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A new species of the genus Gnorimosphaeroma (Crustacea, Isopoda) from a freshwater stream of Izu Peninsula, middle Japan

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A new species of the genus Gnorimosphaeroma (Crustacea, Isopoda) from a freshwater stream of Izu Peninsula, middle Japan

journal or

publication title

Bulletin of the Toyama Science Museum

number 30

page range 37‑42

year 2007‑02‑25

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

itory̲uri&item̲id=858

(2)

BulletinoftheToyamaScienccMuseum(30),pp37‑42;(2007ミ

ANewSpecieS0ftheGenusG" 0叩加 0" (Cmstacea,I poda)fmm afreshwaterStreamofIzuPeninSula,middleJapan*

NoboruNunomura

ToyamaScienceMuseum

Nishinakano‑machi,Toyama‑shi,939‑8084JAPAN

伊豆半島の淡水域で発見されたイソコツブムシ属の1新種

布 村 昇 富山市科学文化センター

〒939‑8084富山県富山市西中野町1‑8‑31

静岡県伊豆半島南伊豆町伊浜の淡水域から発見されたイソコツブムシ属の1種を新種 G"o"",OSP〃αe『o",aIz"e"se(和名:イズコツブムシ:新称)として記載した。従来,本属 は海産の種を除くと主に日本海側の淡水域をはじめ,一部北海道の太平洋側,九州の東 シナ海側,小笠原諸島から生息が確認されているが,本州太平洋側の淡水からは初めて の出現である。本種はGルoes"α" と最も類似するが,(1)第1胸肢長節後縁の岡'1毛数 が少ないこと,(2)第1触角の鞭節数が少ないこと,(3)第7胸肢腕節後縁の岡'1毛数が 少ないこと,(4)第1胸肢腕節と前節に2叉した岡'1毛を欠くことなどによって区別され

る 。

本種はまた,小笠原諸島母島から知られているG加"加e"seとも類似するが,(1)オ ス第1胸肢長節後縁の剛毛数が少ないこと,(2)第1触角の鞭節数が少ないこと,(3)

腹肢の剛毛が少ないこと,(4)第2胸肢前節の基部ではなく全体に内側が膨らんでいる こと,(5)第7胸肢腕節に多くの岡'1毛を持つことなどの点で区別される。

本種のホロタイフ.は富山市科学文化センター(TOYACr‑13247)で保管される。

KeVwordS:Isopoda,taxonomy,G"o河加oSphαo"1α,Sphaeromatidae,newspecles,

廿eshwater

キーワード:等脚目,分類学,イソコツブムシ属,イズコツブムシ,新種,淡水

Duringasurveyofasmall廿eshwaterstreamoflzuPeninsula,Mr・TakeshiHoriguchi,ECOSYSCo.,Ltd enedtoflndsomespeclmensofisopodcrustaceans・TheywerehandedovertoMr,GyoYoshinari,IDEA happenedtofmdsomespeclmensoflsopodcrustaceans・lheywerehandedovertoMr・uyoYosnlnar1,1u」ゴ,A C o n s u l t a n t s , I n c . , f b r i d e n t 浦 c a t i o n a n d t h e n t h e y w e r e s e n t t o m e f b r i d e n t i f l c a t i o n a g a i n , A s t h e r e s u l t o f t h e c l o s e e x a m i n a t i o n s o f m i n e , t h e y a p p e a r e d t o r e p r e s e n t a n e w s p e c l e s o f t h e g e n u s G " o 阿 加 o S p ル αo m a ・ H i t h e r t o , t w e n t y ‑ t w c s p e c i e s 廿 o m a l l o v e r t h e w o r l d n i n e t e e n s p e a c e o f t h i s g e n u s h a v e b e e n r e c o r d e d m J a p a n , b u t 廿 e s h w a t e r s p e c i e s h a v e b e e n r e c o r d e d m a i n l y 丘 o m t h e a r e a s f a c i n g t h e S e a o f J a p a n ・ I t i s t h e f i r s t r e c o r d f m m f T e s h w a t e r h a b i t a t o f p a c i f I c s i d e o f H o n s h u a n d p a r t l y P a c 面 c s i d e o f H o k k a i d o , E a s t C h i n a s e a s i d e o f K y u s h u a n d B o n i n l s l a n d , T h e h o l o t y p e a n d a p a r t o f p a r a t y p e s w i l l b e d e p o s i t e d a t t h e T o y a m a S c i e n c e M u s e u m 、 S e v e r a l s p e c l m e n s o f t y p e s e r l e s w i l l b e d e p o s i t e d a [

NationalScienceMuseum,TokyoandOsakaMuseumofNamralHistory.

*ContributionsfromtheToyamaScicnccMuseum,No.331

3 ?

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NobonlNunomura

G"@〃碗0邸〕" 0 αJz"g" n.sp.

(Japanesename:Izu‑kotsubumushi,new)

( F i g s l ‑ 2 )

MtJre"αjsα加加e臥・2忽忽(lc同holotype,41mminbodylengthandlJparatypes,40nnninbodylengthand蔭 皐早(1平allotype,38mminbodylengthand5早早paratypes2」‐33mlninbodylength),Ihama,Izu‑cho,Shizuoka P r e f ( 3 4 0 4 2 i 9 Ⅷ N l 3 8 0 4 5 ' 6 ' i E ) a l t 2 1 0 m , c o l l T u v o s h i H o r i g u c h i l , 5 , J a n 2 0 0 6 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 言 Holotype(TOYACr‑l3247),allotype(TOYACr‑l3248)and4paratypes(TOYACr‑13249〜13252)areattheToyam霞 ScienceMuseum,2paratypes(OMNHAr‑7443〜7444)attheOsakaMuseumofNaturalHistorvand2paratypeg ( N S M T C r ‑ I 6 8 6 2 ) a t t h e N a t i o n a l S c i e n c e M u s e u m , T o k y o .

Fig.1G"0" 0叩加 0碗aiz"e" n.sp.

A : D o r s a I v i e w う B : A n t e n n u l e ; C : A n t e n n a ; D : C 1 y p e u s a n d l a b l u n ; E : R i g h t m a n d i b l e ; F : L e f I m a n d i b l e ; G : P a l p o f l e f i m a n d i b l e 皇 H : M a x i l l u l a ; I : M a x i l l a う J : M a x i l l i p e d う K : P e n e s ; L − O : P l e o p o d s l ‑ 4 ; P : E n d o p o d o f p l e o p p o d 5 ; Q : E x o p o d t h e s a m e R : U r o p o 蓬

( A l l : h o l o t y p e m a l e ) .

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D e s c ,j o 〃 Q / 脚 α / e ル o / o 駅 p e : B o d y o v a t e L 6 t i m e s a s l o n g s a s w i d e C o l o r b l a c k i s h b r o w n S u r f a c e s m o o t h , w i t h s m a l l t r a n s l u c e n t r o u n d p a t t e m s , C o x a l p l a t e s d i s t i n c t o n p e r e o n a l s o m i t e s 2 ‑ 7 ・ E y e s m e d i o c r e i n s i z e a n d e a c h e y e c o m p o s e d o f a b o u t 3 6 ‑ 3 7 o m m a t i d i a , L a t e r a l c o m e r s u b ‑ p a r a l l e l ・ E p i s t o m e d e l t o i d a n d l a b r u m e l l p t i c a l , A n t e r l o r s u m r e

l i n e l o n g e r t h a n p o s t e r l o r o n e 、 P o s t e r l o r m a r g i n o f p l e o t e l s o n a l m o s t s t r a i g h t ・

A n t e n n u l e ( F i g l B ) c o m p o s e d o f 3 p e d u n c u l a r s e g m e n t s a n d 8 H a g e l l a r s e g m e n t s A n t e n n a e ( F i g l C ) c o m p o s e d o f 5 p e d u n c u l a r s e g m e n t s a n d l l H a g e l l a r s e g m e n t s R i g h t m a n d i b l e ( F i g l E ) : p a r s i n c i s i v a 3 ‑ t o o t h e d ; l a c i n i a m o b i l i s n o t c h i t i n z e d a n d w e a k l v ‑ 3 h e a d e d う 8 p l u m o s e s e t a e b e h i n d l a c i n i a m o b i l i s ; p r o c e s s u s m o l a r i s w i d e 、 L e f i m a n d i b l e ( F i g l F ) : p a r s i n c i s i v a 3 ‑ t o o t h e d ; l a c i n i a m o b i l i s 3 ‑ t o o t h e d ; 6 p l u m o s e s e t a e b e h i n d l a c i n i a m o b i l i s ; p r o c e s s u s m o l a r i s w i d e ・ M a x i l l u l a ( F i g l H ) : i n n e r l o b e w i t h 4 p l u m o s e s e t a e a t t h e t i p ; o u t e r l o b e w i t h l O s e t a e o n d i s t a l m a r g i n M a x i l l a ( F 唱 l H ) : e n d o p o d w i t h l O ‑ 1 1 p l u m o s e s e t a e う m n e r l o b e o f e x o p o d w i t h l 2 ‑ l 4 s e t a e a n d o u t e r l o b e o f t h e s a m e w i t h l O s e t a e t a e M a x i l l i p e d ( F i g l l ) : e n d i t e w i t h a c o u p l i n g h o o k o n l a t e r a l m a r g l n ; a n d 7 ‑ 8 s t o u t s e t a e o n d i s t a l m a r g l n : p a l p 5 ‐ s e g m e n t e d , s e g m e n t l s h o r t ; s e g m e n t 2 b i g , w i t h a p r o t r u d e d i n n e r d i s t a l a r e a b e a r i n g m o r e t h a n l O ‑ 1 3 s e t a e a t t h e t i p a n d a r e l a t i v e l y l o n g s e t a a t o u t e r d i s t a l a n g l e ; s e g m e n t 3 w i t h m o r e t h a n l O ‑ l 2 s e t a e o n l n n e r d i s t a l a r e a a n d 3 s e t a e a t o u t e r d i s t a l a n g l e ラ s e g m e n t 4 a l i t t l e l o n g e r b u t n a r r o w e r t h a n s e g m e n t 3 , w i t h 8 ‑ 1 0 s e t a e o n l n n e r d i s t a l a r e a a n d 5 − 6 s e t a e o n d i s t a l h a l f o f o u t e r m a r g l n ; s e g m e n t 5 a s l o n g a s , b u t n a r r o w e r t h a n s e g m e n t 4 , w i t h 8 ‑ l O s e t a e a r o u n d t h e m a r g l n 、

P e r e o p o d l ( F i g 2 A ) : b a s i s 2 7 t i m e s a s l o n g a s w i d e a n d s l i g h t l y b r o a d e n i n g t o w a r d t h e t i p , w i t h a r e l a t i v e l y l o n g s e t a a t l n n e r d i s t a l a n g l e ; i s c h i u m 2 / 3 a s l o n g a s b a s i s ; m e m s l e s s t h a n 2 / 3 a s l o n g a s i s c h i u m , w i t h a s e t a o n l n n e r d i s t a l a n g l e , m a n 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 a s e t a a t o u t e r d i s t a l a n g l e う c a m u s t r l a n g u l a r , w i t h m a n y s e t a o n l n n e r m a r g l n ; p r o p o d u s , 1 . 3 t i m e s a s l o n g a s m e n l s , w i t h a s e r i e s o f 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 5 s e t a e o n o u t e r m a r g i n ; d a c t y l u s

bifld

P e r e o p o d 2 ( F i g 2 B ) : b a s i s o b l o n g a n d 4 1 t i m e a s l o n g a s w i d e ラ i s c h i u m 7 5 % a s l o n g a s b a s i s , w i t h m a n y s h o r t s e t a e o n l n n e r m a r g m ぅ 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 2 − 3 s e t a e a n d m a n y 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 2 s e t a e a t o u t e r d i s t a l m a r g l n ; c a m u s a l m o s t a s l o n g a s m e r u s , w i t h 6 − 7 s e t a e o n l n n e r m a l ・ g i n , 2 − 3 s e t a e o n o u t e r m a r g l n a n d 4 s e t a e a t o u t e r d i s t a l a n g l e ぅ p r o p o d u s , a l i t t l e l o n g e r t h a n c a r p u s , w i t h c o n v e x p a r t o n l n n e r m a r g i n b e a r i n g 4 s e r r a t e d

s e t a e ; d a c t y l u s b i 価 。 、

P e r e o p o d 3 ( F i g 2 D ) a l i t t l e l o n g e r t h a n p e r e o p o d 2 : b a s i s r e c t a n g u l a r , 4 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 2 / 3 a s l o n g a s b a s i s , w i t h m a n v s h o r t s e t a e o n l n n e r m a r g l 、 ; m e r u s a l m o s t h a l f l e n g t h o f i s c h i u m , w i t h a l o n g s e t a a t m n e r d i s t a l a n g l e , m a n 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 2 s e t a e a t o u t e r d i s t a l a r e a う c a r p u s a l i t t l e l o n g e r t h a n m e r u s , w i t h 4 s e t a e o n d i s t a l h a l f o f i 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 b a s a l h a l f o f i l m e r m a r g m ; 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 c a l p u s , w i t h

manvshortsetaeonmnermarginラdactylusbifid、

P e r e o D o d 4 ( F i g 2 E ) : b a s i s 3 . 7 t i m e s a s l o n g a s w i d e , w i t h a s e t a a t l n n e r d i s t a l a n g l e a n d 7 ‑ 8 s h o r t s e t a e o n l n n e r m a r g i n ; i s c h i u m 4 / S a s l o n g a s b a s i s , w i t h a s e t a a t l n n e r d i s t a l a n g l e ラ m e r u s 5 5 % a s l o n g a s i s c h i u m , w i t h a s e t a a t l n n e r d i s t a l a n g l e , m a n y 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 2 s e t a e a t d i s t a l m a r g m ぅ c a l p u s , a l i t t l e s h o r t e r a n d n a r r o w e r t h a n m e r u s , w i t h a s e t a a t l n n e r d i s t a l a n g l e , 3 s e t a e o n d i s t a l 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 m n e r m a r g l n , p r o p o d u s 1 . 3 t i m e s a s l o n g a s c a l P u s , w i t h 6 − 9 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 l t s e t a e o n o u t e r m a r g i n , d a c t y l u s b i f l d 、

P e r e o p o d 5 ( F i g 2 F ) : b a s i s 4 0 t i m e s a s l o n g a s w i d e ; i s c h i u m 5 / 7 a s l o n g a s b a s i s ; m e r u s 0 . 7 t i m e s a s l o n g a s i s c h i u m , w i t h a s e t a a t l n n e r d i s t a l a n g l e a n d 2 s e t a e a t t h e o u t e r d i s t a l a n g l e ; c a I p u s a s l o n g a s m e r u s , w i t h 2 s e t a e a t l n n e r d i s t a l a n g l e a n d 3 s e t a e a t o u t e r d i s t a l a n g l e う p r o p o d u s 1 . 3 t i m e s a s l o n g a s c a r p u s , w i t h 7 − 8 s e t a l o n b o t h m a r g m s ; d a c t y l u s b i f l d ・

P e r e o p o d 6 ( F i g 2 G ) b a s i s 4 0 t i m e s a s l o n g a s w i d e , w i t h a s e t a a t m n e r d i s t a l m a r g i n ; i s c h i u m O , 7 t i m e s a s l o n g a s b a s i s ; m e m s h a l f l e n g t h o f i s c h i u m , w i t h a s e t a a t l n n e r d i s t a l a n g l e a n d a s e t a o n o u t e r d i s t a l a n g l e ; c a m u s a l i t t l e l o n g e r t h a n m e r u s , w i t h 5 s e t a e o n d i s t a l m a r g m ; 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 m e r u s , w i t h 6 s e t a e o n l n n e r m a r g l n 員

d a c t y l u s b i f i d

P e r e o D o d 7 ( F i g . 2 H ) a l i t t l e l o n g e r t h a n p e r e o p o d s 6 : b a s i s 5 . 7 t i m e s a s l o n g a s w i d e う i s c h i u m 7 5 % a s l o n g a s b a s i s m e r u s 2 / 3 a s l o n g a s i s c h i u m , w i t h m o r e t h a n a d o z e n s e t a e o n d i s t a l m a r g m ラ c a r p u s a s l o n g a s m e r u s , w i t h a d o z e n s e t a e o n d i s t a l m a r g l n ; p r o p o d u s 1 . 4 t i m e l o n g e r t h a n c a l p u s , w i t h 4 s e t a e o n m 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 o u t e r

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m a r g i n ラ d a c t y l u s b 浦 。 、

Penes(FiglK)paired,each3.7timesaslongwide

P l e o p o d l ( F i g l L ) : b a s i s w i t h 2 s e t a e o n l a t e r a l m a r g l n ; e n d o p o d w i t h 3 8 ‑ 4 0 s e t a e a r o u n d t h e m a r g l n ; e x o p o d w i t h

l 5 ‑ l 6 s e t a e a r o u n d t h e m a r g l n 、

P l e o p o d 2 ( F i g l M ) : b a s i s s h o r t , e n d o p o d t r i a n g u l a r , w i t h l 5 ‑ l 6 s e t a e a r o u n d t h e m a r g m , a n d s t v l u s e x c e e d s b e v o n q t h e t i p o f e n d o p o d e x o p o d l a n c e o l a t e , w i t h 3 1 ‑ 3 3 s e t a e a r o u n d t h e m a r g m ,

P l e o p o d 3 ( F i g l N ) : e x o p o d l a n c e o l a t e , w i t h a s u t u r e l i n e , w i t h a b o u t 4 0 s e t a e a r o u n d t h e m a r g l n

P l e o p o d 4 ( F i g l O ) : e n d o p o d l a n c e o l a t e ; e x o p o d w i t h a s u t u r e l i n e a n d 9 ‑ l O p l u m o s e s e t a e a r o u n d t h e m a r g l n ・ P l e o p o d 5 : e n d o p o d ( F i g l P ) r o u n d e d ; e x o p o d ( F i g . 1 Q ) w i t h 2 b o s s e s ・

U r o p o d ( F i g l R ) : e n d o p o d l a n c e o l a t e ; e x o p o d l a n c e o l a t e , 6 5 % a s l o n g a s e n d o p o d , w i t h s l i g h t l y s i n u a t e o u t e r

m a r g i n a n d m a n y s h o I t s e t a e a r o u n d t h e m a r g 1 , .

F e m a l e d i f Y e r s i n t h e s e x u a l c h a r a c t e r a n d n o t s w o l l e n c a l p u s o f p e r e o p o d 2 ( F i g 2 C )

E C O / o 部 ノ : A c c o r d i n g t o M r , Y o s h i n a r i , h e o b s e r v e d t h e f b l l o w i n g a n i m a 1 s 廿 o m t h e s a m e h a b i t a t : C a 〃 < 加 α

"'z""火加"α,Geo/ルeゆ"sα昨ルαα"/,即ルe"'e'αノ〃o"jca,B/ んscjα,ECのo" ro6j"o"奴Hep/age"Ia b ' o r o e ", 即 /ル ノ e 6 j a se ' WQ ツ p /e " α / 〃 o " j c a P ' o r o 力 e r " ' e s g " α "s , R ル O p a I O p m / e s p a n d 7 b g O p e r ノ α S P

E 〃 脚 o ノ o 副 ノ :I z u m i s a n a m e o f p e n i n s u l a w h e r e t h e t y p e l o c a l i t y i s l o c a t e d .

一一一毒‑ 詮…

Fig.2G"0〃碗0叩加 O脚αjz"e" 、.§p、

A : P e r o e p o d l ; B : P e r e o p o d 2 ; C : T h e s a m e o f f e m a l e ラ D − H : P e r e o p o d s 3 ‑ 7 . ( A ‑ B , D − H : H o l o t y p e m a l e ; C : A l l o t y p e 化 m a l e )

§

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l e x p r e s s m y t h a n k s t o M r , G y o Y o s h i n a r i , I D E A C o n s u l t a n t s , I n c 、 f b r h i s k i n d n e s s i n g i v i n g m e t h e o p p o m m i t y t o e x a m i n e t h e i n t e r e s t i n g m a t e r i a l s a n d o f f e r i n g s o m e e c o l o g i c a l d a t a 、 T h a n k s a r e a l s o d u e t o M r ・ T a k e s h i H o r i g u c h i ,

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References

H o e s t l a n d t , H , 1 9 7 5 . O c c u r r e n c e o f t h e l s o p o d a F l a b e l l i f e r a , G " o 〃 m o〃 α e 7 o 胴 α 、 ) ノ j H o e s t l a n d t o n t h e c o a s t o f J a p a n E a s t e m S i b e r i a a n d H a w a i i , w i t h a b r i e f n o t e o n i t s g e n e r i c p o l y c h r o m a t i s m . P " 6 / 、 S セ r o M ' 7 . B j o / 、 L a 62 2 ( 1 / 4 ) :

31‑46.

K i m , H S a n d D H K w o n , 1 9 8 5 . T h e s v s t e m a t i c s m d y o f t h e f a m i l y S p h a e r o m a t i d a e ( C r u s t a c e a l s o p o d a , F l a b e l l i f e r a ) 伽、Korea eJb "α/ 1(2):143‑165.

KWon,,.H、1990.AsvstematlcsmdyontheKoreanmarineisopodcrustaceans・IFlabelliferaPart2,Familv Sphaeromatidae.J、eU>7加.,6:l51‑192

N u n o m u r a , N 1 9 9 8 . O n t h e g e n u s G " o 両 腕 o 平 加 e γ O 脚 α ( C r u s t a c e a , I s o p o d a , S p h a e r o m a t i d a e ) i n J a p a n , w i t h d e s c r i p t i o n ofsixnewspecies.B"".Tbyα"αSMイs、,21:23‑54.

N u n o m u r a , N 2 0 0 4 , A n E v o l u t i o n a r y G l i m p s e o f t h e i n l a n d ‑ w a t e r s p e c i e s o f t h e G e n u s G " o " " oル α e γ o m α ( I s o p o d a , Sphaeromatidae)inJapanCb"Bo".Lα6.,駒ノoroU刀加,29:361‑370.

N u n o m u r a , N 2 0 0 5 S e a s h o r e i s o p o d c r u s t a c e a n s 伽 m B o n i n l s l a n d s , I s o p o d a , S p h a e r o m a t i d a e ) i n J a p a n , w i t h d e s c r i p t i o n ofsixnewspecies.B"".Tbyα"αS A〃s、,28:33‑57

Nunomura,NandKSatake,2006.AnewSpeciesofthegenusG"o河加o叩ルαeγo碗α(Crustacea,Isopoda)釦mHahajima,

BoninlslandsouthemJapanB""、TbyamaS Mイ& 29:1−6

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参照

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