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A species of the armadillid isopod crustacean from Iwate, northern Japan

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A species of the armadillid isopod crustacean from Iwate, northern Japan

journal or

publication title

Bulletin of the Toyama Science Museum

number 21

page range 65‑68

year 1998‑03‑30

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

itory̲uri&item̲id=710

(2)

ASpeciesoftheArmadillidIsopodCrusta anfromlwate,NorthernJapan

NoboruNunomura TovamaScicnceMuseum

Nishinakano‑machi,Toyama‑shi,939−8()84JAI強N

岩 手 県 か ら 発 見 さ れ た コ シ ビ ロ ダ ン ゴ ム シ 科 ( 甲 殻 綱 , 等 脚 目 ) の 1 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

コシビロダンゴムシ科ArmadilⅡdaeは従来,新潟一茨城県より南に知られていたが,岩手 県釜石市両石の飛沫帯ないしそこに隣接する潅木からコシビロダンゴムシ科の等脚類が採集 された。これは我が国における本科の最北の記録であるとともに記載された全ての種と違い

がみられる。これらの標本は関東地方ならびに韓国から知られている1台"どぬ"oobsc 鰹s

(Budde‑Lund)と最もよく類似するが,(1)胸部付属肢に剛毛が多いこと,(2)第1−3胸部 の連結構造がより深く複雑であること,(3)第1触角の先端の剛毛がより多いこと等で区別さ

れる。なお,雄の個体が採集されないので,新種としての記載は行わない。

キーワード:コシビロダンゴムシ,等脚目,分類,岩手県,北日本

DurmgafaunalsurveyonthcshoreanmalswasconductedattheneighborhoodoftheKamaishiCityタIwate Pre企cture,PacificSideofNorthemJapan,Ihappenedto血daqueerlookmgterrestrialisopodsinthe supra‑littoralzoneofseashore,Attheclosercxammalionofmhle,llprovedtobeanumeordedspecicsof thegenus姥"e〃わ.AndthisisthcnorthmostrecordofthisspeciesoflhisfamilymJapan.

V / b n e d 伽 ) s p .

(FigA〜Q)

M " 〃 j α / e x a 加 加 e d : 1 2 ¥ 子 ( 7 . 2 〜 1 ( ) . 6 m m m b o d y l e n g t h ) , s u b t i d a l z o n e a n d b u s h e s n e a r t h e s h o r e , R y o i s h i , K a m a i s h i C i t y , I w a t c P r e f e c t u e , A u 9 . 3 1 9 9 3 C O 1 1 . N o b o r u N u n o m u r a , T h e s e s p e c Ⅲ n e n s a r e d e p o s i t e d a t t h e T b y a m a ScienceMuseum(TO,強Cr‑12536〜12547)

Descr"o〃:Bodyovallanccolate,22timesaslongaswide・Colorgrayishbrownwithpalermegular pattcmsandbothsidesarcalsopaler・Eyesrclalivelysmall,cacheyecomposedoflO−11ommalidia・The structuresoffirsttosecondpereonalsomitesstronglyprolrudcd・Pleolelsonhour‑grass‑shapes,its p o s t e r i o r m a r g m a l m o s t s l r a i g h t ・ V e n t r a l s i d e o f e p m c r o n o f p e r e n i t e l ( F i g . 』 ) w i t h a d e e p g r o v e a n d s c h i s m a ・ V e n t r a l s i d e o f e p m e r o n o f p e r e o n i t e 2 ( F i 9 . J ) w i t h a d e e p t o o t h ・

Antennulc(Fig.C)smalland3‑segmented;抗stsegmcnlrectangularsecondsegmentsquare;termmal s e g m c n t w i t h 6 s h o r t a e s t h c t a s c s a t t h c t i p 、 A n l e n n a ( F i g . D ) , r e a c h i n g l h e m i d d l e p a r t o f f i r s t p e r e o n a l

s o m i t c ; F l a g c l l u m 2 ‑ s e g m e n t e d ; f i r s t s e g m e n t 2 、 8 t m e s a s l o n g a s t h e t e n n i n a l o n e ・

Rightmandible(Fig.E).Parsincisivaweakly2‑headed;lacmiamob1isthmandsingle‑toothed;

p r o c e s s u s m o l a r i s i s r e p r e s e n t e d b y a s i n g l e p l u m o s e s c t a , L c f t m a n d i b l e ( F i 9 . F ) . P a r s m c i s i v a w e a k l y 3 ‐

headcd;lacmiamob1isthmandsmgle−toothed;processusmolarisisrepresentedbyasmgleplumoseseta・

Maxillula(Fig.G).OuterlobewithlOsimpleloothalthctip;mnersixofwhicharenarrowandouterfOur a r e s t o u t c r ・ I n n e r l o b c s l e n d e r w i t h 2 p l u m o s e s c t a c a l t h e t i p ・ M a x l l a ( F i g . H ) r c c t a n g u l a r M a x l l n i p e d

Keyword:Armadmidae,Isopoda,Taxonomy,Iwate,NorthemJapan

*CorltribuUonfromtheToyamaScienceMuseumNo・'96

(3)

NoboruNunomura

(Figl).Enditertangularwilh2shorterspmesnearthedistalend;filslpalpalscgmentwithastoutscl oninncrmargm,sccondsegmcnlwith2stoutsetaconinncrmarginand3shorlersctaeterminalscgmcnt lermmaleslowardlhctipandwithabundlcofsetaeatthetip・

Pcrcopodl(Fi9.K).Basisrectangular,35timesaslongaswidc,withmanysmallspmcsandalongcr spmcsatlhemncrdistalcomcr;ischiumhalflhclenglhofbasis,innermargmwilhmanyshortsetaeand withastcmalmargin;merus2/3timeaslongasischiumwithalongbifidsctaealthemnerdistalcomer;

carpusl,51mcsaslongasmeruswith51ongselacand8−9shorlselaconinncrmarginandmanyshorlcrsctac on()utermargm;propodus,almostaslongasischium,wilhmany血crsctae()nthebasalhalfofinnermargm and3rclativclylongsetaconlhedistalhalfofinnermargm;daclylusbifid,innerfingersmall・

P e r e o p o d 2 ( F i g . L ) . B a s i s s l e n d e r w i t h m a n y s h o r t s e t a c o n b o t h m a r g i n s ; i s c h i u m l / 3 t m e a s l o n g a s

basiswilhll−l3sclaeonmncrmargmandafcwofshorlsclaconoutermargm;mcrusaliltleshortcrthan ischiumwilh21ongsetacandabout20shorlselaeonmnermarginand2shortsetaeonouterdislalcomer,

carpusaslongasischiumwith510ngcrsclaeand8shorlcrsctaconmncrmargmandmanymeselaonoulcr margm;propodusalitllclongcrandnarrowerthancarpuswith31ongersetacand6‑8shortersetaeonlnncr m a r g m d a c l y l u s b i f i d ・

Pcreopod3,Basislong,5.5tmcsaslongaswidewilh6−7selaeionoutermargmandl()−12selaonmncr m a r g m a l ; i s c h i u m l / 2 t m c a s l o n g a s b a s i s w i t h 7 − 8 s e t a e o n m n e r m a r g m ; m e r u s 3 / 4 t m e a s l o n g a s i s c h i u m , wilhalongandlOshortcrsetaeoninnermargmandasetaal()uterdistalcomcr;carpusaslongasischium,

with51ongsetacand7shortersctaeonlnncrmargmandaseriesoffmcselaeonoulermargm,propodusas longascarpuswilh51ongcrselaand3‑5shortcrsetaconmncrmargmandaboutl()sclaeonoutermargm,

d a c t y l u s b i f i d ・

P e r e o p o d 4 ( F i 9 . M ) . B a s i s l o n g a b o u t 4 t i m c s a s l o n g a s w i d c w i t h l 2 ‑ 1 4 s c t a c o n i n n e r m a r g i n i s c h i u m 2 / 5 1Ⅱneaslongaswidewilh6sclaeonmnermargmand3sctaeonoulermargm;merus3/4timcaslongas ischiumwith41ongersctacand2‑3shortcrsetaconinnermarginand2shortsetaeatouterdistalcomer;

carpusaslongasmcruswilh81ongersetaconinncrmartmand7‑8shortersclaeonoutermargm;propodusas longascarpuswith310ngersetaeand5‑7shortersctaeonmnermargmandl2setaconoutermargin;

d a c t y l u s b i 節 .

Pereopod5(Fig.N).Basislong4,5tmesaslongaswide,with6‑7selaconmnermargm;ischium2/5 tmcaslongasbasiswith210ngerand5−6shortersctaeonmnermargmandalongsetaaloutcrdislal comcr;mcrusrclativelyshortwith210ngerand5−6shortersetaeonmnermargmandasctaatouterdistal comer;carpusaslongasischiumwith310ngerand8−10shortcrselaeoninncrmarginandmanymesetacon oulcrmartin;propodusaslongascarpuswith7‑8setaeonmnermargin;dactvlusbifid,

Pereopod6(Fig.0).Basis3・stmesaslongaswide;ischiumhalfthelengthofbasis,with8‑11setae onmnermargm;merus2/3tmeaslongaswidewith210ngerand4‑6shortcrsetaeonmnermargmandascta atouterdistalcomer;carpus,aslongasischium,with610ngsetac;propodusaslongascarpuswith7‑8 1ongsetaconmnermarginand8−10setaeonoutermargin;dactylusbifid・

Pereopod7(Fig・P).Basisrelativelystoulwithalongsetaatthemncrdistalcomerand9−12small setaconbothmargms;ischiumclongatcdwilhastemalmargmonoutcrmarginand7−10shortsetaconmncr margm;merusrectangularwithl2‑13setaeoninnermargmand2sctaeattheoulcrdistalcomer;carpus rcclangularwith3stoulcrsetacand51hmncrsclaconinncrmargin,propoduswith8sctaeonmnermargm・

A l l l h c p l e o p o d s ( F i g . Q ) s m i l a r m s h a p e a n d l r a n s v c r s c ・ Uropod・Endopodslender;exopodsmall、

Re碗arks:Thcpresenlspecimensareseparatedfromtheallthespccies,bullheyaremoslclosclyalliedto 雁"ed〃oo6 ,reportedfromKantoDistriclフbutthcformerisscparatedfbrmlhclatterinthefbllowmg f e a l u r e s ( 1 ) m o r e n u m e r o u s s e t a c o n p e r c o p o d , ( 2 ) d e e p e r s c h i s m a , ( 3 ) m o r e n u m e o u s a e s t h c t a s c a l l h e t i p o f antcnnulc・UnfOrlunately,asnomalcspecⅡnenhascollected,Irefrainedfmmestablishanganewspecies.

66

(4)

Fi9.A〜Q:姥"e虚"osp.

A・Dordsalview;B・LatcralviewandpositionofnodulilatcrausC・Antcnllulc;D・Flagellumofantnana;E、Right mandible;ELeftmandiblc;G,Maxnlula;H,Maxilla;I・Maximped;J、Ventralviewofpereonalsomitesl−3;J・

Pereopod;K,Percopodl;L,Pereopod2;M・Pereopod4;N,Pereopod5;O・Pereopod6;P・Pereopod7;Q・Pleopod

l ( A l l : F e m a l e s p e c u n e n s f r o m K a m a i s h i ) .

(5)

NoboruNunomura

Referenc

A r c a n g e l i , A ・1 9 2 7 . 1 s o p o d i t c r r c s t r l r a c c o l t i n e l l i E s t r c m o O r i e n t e d a l F n i p o S i l v e s t r i ・ B o u ・ L a b ・ Z o o 1 . , G e n ・ A g r . R , S c o u l ・ A g r o i c o l t 、 p o r t i c i , 2 0 : 2 1 1 ‑ 2 6 9 .

K w o n , D H . , 1 9 9 5 . T e r r e s t r i a l l s o p o d a ( C r u s t a c e a ) f r o m C h e j u l s l a n d , K o r e a 、 K o r e a n J 、 S y s t . Z O C L , 1 1 ( 4 ) : 5 0 9 ‑ 5 3 8 Nunomura,N,シ1990.StudiesonthcTcrrestriallsopodCrustaceansinJapan,V・咽xonomyofthcfamiliesof

A r m a d i u i d i i d a c , A r m a d m i d a e a n d T y h d a e ・ B u l l ・ T o y a m a S c i . M u s 、 1 3 : 1 ‑ 5 8 .

N u n o m u r a , N 、 , 1 9 9 2 . S t u d i e s o n t h c T E r r e s t r i a l l s o p o d C r u s t a c e a n s i n J a p a n , V Ⅱ 、 S u p p l e m e n t s t o t h e t a x o n o m y ‑ 3 、 B u l l .

TovamaSci.Mus,15:1−23.

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