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A new species of the genus Gnorimosphaeroma (Crustacea: Isopoda: Sphaeromatidae) from brackish waters in Nagasaki, western Japan

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A new species of the genus Gnorimosphaeroma (Crustacea: Isopoda: Sphaeromatidae) from brackish waters in Nagasaki, western Japan

journal or

publication title

Bulletin of the Toyama Science Museum

number 34

page range 61‑65

year 2011‑03‑15

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

itory̲uri&item̲id=942

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富山市科学博物館研究報告第34号,pp61‑65;(2011)

ANewSpecieS0ftheGenuSG"⑪"碗OS〃ん ノw"a(Crusta a:I poda:Sphaeromatida⑧ fromBrackiShWaterSinNagasaki,WesternJapan

NobomNunomura ToyamaScienceMuseum

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

長崎県雲仙市の土里川河口域から発見されたイソコツブムシ届(甲殻亜門:等脚目:コツブムシ科)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1‑8‑王

長崎県国見町(現在は雲仙市)の土黒川河口の汽水域から発見されたイソコツブム シ属等脚目を新種G"or""o叩ルαe'o'"α〃唇o"ocα"ぬ"' [和名:カドバリコツブムシ,新 称]として記載した。本種は腹尾節後端が三角形であることから同属の他種と区別さ れるが,さらに比較的類似しているGcルノ"e"seとは第2小顎の剛毛数が多いことから

も区別される。

キ ー ワ ー ド : 等 脚 類 、 コ ツ ブ ム シ 科 、 カ ド バ リ コ ツ ブ ム シ 、 新 種 、 日 本 Keywords:Isopoda,Sphaeromatidae,G"o〃"70噸ルαo"?α,newspecies,Japan

ThegenusG"o " 平方α O脚αischaracterizedbyhavingramiofpleopods4‑5,exopodofpleopods3‑4 b i a r t i c u l a t e , e v i d e n t b u t n o t m a r k e d l y e l o n g a t e d p e n e s , s h o r t f l r s t p l e o n a l s o m l t e , a l a r g e s e c o n d p l e o n a l s o m l t e c o n s l s t ‑ 1ngof2incompletesuturelinesandfbnningapleotelson(digested廿omMenzies,1954).

Twentv‑fbul・sDeciesoftheEenusG"o〃"7o "e/℃"zahavebeenrecorded廿omthemarine,brackishandけeshwater envlronmentsofWestPacifIcareaandCalifbmiaUSA・Amongthem,21specieshavebeenrecorded廿omthevarlouS partsofJapan(Hoestlandt,l975Nunomural998,1999,2004,2006,2007),anditsneighboringarea(She、,1936&

Kussakin,KwonandKim,1987;KwonandKwon,1985;Kim,andKwonl988)

ExaminationofarelativelvlargecollectionofG"o〃"ZoSpルα9m"7acollectedbvDr・Tenlolriehasrevealedtheexistence o f a d i s t i n c t i v e u n d e s c r i b e d s p e c i e s o f t h e g e n u s G " o r " " o S p ル α e ノ ℃ 加 α , c h a r a c t e r i z e d b v t h e s q u a r i s h , i n s t e a d o f 2 e n t l v c u r v e d 、 posterlormarginofthepleotelson,Inthispaper,thisspeciesisdescribedasnewonthebasisofmaterial廿omtheestuarv ofHiiikuroRiver,KunimiTown(present:UnzenCity),NagasakiPrefecture,underthenameofG〃/go"ocα"血加

Thetypeseriesisdepositedasfbllows:TovamaScienceMuseum,Toyama(TOYA),theNationalMuseumofNa‐

tureandScience,Tokvo(NSMT),KitakvushuMuseumofNaturalHistorvandHumanHistoIy,Kitakvushu(KMNH).

OsakaMuseumofNamralHistory,Osaka(OMNH).Sizeofspeclmensisindicatedbythebodylength(BL)measured homthemidpointoftheanterlormarginoftheheadtothemidpointoftheposterlormarginofthepleotelson.

TaxonomV

U

G"。〃腕 〃んα 0碗α〃Zgo"0cα""""zsp・nov.

( N e w J a p a n e s e n a m e : K a d o b a r i ‑ k o t s u b u m u s h i )

( F i g 」 )

*ContributiorlsfTomtheTovamaScienceMuseum,No.407

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N(〕boruNunoⅢur墨

MIre"α/exα",腕e乱Holotype:3(BL5.2mm,TOYACr‑23279),mouthofHUikuroRiver,Funazu,Taira‑cho,

KunimiTown,NagasakiPrefEcmre,l4Januaryl962,collTeruolrie・Allotype:早(34mminbodylength,TOYA C r ‑ 2 3 2 8 0 ) , 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 : 1 0 ケ 3 ( 4 8 ‑ 5 6 m m i n b o d y l e n g t h ) , 4 早 早 ( 3 0 ‑ 3 . 7 1 n m i n b o d y l e n g t h ) , 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 a r e d e p o s i t e d a s l b l l o w s : 3 c ? J a n d l 早 ( N S M T ‑ C r 2 1 2 5 8 ) a t N a t i o n a l M u s e u m o f NatureandScience,Tokyo;2c?Jandl早(OMNHAr‑8375);2Jc7(KMNHIVR‑500,505‐500,506)andl早

(KMNHIVR‑500,507).3ケケ(TOYACr‑23281‑23283)andl早(YOYACr‑23284)atToyamaScienceMuseum.

D c'""o〃M1/eBody(F唱,1A)20timesaslongaswideColorwhiteinalcoholEyesmediocre,eachwith 2 4 o m m a t i d e a ・ P o s t e r l o r s u t u r e l i n e o n p l e o t e l s o n l o n g e r t h a n a n 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 t r l a n g u l a r , w i t h a n g l e a b o u t 9 0 o d e g r e e s 、

A n t e n n u l e ( F i g l B ) w i t h 7 ‑ s e g m e n t e d f l a g e l l u m A n t e n n a l H a g e l l u m ( F i g l C ) w i t h l O ‑ l 2 s e g m e n t s F r o n t a l l a m i n a ( F i g . 1 , ) o f c e p h a l o n t r l a n g u l a r , c l y p e u s ( F i g l D ) e l l i p t i c a L R i g h t m a n d i b l e ( F i g 」 E ) w i t h i n c i s o r p r o c e s s 3 ‑ t o o t h e d , l a c i n i a m o b i l i s 2 ‑ t o o t h e d ; m o l a r p r o c e s s w i d e ; p a l p 3 ‑ s e g m e n t e d , w i t h 3 s e t a e o n s e g m e n t 2 a n d 4 s e t a e a t t i p o f s e g ‐ m e n t 3 L e f t m a n d i b l e w i t h i n c i s o r p r o c e s s 4 ‑ 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 ; m o l a r p r o c e s s w i d e M a x i l l u l a ( F i g l F 〉 w i t h m e s i a l l o b e b e a r i n g 3 p l u m o s e s e t a e ; l a t e r a l l o b e w i t h l l s e t a e i n c l u d i n g s e r r a t e d o n e s , M a x i l l a ( F i g l G ) w i t h 8setaeonmesiallobe;4setaeonmiddlelobeand3setaeonlaterallobesoftheouterramusMaxilliped(FiglH)

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 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 i n a n d 8 ‑ 9 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 2 1 o n g e s t , w i t h 6 s e t a e o n 1 n n e r m a r g l n ; s e g m e n t 3 w i t h l l ‑ l 2 s e t a e o n l n n e r m a r g i n ラ s e g m e n t 4 w i t h 5 s e t a e o n i t s i n n e r m a r g l n a n d l ‑ 2 s e t a e a t o u t e r d i s t a l a l ・ e a , s e g m e n t 5 t a p e r l n g t o w a r d t h e t i p , w i t h 7 ‑ 8 s e t a e a r o u n d t h e

wholemargln

P e r e o p o d l ( F i g l l ) w i t h b a s i s 3 6 t i m e s a s l o n g a s w i d e , w i t h l 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 O , 7 t i m e s a s l o n g a s b a s i s ; m e r u s h a l f l e n g t h o f i s c h i u m , w i t h l s e t a a t l n n e r d i s t a l a n g l e ラ c a r p u s t r l a n g u l a r , w i t h 3 ‑ 4 setaeonlnnerlnargm;propodusO、7timesaslongasbasis,with6−7setaeonmnermar91n.

P e r e o p o d 2 ( F i g l J ) 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 , w i t h l 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 q 6 t i m e s aslongasbasis,with2setaeonoutermarg1n;merus0.55timesaslongasischium,with2−3setaeonlnnermargln and2setaeondistalouterangle;carpusO、8timesaslongasmerus,with2setaeonmnermarginandlsetaatouter d i s t a l a n g l e ぅ p r o p o d u s 2 、 O t i m e s l o n g e r t h a n c a I p u s , w i t h 2 s e t a e o n l n n e r m a r g l 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 ・

Pereopod3(FiglK)longerthantheprevloustwopalrs,withbasis30timesaslongaswide,withlsetaatlnner d i s t a l a n g l e ; 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 , w i t h l s e t a a t m n e r d i s t a l a n g l e ぅ 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 , with2setaeon1nnermarginand3setaeatouterdistalangle;carpusaslongasmerus;propodus1.2timeslongerthan

CalPus、

Pereopod4(FiglL)withbasis39timeaslongaswide;ischiumO、7timesaslongasbasisラmerus0.7timesas longasischium,with2setaeonlnnermarginand3setaeonoutermarglnラcarpusaslongasmerus,with2setaeon lnnermargmand2−3setaeonouterdistalareaラpropodusl、41ongel・thancarpus,withlsetaon1nnermargln、

Pereopod5(FiglM)withbasis43timesaslongaswide;ischiumO、7timesaslongasbasis;merusO6times aslongasischium,with3setaeatlnnerdistalangleandouterdistalanglerespectively;calpusslightlylongerthan merus,with7‑8setaeondistalmarglnラpropodusl5timeslongerthanmerus・

Pereopod6(FiglN):basislong,55timesaslongaswidewithlsetaatnearmnerdistalangle;ischiumO,7 tlmesaslongasbasis,merusO、55timesaslongasischium,with4‑5setaeatouter1nnerdistalangle;carpusaslong aswithaseriesofsetaeonlnnermargmラpropodusl3timeslongerthanmerus・

Pereopod7(FigJO):basis43timesaslongaswide,withlsetaatmnerdistalangle;ischiumO、7timeslonger thanbasis;memsO、6timesaslongasischium,withlsetaatlnnerdistalangleand3‑4setaeonouterdistalangle carpusalittlelongerthanmerus,with4setaeonlnnermarglnand4−6setaeatdistalmargm;propodusl3times longerthancarpus,with2setaeonlnne1.1narginand2setaeondistalpartofoutermal・gln・

Penes(FiglP)paired,each3timesaslongaswide・

Pleopodl(Fig)withbasisbearing3couplinghooksonlateralmarg1n;endopodwith20‑22setaeonmarg1n;

exopodwithl8‑20setaeonmargln.

62

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ANewSpeclesofG"oノ・』"地平7" o"7雪

Fig.1.G"0""'0噸" '0"'α〃噌。"ocα "" §p・nov、HoIotype,male,TOYACr‑23279.

A,habitus,dorsalview;B,leftantennule,dorsalviewぅC,antenna,dorsalview;D,clypeusand廿ontallamina,ventral

v l e w ; E , r i g h t m a n d i b l e , v e n t r a l v i e w ; F , l e f i m a x i l l u l a , v e n t r a l v i e w ; G , r i g h t m a x i l l a , v e n t r a l v i e w ; H , l e f t m a x i l l i p e d ,

v e n t r a l v i e w ラ I , l e f t p e r e o p o d l , f i ・ o n a l v i e w ; J − L , r i g h t p e r e o p o d s 2 ‑ 4 , f i ・ o n t a l v i e w ; M − O , l e f t p e r e o p o d s 5 ‑ 7 , f i F o n a i

vlewうP,penes,ventralview;Q−U,lefipleopodsventralviewl‑5;V,lefiuropod,dorsalview(All,holotypemale).

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Nob(〕rllNunomllr墨

P l e o p o d 2 ( F i g l R ) w i t h b a s i s b e a r i n g 3 c o u p l i n g h o o k s o n l a t e r a l m a r g m ; s t y l u s c l u b ‑ s h a p e d ; e n d o p o d w i t h l 5 ‑ l 7 s e t a e o n m a r g 1 n e x o p o d , w i t h l 2 ‑ l 3 s e t a e o n m a r g l n ; e x o p o d w i t h a b o u t 3 0 s e t a e o n m a r g l n ・

P l e o p o d 3 ( F i g 」 S ) w i t h b a s i s b e a r i n g 3 c o u p l i n g h o o k s o n l a t e r a l m a r g l n ラ e n d o p o d w i t h l 4 ‑ l 5 s e t a e o n m a r g l n ; exopodwithasumrelineandabout25setaeonmargln,

P l e o p o d 4 ( F i g l T ) w i t h b a s i s b e a r i n g l 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 ; e n d o p o d l a n c e o l a t e う e x o p o d a s u t u r e l i n e ・ P l e o p o d 5 ( F i g l U ) w i t h b a s i s b e a r i n g 2 c o u p l i n g h o o k s 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 4 s e t a e o n m a r g l n ;

exopodwithaboutlsetaonmargln・

U r o p o d ( F i g l V ) w i t h b a s i s a l m o s t s q u a r i s h う e n d o p o d l a n c e o l a t e , w i t h n u m e r o u s 師 e s e t a e o n b o t h m a r g l n s ; exopodshort,45%aslongasendopod.

Dis"め""o〃α"dルα6" Thisnewspeclesoccursinbrackishwateroftheestuaryofmouthof町ikuro‑gawa

R i v e r .

E " 脚 o / 0 9 〕 ノ . ・ T h e s p e c l e s n a m e 〃 r o ノ 忽 唱 o " o c α " 血 沈 〃 加 印 " 加 g 1 1 t r i a n g u l a r t a i l 1 1 r e f b r s t o t h e t r i a n g u l a l ・ p o s t e r l o r m a 昭 1 n ofpleotelsonofthenewspecies、Genderofthegenusneuter.

Re碗肋.ThepresentnewspeciesismostcloselyalliedtoG.c力加eshen,l936known廿ombrackishwatersln E a s t A s i a i n h a v i n g s h o r t e x o p o d o f u r o p o d a n d f e w t e e t h o f m a x i l l a , H o w e v e r , t h e n e w s p e c i e s i s s e p a r a t e d 廿 o m G c ル ノ " e " s e b y t h e f b l l o w i n g f b a m r e s ; a n g u l a r , p o s t e r l o r m a r g i n o f t h e p l e o t e l s o n , w h e r e a s l ・ C u n d i n G . c ル 加 e " s e , . p r e s e n c e of9setaeon1nnerramusofmaxiⅡainGro〃go"ocα"ぬj脚,whereas4inGc〃"e",.respectively,4and3setaeon lnnerlobeandinnerIobeofouterramusofmaxillainG./o7Igo"ocα"ぬj脚,whereas3and2inGc方加e"se・

M a l e s p e c l m e n s a r e l a r g e r t h a n f b m a l e s ( B L e x c e e d i n g 4 8 m m l n m a l e s , w h i l e l e s s t h a 、 3 . 7 m m i n f e m a l e s ) i n thisnewspecies・ThissuggeststhattheG.〃壇o"ocα"ぬノ加、ightbeaprotandrichennaphrodite,asseeninG.

"αc"o"ge"se(Kwon,andKiml987)(cfFukuharaetaL,2000).

RefErenc

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e s s o f S e x ‑ c h a n g e 廿 o m F e m a l e t o M a l e o f G " o 河 加 o S p ル α e γ o " ' α 〃 α " o " g e " s e ( C l u s t a c e a : I s o p o d a ) . M セ 加 o " s Q / γ ル e Rzc"/〃Ecα"o〃αH2""α〃此花"Ce(M、"α/Sc花"Ce),Ⅳ"gr"αU""ersj〃3(1):45‑52

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Qf砂szemα"cZoo/ogy、3(1):51‑56.

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Menzies,R、J、1954.AReviewoftheSvstematlcsandEcologyoftheGenus1'EXC〃α〃O脚α'withtheDescriptiono賞 aNewGenus,NewSpecies,andaNewSpecies(Crustacea,Isopoda,Sphaeromidae)4"'e"cα〃Mi'se"m〃ov"α/

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ANewSpeclesofG"oJw"o,勉方αgノ。o"7α

Nunomura,Nl9 AnewspeciesofthegenusG"o""'oSphae'℃"'a(Isopoda,Sphaeromatidae)師mthemouthof TondaRiver,KiiPeninsula,southernJapanB""e"〃Q/7byα",aScje"ceM"sez"〃22:l‑5

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Nunomura,N,2007.ANewSpeciesoftheGenusG"o""7ospルaeJ℃"7a(Crustacea,Isopoda)廿oma丘eshwaterstream oflzuPenmsula,middleJapanB"昨m7byα"7αSc/e"ceM!se "",30:37‑42

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Shen,CJ・ 936.The廿eshwaterisopodsofPeipingB""e"〃Q//ルe 〃A化加o"α〃" ""eQ/Bjo/ogy,Pejp加97:l‐

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参照