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A new species of the terrestrial isopod genus Spherillo (Crustacea: Isopoda: Armadillidae) from Kii Peninsula, Japan

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A new species of the terrestrial isopod genus Spherillo (Crustacea: Isopoda: Armadillidae) from Kii Peninsula, Japan

journal or

publication title

Bulletin of the Toyama Science Museum

number 34

page range 67‑71

year 2011‑03‑15

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

itory̲uri&item̲id=941

(2)

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 ‑ 3 1 , N i s h i n a k a n o ‑ m a c h i , T o y a m a ‑ s h i , 9 3 9 ‑ 8 0 8 4 J a p a n

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)

( F i g s 」 ‐ 2 )

*Conmbutions廿omtheToyamaScienceMuseum,No.40芝

67

(3)

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 ・

P l e o t e l s o n ( F i g . 2 K ) h o u r ‑ g r a s s ‑ s h a p e d ・

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 t l m e s a s l o n g a s f l f h p e d u n c u l a r s e g m e n t , t e n n i n a l H a g e l l a r s e g m e n t 3 ・ O t i m e s l o n g e r t h a n b a s a l o n e ・

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 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 l p 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 m o r e t h a n 2 0 r e l a t i v e l y l o n g s e t a e o n l n n e r m a r ‐ 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 m a r g l n ; p r o p o d u s s l i g h t l y l o n g e r t h a n c a r p u s , w i t h 7 ‑ 8 s e t a e o n b o t h m a r g l n s ・

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

戸り

(4)

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、

H o l o t y p e , m a l e , L B M 1 4 3 0 0 0 4 9 3 6 . A , h a b i m s , d o r s a l v i e w , B , c e p h a l o n , f i ・ o n t a l v i e w ; C , p e r e o n i t e s l ‑ 3 , v e n t r a l v i e w 量 り,rightantennule,caudalview;E,rightantenna,caudalview;F,rightmandible,caudalview;G,leftmandible,caudaI v i e w ; H , l e f t m a x i l l u l a , c a u d a l v i e w ; I , l e 仕 m a x i l l a , c a u d a l v i e w ; J , l e f t m a x i I l i p e d , c a u d a l v i e w ; K , r i g h t p e r e o p o d l ‑ ? 廿ontal,L−Q,leftpereopods2‑7,廿ontalview(All:holotypemale).

6 管

(5)

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

。 i s ‐

with

and

a t r a n s v e r s e r o w o f p e c t i n a t e d s c a l e s a n d a l o n g r o w o f f i n e s e t a e o n d i s t a l p a l t n e a r o u t e r m a r g m 、 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 .

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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).

p l e o p o d

,eXOpO患 U r o p o d .

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(6)

ANewSpeciesof助ルe"//0

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

t i v e l y s h o r t h o u r ‑ g r a s s s h a p e d p l e o t e l s o n , d e e p s c h i s m a a n d r e c t a n g u l a r e x o p o d o f m a l e f l r s t p l e o p o d 、 T h e p r e s e n t n e w s p e c i e s i s d i s t i n g u i s h e d f i ‑ o m t h e l a t t e r l n m o r e d i s t i n c t c o l o r p a t t e m o n d o r s a l t e r g i t e t h a n o 6" ノ ・ " s ・ T h e f b n n e r h a s morethanl6‑l7denticlesofendopodofmale齢stpleopod,whereaslOino6sc"〃/s・Theoutermarginofthepresent newspeclesonlyshallowlyconcaved,butdeeplyino6z"."&

ThepresentnewspeciesisalsoalliedtoS.応α"s(Iwamoto,1943)knownhomwidelydistributedincentral J a p a n i n h a v i n g r e l a t i v e l y s h o r t h o u r ‑ E r a s s s h a p e d p l e o t e l s o n a n d d e e p s c h i s m a ・ T h e n e w s p e c i e s h a s c l e a r e r c o l o r p a t ‑ 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 A n n a d i l l i d i i d a e , A n n a d i l l i d a e a n d T v l i d a e B " " e " 〃 Q / Z b y α " ' α S c j e " C e . 〃 i ノ s e z " , ' , ( 1 3 ) : l ‑ 5 8

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

B " / / e " 〃 Q f r b y a , " α S c i e " C e 、 M Z I" ノ " , ( 1 4 ) : 1 ‑ 2 6 .

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