaswide,with

m a n y s e t a e o n l n n e r m a r g i n a n d l a t e r a l s u r f a c e , a n d 4 − 5 s e t a e o n o u t e r m a r g m ; p r o p o d u s a s l o n g a s c a l p u s , w i t h a b o u t

lOshortersetaeonbasalhalfand41ongersetaeondistalhalfofinnermargln・

Pereopod2(F唱lL)withbasis3.5timesaslongaswide,bearing3‑4setaeonlnnermarglnand6‑7setaeon

outermarginラischiumaboutO、4timesaslongasbasis;merusaslongasischium,with8setaeonlnnermarginand lsetaatouterdistalangle;calpus1.3timeslongerthanmerus,withmorethan20relativelylongsetaeonlnnermar‐

g i n a n d m a n y s h o r t s e t a e o n l a t e r a l S u r f a c e ; p r o p o d u s O 、 9 t i m e s a s l o n g a s c a r p u s , w i t h 7 ‑ 9 s e t a e o n 1 n n e r m a r g i n a n d

ll‑l2setaeonoutermargm、

P e r e o p o d 3 ( F i g l M ) w i t h b a s i s 3 3 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 b o u t O 4 t i m e s a s l o n g a s b a s i s , w i t h 2 r e l a ‐ t i v e l y s h o r t s e t a e o n m n e r m a r g i n a n d l s e t a a t o u t e r d i s t a l a n g l e う m e r u s a l i t t l e s h o r t e r t h a n i s c h i u m , w i t h 6 ‑ 7 r l s l a ‑ t i v e l v s h o r t s e t a e o n l n n e r m a r g i n a n d l s e t a a t o u t e r d i s t a l a n g l e ; c a r p u s a l i t t l e s h o r t e r t h a n m e r u s , w i t h 9 ‑ l O s e t a e

onlnnermargln;propodusaslongascarpus,with4‑5setaeonmnermargln・

Pereopod4(FiglN)withbasis3.Otimesaslongaswide,bearing7‑8setaeonlnnermarglnandllsetaeon

outermargin;ischiumO,4timesaslongasbasis,with3−4setaeonlnnermarginandlsetaonstemalma屯1,ラmerus 0.7timeaslongasischium,with7setaeon1nnermarginand2‑3setaeonstemalmargln;carpus1.5timelongerthan merus,withl2setaeonlnnermarginincludingllongerbifUrcatedsetaonlnnermarginand4−5shortsetaeonouter margln;propodusslightlylongerthancarpus,with7‑8setaeonbothmarglns・

Pereopod5(FiglO)withbasis38timeslongerthanwide,with8‑lOsetaeonmnermargin;ischiumhalflength ofbasis,with5‑6setaeon1nnermarginand2setaeonoutermargln;merus0.7timesaslongaswide,with5−6setae onmnermarginand2setaeonoutermargln;camus1.7timeslongerthanmerus,with7−8setaeonmnermarginand 4−5setaeonoutermargmラpropodusslightlyshorterthancamus,with9‑llsetaeonbothmarglns.

(3)

ANewSpeciesof帥フルe"//0

P e r e o p o d 6 ( F i g l P ) w i t h b a s i s , 3 7 t i m e s a s l o n g a s w i d e , b e a r i n g 9 ‑ l O s e t a e o n l n n e r m a r g i n う i s c h i u m O 4 号 l o n g a s b a s i s , w i t h 2 ‑ 3 s e t a e o n d o r o s o ‑ l a t e r a l m a r g 1 n う m e r u s 0 . 8 t i m e s a s l o n g a s i s c h i u m , w i t h 4 − 5 s e t a e o n m a r g m ウ c a m u s 1 . 3 t i m e s l o n g e r t h a n m e r u s , w i t h r e l a t i v e l y l a r g e 7 ‑ 8 s e t a e a n d s e v e r a l r e l a t i v e l y s m a Ⅱ e r s e t a e o n

mneS lnner

lnner

Fig.1助ルe""0な〃 in.sp、

Holotype,male,LBM1430004936.A,habims,dorsalview,B,cephalon,fi・ontalview;C,pereonitesl‑3,ventralview量 り,rightantennule,caudalview;E,rightantenna,caudalview;F,rightmandible,caudalview;G,leftmandible,caudaI view;H,leftmaxillula,caudalview;I,le仕maxilla,caudalview;J,leftmaxiIliped,caudalview;K,rightpereopodl‑? 廿ontal,L−Q,leftpereopods2‑7,廿ontalview(All:holotypemale).

6

(4)

NoboruNunomur塵

m a r g l n ; p r o p o d u s a l m o s t a s l o n g a s c a r p u s , w i t h 7 − 8 s e t a e o n m n e r m a r g l n s a n d o n o u t e r m a r g l n

P e r e o p o d 7 ( F i g l Q ) w i t h b a s i s 3 1 t i m e s l o n g e r t h a n w i d e , b e a r i n g 7 ‑ 8 s e t a e o n b o t h m a r g i n s ; i s c h i u m a b o u t Q 6 t l m e s a s l o n g a s b a s i s , w i t h 2 ‑ 3 s e t a e o n o u t e r s t e m a l m a r g l 、 ; m e r u s 0 . 6 t i m e s a s l o n g a s i s c h i u m , w i t h 3 r e l a t i v e l v s t r o n g s e t a e o n m n e r m a r g m ; c a r p u s 1 . 5 t i m e s l o n g e r t h a n m e r u s , w i t h 3 r e l a t i v e l y s t r o n g a n d s e v e r a l w e a k s e t a e l n c l u d i n g 2 t r i f U r c a t e d o n e o n l n n e r m a r g l n , a n d 3 ‑ 4 s i m p l e s e t a e o n d i s t a l l n a r g 1 , ; p r o p o d u s 1 . 2 t i m e s l o n g e r t h a n

carpus,with8setaeon1nnermargln,

Penes(Fig2A)filsifbrm,3.6timeslongerthanwide

P l e o p o d l ( F i g 2 A ) w i t h e n d o p o d s t r a i g h t , a p i c a l a r e a o n l y s l i g h t l y r e c u r v e d o u t w a r d , b e a r i n g l 6 ‑ l 7 d e n t i c l e s d i s t a l l y ; e x o p o d r e c t a n g u l a r , 0 . 5 t i m e s a s l o n g a s w i d e a n d i t s o u t e r m a r g l n o n l y s h a l l o w l y c o n c a v e d ,

P l e o p o d 2 ( F i g . 2 C ) w i t h e n d o p o d s l e n d e r , t a p e r m g t o t l p e x c e e d s 1 3 % o f e x o p a l l e n g t h ; e x o p o d t r i a n g u l a r , w i t h

slnuateoutermargm、

P l e o p o d 3 w i t h e n d o p o d ( F i g 2 E ) t r i a n g l a r , w i t h 4 s e t a e ; e x o p o d ( F i g . 2 F ) t r a p e z o i d a L P l e o p o d 4 w i t h e n d o p o d r e c t a n g u l a r ; e x o p o d ( F i g 2 G ) t r a p e z o i d a l , b e a r i n g 8 s e t a e ・

P l e o p o d 5 w i t h e n d o p o d ( F i g . 2 H ) p e n t a g o n a l ; e x o p o d ( F i g 2 1 ) r e c t a n g u l a r , w i t h 5 − 7 s e t a e o n o u t e r m a r g 1 n a n p

is

with

and

atransverserowofpectinatedscalesandalongrowoffinesetaeondistalpaltnearoutermargm、

U r o p o d ( F i g 2 J ) w i t h e n d o p o d r e c t a n g u l a r ラ e x o p o d s m a l l , w i t h 2 ‑ 3 s e t a e a t t l p

F e 脚 α / e ・ G e n e r a l l y s i m i l a r t o m a l e e x c e p t f b r t r a p e z o i d a l e n d o p o d s o f p l e o p o d s l a n d 2 ( F i g 2 B , D ) E 〃 脚 o / o 邸 ノ . T h e s p e c i e s n a m e i s d e d i c a t e d t o M r ・ M i k i l s h i d a , t h e c o l l e c t o r t h e s p e c l m e n s .

with

が /

一一

鍬/6

フ ー / 、

︑〜ノ

│ 滝

、 ‐ 、

T T − 1

:!

' 1

0.5mm

A一J

Fig.2町'he""0応〃 4,.Sp.

A,Penesandpleopodlinmale,caudalview;B,pleopodlinfemale,caudalview;C,pleopod2inmala

2infemale,caudalviewぅEendopodofleftpleopod3,caudalview;F,exopodofthesame,caudalview言

o f l e f t p l e o p o d 4 , c a u d a l v i e w ; H , e n d o p o d o f p l e o p o d 5 , c a u d a l v i e w ; I , e x o p o d o f t h e s a m e , c a u d a l v i e w

K,Pleotelsonanduropod,dorsalview.(A,C,E‑K,holotypemale;BandDparatypefemale).

pleopod

,eXOpO患 Uropod

D↓GJ

(5)

ANewSpeciesof助ルe"//0

Re耐肺.Thepresentnewspeciesismostcloselyalliedto助ルe""oobsα""s(Budde‑Lund,1885)inhavingrela‐

tivelyshorthour‑grassshapedpleotelson,deepschismaandrectangularexopodofmaleflrstpleopod、Thepresentnew speciesisdistinguishedfi‑omthelatterlnmoredistinctcolorpattemondorsaltergitethano6"ノ・"s・Thefbnnerhas morethanl6‑l7denticlesofendopodofmale齢stpleopod,whereaslOino6sc"〃/s・Theoutermarginofthepresent newspeclesonlyshallowlyconcaved,butdeeplyino6z"."&

ThepresentnewspeciesisalsoalliedtoS.応α"s(Iwamoto,1943)knownhomwidelydistributedincentral Japaninhavingrelativelyshorthour‑Erassshapedpleotelsonanddeepschisma・Thenewspecieshasclearercolorpat‑ temsondorsalsurfaceofpereonltes,whilealmostblackin応α"s,Exopodofmaleflrstpleopodofthepresentnew speciesisrectangular,whileitistriangularin〔わ}・/心Thepresentnewspecieshasobviouslyshorterteethof maxillula;averagelengthofteethtothewidthis,whereasin伽晒α"『・Thefbrmerhasmorethanl6−l7denticlesof endopodofmalefirstpleopo。,whereas6indb蹄α/心

AcknowledgEments

IwouldliketoexpressmvslncerethankstoMr・MikilshidafbrhiskindnesslncolletingthematerialandDr、 MarkJ,GrygierfbrinvitingmetosmdvthesespeclmensasaparticipantinLakeBiwaMuseumComprehensiveRe searchPrQjectSO6‑02

RefErences

lwamoto,K,1943ⅧSomeTerrestriallsopoda廿omJapanM、DC加な〃Qyo〃Sルok"61噸〃(BorααZoo/o邸)J1(12):

17‑32,Yokendo,Tokvo.(InJapanese.)

Nunomura,N,,1990.StudiesontheterrestrialisopodcrustaceansinJapan,V,Taxonomyofthefamiliesor Annadillidiidae,AnnadillidaeandTvlidaeB""e"〃Q/Zbyα"'αScje"Ce.〃iノsez",',(13):l‑58

Nunomura,N・1991.StudiesontheTerrestriallsopodCrustaceansi、Japan,VI・FurthersupplementstotheTaxonomy.

B"//e"〃Qfrbya,"αScie"Ce、MZI"ノ",(14):1‑26.

Nunomura,N・1992.StudiesontheTelTestriallsopodCrustaceansinJapan,V11.Supplementstothetaxonomv‑3.B"/‐

/e"〃qf7bya胴αSc/e"ceMise"(15):1‑23.

Nunomura,N,2003aTwonewspeciesofthete面estrialisopodsfbrmOkinawa,southernJapanB""e"〃Qf7hyα",α Sc/e"ceM(e""Z(26):5‑12.

Nunomura,N・2003b、FourNewTe面estriallsopodCrustaceans廿omKashimalsletanditsneiboring,TanabeBay.β"ノー

/e"〃7byα",αSc花"CeMiイse"",,(26):25‑45.

Nunomura,N,2007.TelTestrialisopodCrustaceans廿omHachijolsland,middleJapanB""e"〃Qfn"α脚α5℃je"ce M"se"脚(30):17‑36.

Nunomura,N,2009TerrestrialisopodCrustaceans廿omDaitolslands,SouthemJapan.B""e"〃o/Tbya脚aScje"ce MZsez,",,(32):75‑87.

Schmalhlss,H,2003WorldCatalogoftelTestrialisopod(Isopods:Oniscidea).S/""gα"rerBej"agez"7M7""k""dセ.

Seノ..A654:1−341.

71

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