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駿河湾産カイミジンコAzygocypridina属の1新種

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(1)Title. 駿河湾産カイミジンコAzygocypridina属の1新種. Author(s). 蛭田, 真一. Citation. 北海道教育大学紀要. 第二部. B, 生物学,地学,農学編, 32(1): 49-56. Issue Date. 1981-09. URL. http://s-ir.sap.hokkyodai.ac.jp/dspace/handle/123456789/6386. Rights. Hokkaido University of Education.

(2) . lo fHokka i i i do Un i Journa t Se i t r t I ve s 2 IB)VO on( c onl yofEduca .3 .I ,No. Sep t 981 embe r ,1. 北海道教育大学紀要 (第2部B) 第3 2巻 第1号. A N「ew. 昭和5 6年9月. sPecies ofthe Genus Az o巧めγ後方 %α Sylvester yg ‐Bradley. fro]m suruga Bay Cent raljapan (ostracoda: Myodocopina) ,. Shimchi HIRUTA Bio l i ILaboratory Kush og ca i l l ro Co ido Un i i ege t i ve r s , on yofE社ucat , Hokka , Kush i ro085. 蛭. 田. 員. 駿河湾産 カイ ミジンコ A瑚g“父 〆 P“〆 “α 属の1新種. 北海道教育大学釧路分校生物学教室. Abstract. AI 1 eW SPeCies ofthe genus 凡矧ぎのか “〆〆 rom ”α i s rePorted f. Suruga Bay The sPecies .. longsto the A.gあろ8γ 虹ouP(Korn be i i ly di i )andi i t cker seas s ngu shabl efro1m the other ,1970 b ft h A す る彰 i h me l 町 ー ers o l rouP nt e de tai imb. e .g γg r ed structure ofthe seVenthl. Dur ing the surveys of benthos around the suruga Bay whi i ch were car r ed out by the , Research Ve 17 a 1 i iVers i sse t tute ty of Tokyo, some αれse -崩!の似 ofthe ocean Research lns , Un. f myodocop id os l specimens o t racoda werecol ectedf rom seVeralstations,and were placed at l for a taxono1mic s tudy by ~1 my di sPosa i r t tute ru ohta ofthe ocean Research 1ns , Su罫1 , i Uni ty of Tokyo Ver s . Asthef i l i th a newspec rstreport swi esofthegenus A矧ぎoの中”〆〆 ”α ,the present paperdea SyI B d l 1 t 9 5 0 b d i l f l h i h i l Veser ‐ ra ey ectedbythebeam , , ase uponasnge emaespec men ,w c wascol t F i oT 3 1 l 1 1 9 8 d i h i 3 ( ) 7 KT rawlofthe2 mspanatst 11 j ‐ t 78 o n u u r n ec r u s e ‐ ‐ g y g . , . Thetype , , i i d i di h Z l i ll i spec men s epost i ttute ty ofSc i e nt e ooogca ns ty ence Vers ,Facul . , Hokkaido Uni. Az″″oc″Pr idi ′m o兎士αi n. sP,. (Fig ) .2~5 み名 α彰 unknown. 層8欄錫a Cαmめαα (Fig 8mm inl )7 2 mm in he lvi ight linl ength atera ew .2-1 . ,2 . ,6 ,OVa i i i h l t i t i h i l f l db d d r t t t t os ru・n; ncsur w w roa a ong an er or an anteroVen ral con nuous ma rgin . no teriorly; approximate ly 38 br i les present along ventral margins becoming narrower pos st. ) ( 49.

(3) . iHI i l RUTA Sh n ch ′ 30. 020下 38 f. 5. ロ ^三 ー 玉一…“ 出三盟黙 誓 え. ′ ′ 40 50 “. い・ ・ , ,’ だ . ・ 、 , 差 . , “ ” “ ” . ・ ′ ” ◆ . ん ・ 、 一 , , ヂ , ハ . , , , ′ . . 、 r 〆 . - - ) r ・ ” , ′ ゞ ” , 」 ′ 、 “ , . r 一 ヘ ニ ・. . . ” ー ◆ ▼ ・ . ′ ◆ - 、 「 、 d ′ 、 - , ′ . ”. 、 . バ ′ . 」 . 十 . ▼ ー r き ダ 一 -おγレーノ′ 1 ー 「 〆 ぞ ( ¥ ′ . ” ‐ ′ ′ 、 ≠. 、 1 搬 い -′′ 続 暫. し 1 ” ′. J. ・. . 傘- . , . . . . . ---- .ノ. . ー尋. ing s ion tat 玉 唖g . . Location ofthesamP1 ・1. les present along anterior margin of rostrum and margin of rostru・n; a number of brist i l lar prolongation wh scontinuous chi lvage wi thlame low incisur. Se rgin be anteroventral ma ivi dual l l l ;ind tor musc e scars located anteroventral to center of she sur around inci , Adduc. ibl l ly vi e s scars not c ear . land openings i lr idge t ch anumberofg th anteriorver ca ) wi ぴ物 ” 珍 (Fig ,on whi .2-3~5 idge low r i fl b sbe are present . ,and a paro o e tseg凹nentaslong assecond;second seg士nent with eighteen ) Fi鴛云 α”彰れ7 rs 2α(Fi g , Fi ,2-6 l le of posterior margin, and one latera i l ive br t l s es on midd i br t es along anterior margin,f s l i i t ong the esal l fl s ghteenbr en啓hofsecond ledge l ta br i rdseg t s 〕mentaboutha eneardi s ;thi ,wi ddl l i ightbr t eof posterior margin ;fourth segrnent abouttwo‐ es on mi s anterior ma rginand e l i lbr i t ta i terod l es s i iorbr s t ; ixanter l ital esande ths s ghtpos hofthi thi rd y rdsleng; ,wi ,widenedds i lament thlongf le whi s i shed wi t sfurni chi thl s f i f ongsensorybr rd th seglnent aslong asthi ,wi h i h h d t l l b i i t t d e a n l l i h t e e n g ixth seg〕ment shor t long whol el en罫h ,s v a ;s ,sma , wt one s a rs e k l i i d t t h i hi l e i u s o i h b t s n e a n t t s c h r s e w p d t e n - a l l d t s e w t t g コ m t e e n e s v ,b- ry eec ; seg!nen s no cea lel i lament ength, i thf i l br salong who t shed wi eandfurn s i l ‐ br t chi sabouttwiceaslongasa ewhi s i f le off i th seg!nent and t imes as . s 5t l ong as sensory br i t s about2 e whi chi ‐br s andlong c , i l t thd es ighthsegment wi ‐br s ‐ ‐ ; i lament el en啓h furni s along whol ;e ,and g shed Wthlongf ,e,f i l d b t f i l i h t r s e s d tf ‐ i l t -a n fb n f h h b t am e s l o u g w t b t n ; l t r e a i r ‐ s b o u o d‐and e rs tes a ou one eng l i laments along who el en啓h thf i f i l thsegment . imeslongerthan sensory br eoff st threet , wi hree t d i E d i l t i lb d t e i h o o d i e n t r P t o n e s m e a p t 彰 F i 3ー1~4 ) e w Sem7 . lめ 2〆 αれ 刀”α ( g . ro o . th one l i t talbr es 〕 ヒ nent wi s s ;secondseg i thfourproximalandfourdi tseglment wi rs seg ;f lmented i l i l ta t s e and d s th one long subterminalbr ightthi l rd segpnent wi br i t ;r s e on anterior surface d f i i t t i te n ne‐seg)men e ; rs thout spine. Exopod lt ip ofl tthi ta rd seglnent wi t spine; di ef s shor lspi ihbasa nes ;. ighthseg swt lowingseg )ment ;secondtoe 〕mentscombined segmentasl ongasfol ) ( 0 5.

(4) . A newspe i ガ c e sofA親警り噛め“メ ’ 2 4f rom Suruga Bay. 》//{. 3. L. . . . \へ\. 5. L L. 2 mm. 0,5mm 1mm. 1 1 . ≧ ー う-6. ′ 、 、 ,. Fig.2. A親圏“粋パダ Z l ”αひれ如ぎn l e(Ho ) otype .sp . Fema . 1 i lview of anterior part ◆lateral view;2 a ip . med ;3 . upperl , lateralvi t to ew;4 t to,ventralvi ew;5 i .di ew;6 rst ,dorsalvi .di .f antenna .. ( 5 1 ).

(5) . Sh i l iHI RUTA n ch. 3. 4. 1 ・ . lm m 1m ○. m 0. 5m m. l l, 2 1 ラ ,斗 . l l ) メ type Fig.3. A瑚写りαめガメ o e(Ho ”” 物加in . .sP . Fema. te teofsecond antenna 1 teand endopodi ;2 .exopodi .protopodi ightsecond teofr talpartofendopodi s ofsecond antenna ;3 .di teo fleftsecond antenna;5. talpar tofendopodi s antenna;4 .di i l d i b l d i e man , me a vew.. 2 ) ( 5.

(6) . i f A newsPe ””f rom Sur c e sofA剛翌り収め“d uga Bay. i thnatatoryhai i l te wi l lbr i t ixlongbr rs t esofexopod s es th oneshortands s inthseg)ment wi . ;al n b daryteeth and anum er i h i f l b t d i t l t C e o n i 3 5 r s c F r e u c a e w bを e a n 朋 伽 di - ) ( o x a ee g g , , . , , th a row of teeth present on medialsurface near of spinules, Basale: two stout spines wi ・ l ix ( l i ight t ) br th seven ( ) or s es ef st r ; ; proximal edge of ventral margin wi proximal edge i l t thlonghai i l toutbr ivebr rspresent t thf s e wi fofventralsurface wi s es ;onelongs proximalhal ix( ight lenear middl i ) or t th one br r e l s lto midd di ta eofventral margin ;dorsal margin wi s ,s i ing onto med l alsurface, and two subterminal t l f chform a row extend t seven( )bri s es e , whi i l lmargin t lbr i l s etwiceas t ra l esonvent i te wi thtwosubtermina s br ;proximalbr t s es . Exopodi i h f l f i h t i ( ) i h t h i t ve i rg )or our e s ortandf tsegments or te longasdi rs talone :f s ,wt sx( . Endopod. o,5回m 。.2mm. l,う,4 2. Fig.4. A親翌 〆 l ひ馴め“〆 l “αo筋の n ) e(Ho ot ype .sp . Fema , 1 i l l te and exopodi ma x a e te t to i l part of t . ;2 s a , ndopodi . di ,d te endopodi t to,endi tes talpar to ff i f i ;3 s thl ;4 l l nb ,di .di .. ) ( 5 3. 4.

(7) . Sh i l iHI RUTA n ch. i imesaslongasf th t l ix( rs l f t i t s es t )ors )long Ventralbri ( r e ;secondseg力Dentaboutfourt gh ,wi 1 1 th 1br i 1 fbr i 1 1 na rdseg st es コments a number o st es on dorsa1surface andtensubtermina ;thi ,wi i 1 1c1aw,two 1ong stout c1aws,andfour br t s tdorsa es onesho r . i l 1umosebr teand l t th onelongP M 伽”‘ s enearbaseofe×oPodi ) e wi ”(Fig , Basa .4ー1~3 te le near base of thi rd endi st one bri ; other structures are unknown because of damage ,. i l t l i nalbr s es t Exopodi th one shortbr te broad wi ;outer s e on outer margin andtwolongtermi i l br iVe β‐ i l t br t i th seVen α‐ s es :outer β‐ tsegment wi te s esandf rs :f rsute margin hi . Endopodi i l l iVes i l br t i t es on medial th seVen a br i l s ender br ‐ s es t s e stout ;second seglnent wi ,f , pectnate ike wi ix are clawl l th secondary ightstout br i i tal margin,and e chs st es s surface near d ,of whi i i l i l margin, Endi te wi th aboutfourshortbr i st tes tendi es on med alsurface teeth,on d ta rs :f s lsurface te wi th ia i ledge rd endi i te wi th a number ofspines on med ta ;thi near d s ;second end l i t i l i ightbr tal marginand onelong and three shortbr es on proximal margin. s t es on s s e 、d iVepect inate i i th onepeg tesegment wi texopod 罰協力 〃粥る(Fig ) rs ,f .4-4 . Maintoothoff l i th t th two hi le i lbr es rsute br s teeth,and one p rd seg)ment wi ;four roxima st ;outerlobeofthi i landdi iVi dedinto proxima tallobes wh l i f i th seg〕 ch are s ththi es rteenbr st n nentd seg ;f )ment wi l i ix and ten br furni ths esrespectively. st shed wi i te wi th t endi l i rs t S衣劫 務雛る (Fig ) esin place of epi ;f s podial appendage , Four br .5-1 l i th aboutsixteen i te wi i f i teenbr t i l te wi th aboutf es rd endi t s s es ;th aboutseVen br ;second end i i l i t l te wi rsute th nineteen br i br es s t コ Dent h es ;end seg) s ;fourth endi ,diVidedintolarge anter or iorl i l thtweIVe t ter iorlobewi iorlobe thanumberofbr obewi lobeandshortpos es ter s ;pos ;anter i l ight t lef teen( )br t )orfour r ( s es , l i 1 4( 3十21 12十17 tal br t imb wi ) ) di th 29 ( es and 3 s s Sg粥 煽れ ”伽る (Fig ) . 5-2 , one l ,3 l i i l b t 0 d 2 1 2十2 l 3 d i 1 ) h 2 1 4 8 e s r t ( l i b i h 3 x ma s l t ) i r o t l ( 十 a n i b s a t r a n o e p m w . ; prox ma rs es t inger l ike processes ightf imb wi Terminusofeachl th e , noiaw presen. lawsexcept l h law 2 l l h hl l l i h2 9 t t E t 扉”7zα(Fi anc 5-4 aws c aw r r c s o e ) ;c ; g . ac ame a w . th claws decreasing inl law l arranged in seVen groups wi ength and/or diameterin each c. lows i i i but ol : tr roups are asf s onand number ofclawsin gl g1 roup;d 1. 1 1. 1 1 1. IV. VI. I V I. 2. 2. 10. 2. 2. 10. lef t. 5. 4. 3. 2. right. 4. 4. 4. 2. V. ide i llobe present at each s i l gen ta ) ; Gf効ぎ加‘如 and 虜関れ隣f ca 2(Fig 20唯郷7 . Spher .5-4 d ia E i l tal t n e sa teen shortbr l ike organ consisting ofaboutthi es present above geni y brush‐ s r . imen wi th 2 mm indiameter ing l d notbedetected(mi ) ′ ”功ed の望郷7 ;spec ss 2cou 知多s . . E段緊 1~1 43 eggsin brood pouch, i 1970 i essofarknownintothree )subdi 尺の吻の お. Korn ”のspec :10 vided A矧ぎ僻め “d〆 cker( h ing to thi l i i logy ofthe t s mb p ofthe seVent . Accord groups ‐based upon the morpho ,the i imbi l) whoseseVenthl sfurn shed longstothe A,gあるeγ 惇 oup(Group l presentnew speciesbe i i h t i : A. l ike processes oni tst inger ch conta ns ree spec es th onlylong recurVed f p wi ,and whi l ianear Ce jakoV l eZ欄 Rud 906 ebes )from lndones er . g湯をγ(Mul ,1961and A.sp ,and A. 厳格云 ,1 l ing i inc d Fourspec hatka Trench area K i l K i u h P i f t e s 1 1f N 6 Rud 9 t u r e ‐ am c iakoV r a c c r om o . , , 4 ) ( 5.

(8) . A newsPe i c e sofA親客ひじ 力γ靖お rom Su 2 αf ruga Bay 努. l 1 l ingui る彰γg t A.o姦ね省n rom eachotherbythenumーber ear s ef shab rouPareC r ydi .ofthe!L gす ,sP A ろ膨れ A, 脱篇云の”乙 A.sP. hl i l b h h i f i l ike Processesont etpo t esevent m ,namey .gご nger off ,and l f inger l ike ProcessesresPectiVely. ive Z Possessf A,oたたZ ghtf ,ten to e eVen, our,andei imbi i f i h i thl 1 i iabl ti sProVided ethatinthe Present new spec est e mantooth ofthef snot c. i th f ve constituent Pectinate teeth and one ProximaI Peg, ln the ten Previously known Wi l i i f i bed are on intooth ofthef he species whose ma thl n obi sdescr species t ythree,namely A, ,. 0 m ,5m .m 〇 m , . l,2 う . \. / \- . Fig Z ”α oん加Zn.sp. Female(Holotype) .5. A親翌り収め“d . 1 ixth l imb imb; 3 t to, di .s tal par ;2.seventh l t s . di ;4 .furca, ia tal l ike organ geni ,and brush‐ .. ) ( 5 5.

(9) . Sh i l iHI RUTA n ch. in ) f わ B d ,1880 i i e . The ma cker 欄 の次oの Korn ,and A. 伽めの噛 γ( ra y . McKenz ,1968 ,1970 , A.sp h d i i t o t t t t t t ix cons uen pec na e ee an ne tooth ofthese three speciesis, however,comーposed ofs ihthatof A.oた北房 . proximalpeg ,in contrast wt larmamenthasnotaxonomic i d k 1 1 9 6 t R d ) i ontheotherhand ( o n e outthatthefurca o p , u a v ion i i but t i i fthegenus A 馴goC“)“〆物αthe numberandd r s ign i f i s cance ,because n some spec es o iab1 1 1ae are var ightand1 e t1a江 I e ef ofthefurca1c1aws on ther . The present new species, as inc 1 1a tcharac ter t 1awsoneachlaα i ionofc - i but f ferentd I s t e descr i bed above,a1 r s ;nodi sohasdi ingui l l i i i t rom theother members ofthe genus Weredetectedin sh A.○力ね雀f s ear st cswh chc y di logy ofthe furca, the morpho ) 13一Vn-’ 78 f伽eれ e%の肌粥gd Sめec e( ; KT-78一11 . . Holotype: ovigerous femal i i h l ty h fo R t t t S o t u e vers l r n s n e s e a c tedinhonourofhdr c e a Thespeciesnamewasse ao ec ,Uni .. of Tokyo .. o o 43 34 3N 138 7低 56 f Toi Lo餌おか. Suruga Bay : of . . . OT-3 ( , St. o o 43 6E) 34 55 5N 138 ; , .. depth388~395 m; mud .. Acknowl edgements i t tute l wi r sh to express my thanks to ~l , . Suguru 。hta of the ocean Research 1ns d i i i h i t i t r s i Uni ty of Tokyo who gave methe opportunty to exam ne e spec men repo e nth vers i in ve Research ofthe i tedinpartbythe Grant ‐operat ‐ ‐AidforCo tudy wassuppor ss paper Th ,. i ion ture ject No Min i t enceand Cul s ry ofEducat ,534033 . .434042 and No ,Pro ,Sc. References i t i l ina)f c ocean e Trench and the Antarc rom the Per Ch Korni t . rac。da(Myodocop cker .1970 . os , L. S l 1-42 Smi ths r . .Zoo .32: .Cont )f rom the t : MyodocoPa rac。da i MCKenz ( 戒め“霞ァm (os ecord forthe genus Aの獲り e . A new r , K. G. 1968 4f i 3 8 9 3 9 5 2 A Z l 8 0 一 l i 1 ( L ノリ s A W t t : g Southeas t n z r o o r a n a e s ern us a . , . . . I i i 1一40 iboga EXPed i i t S るo t e30: M [ l l t l ーEXPed on ロ u . racoden der sす e os er g ,9P . S . Di .1906 ,G.VV i l i in i dae f i l Cypr d the Kur f ‐Kamt chatka i ft h e r om d A 1 A m 1 9 6 t Rud o e a s e c e s iakov J e w o s r a c o y n p . ,. . igs 2 93-97 ) Trench ar taceana3( : ea . ,2f . Crus. ) ( 6 5.

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