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(1)Two. New. Species. DeepISea. Isopoda:. (Crustacea. Janirella. of. 1896. Bonnier? Sagami. Asellota) from. Bay. By. GAMO*. Sig･eo. April. (Received. Deux. R6sum6.. nouveaux. de. ont占t占r占colt占es bicornis sp. nov. 7,210-7,230m. るpines. sur. apicaux. s,en. The. present. nov.,. par. Birstein,. la presence. ′. large. d･un. presence. sp･. Sud,. l'Atlantique. (Isopoda, Asellota). Janirella profondeur･ Nord, 1963, du Paci丘que ′. il diffさre par. I. rotundifrons de. la. de. nov･. 4,588 rostre. plus. de. m･. deux. de. est. massif. deals. paper. I. rotundifrons. and. Oshima. the. of northeast leg. 2 of the. sp.. qui. in. Bay･. Sagami. collected the. gray. In the from. (BIRSTEIN, 1915;. Janirella. off. KH-80-1,. University. of. (HESSLER 1,678m,. and. basaltic. 1896,. BoNNIER,. species. twenty-eight. have. been. de-. Oceansl depths of the Pacific and Atlantic A,and abyssal 1896; RICⅠiARDSON, 1908, 1911 ; STEPHENSEk, b, 1971 ; BoNNIER, bathyal. the 1963a,. WoLFF,. from. bottom.. muddy. genus. cruise. Institute,. Research. Ocean. of the. During. bicornis. Janirella. core. and. scribed. orn占de. est. by USNEL box were the taken specimens Station S-1-1 (35o52,1′N, 139o28.2′E), depth 1974) at. sandy. mais. profondeur,. were. the. JuMARS,. de J･. proche. isopods,. bathyal. new. (Janiridae), which. nov.. lsland. Hakuho-Maru. R/V. two. with. 人. Tokyo,. larges. tubercules.. petits. sp.. 1962,. Janirid6s. macrura. dont. profondeur, le rostre.. distingue. Sagami,. de I.. raproche. Menzies,. magnifrons il. se. de. de. 1,678m.. bathyaux. esp占ces baie de. la. 21, 1982). 1962).. None. of the. have. species. been. from. recorded. the. Japan. prOper･. The. are in the autbor's collection specimens preserved After in future, that, the specimens will be acomplished.. holotype. study. is. to. National. the I. am. Science. grateful his kind much. for. Horikoshi,. of. the. facilities for the. study ･. study. ｡f. members of the. members was. help.. during. the. Hodogayaiku,. I. gave. who. by. Biology,. permanent. the･. transfered･. preservatoin･ Masao lwasa, of the. Emeritus. Seikei. Masuoki also ､grateful to Professor lnstitute, University for providipg of Tokyo, are And due ,to thanks also my cruise. am. for their. the月/V.Hakuho-Maru s･upported. Of. for. Professor. Research. Institute. partly. D印artment. Tokiwadai-,. Ocean. Tokyq, to. extremely. university,. staff. Museum,. untill. kind. their. me. -the. geneLral. help for. the. assistance. l･in,many Scientiac. and′上he. ways･しThis Res:earch (Nor. yGrant-in-Aid Faculty. Yokohama,. of 240,. Education,. pJAPAN･. IYokohama. National. Uhiietsi軌.

(2) 2. S. GAMO. 534033) from. Ministry. the. of Education.. bicornis. Janirella. nov.. sp.. (Fig.1) DescrlPt10n･ body. is highly the. as. of bristles. rows. The. segments.. the. a. has. long. a. third. long. polnted. AIl last. peraeon. first. one. with. two. or. 1, 5. segments. Tbe. between measured is end rounded.. the On. Size. of the. segment. 1/2 times and Theflagellum is composed long. last. the. and. one. Thefirst than. of. a. and. the. subequal. three. long. a. of the. third. rudimentary. exopodite. of the. peraeon. peraeon. preceding. is. which. The. posterior are. projections wbicb at. splne. short. is. (Fig. 1, B) segments. 1. about. combined･ is the lorlgeSt,. segment. second. apex･. each. end.. (ITig. 1, C) is. antenna. long. as. is. which. furnished. width,. alld third. the. the The. ones.. and. projection.. antennule. ; the. is about. segment. four. maximum. a. second. at. short side. and long. second. posterior. lateral. with. segments. aestbtasc. segment. peduncular. the second;. splnules. bears. the. the. three. of the. rounded. processes.. the. lateral. are. provided. peduncle. as. short. of. splneS. the. than. posterior. and. Of. than. two. as. end. equal. have. long. there. side,. ln. 2-4. as. of the. each. increaslng. as. 3/4. about bases. process. the large. the. comparatively is on each. ∫)is shorter. and. a. two. pleon. apICal spine. in length, excepting. wider are. segments. palr. has. large. a. nearly. are. bears. cephalon. and. are. segments. peraeon. and. tergum are. and. reaches a. anterolaterlly;. splnules,. (Fig. 1, A). (Fig. 1, A. together,. successively Thefirst. lateral. spines; apical 6, while the segments. pleotelson. segments. Of the. one. and. The. segment.. almost. and. directed. are. which. three. of the. processes. antenna. margln. with. segments. The. one.. lateral. outgrow￣tbs. is provided. outgrowth. peraeon. which. rostrum,. of the. segment peduncular The anterolateral apex.. the. at. third. granules. with minute spiniform the dorsum the cephalon, peraeon of. on. cephalon. the. at. long. as. There. covered. and. The. a. occurlng. width. calci丘ed. four. 2･5mm･ female, length about Juvenile Its length is 2 and 1/3 times dorsoventrally. is. holotype. compressed. maximum. is thick, or. The. the. as. transformed. little shorter. a. it bears. and. second, into. a. splne-like. projection.. The. The inner. endite. of the. margin in. longest. hairs. Fig.. portion 1, DJ.. in. shown. the. distal. which the The. endite. on. The dactylus provided. three. the. has with. a. peraeopod spine two. near. large. The. segments,. somewhat of the inner. the. distal. splneS. On. are. coupling. expanded, and. are. maxilla. hooks. of the. segment. awl-shaped. alld furnished. the. on. palp as. as. is the as. vide vith. 丘ne. ones;. the. marglI1.. is. H). 1,. second. the. and. three. wbicb. is. (Fig.. maxillule,. (Fig. i, G) has. straight.. proximal. epipodite. the. 皿andible,. maxilliped. is almost. distal portion. first. the. of. inner the. than. shorter margin; inner. the. margin.. the. following. carpus. The. is. other. robust. and. peraeopods.

(3) Two. New. Isopods. Deep･Sea. of. Janirella. A. Bonnier,. 1896. B師F ･ヽ. C. A-･伝-∼-1'''. '2. G -A= ￣ I-d.メ.∫. A/. =L':A. ･. ･･･j---￣'主. D. もヽ. ::.I.:il ■. I＋-■. ..---1^. つ. Iつ■-. ∫. I.i. '0. ...･･. .. H. ＼. t. _-. Ⅰ. -一一--t--･､. (￣￣‡. ど. pl.2. i-: -s.. K. up･￣｢. Fig.. l.. A:. portion I:. ∫ bicornis. Janirella body,. second. ventral. OM. up. b-m. dorsal. of marldible. peraeopod.. view,. B:. K-M:. E:. I:. bolotype. nov.,. sp･. view.. antennule.. maxillule.. F:. pleotelson. with. third. (K). juvenile C:. to丘ftb. proximal G:. maxilla.. second. (M). female. (length,. portion maxilliped.. pleopod. pleopods.. L. of. 2･5mm)I. about. D:. antenna･. H:first. (pl. 2) and. distal. peraeopod.. uropods. (UPI)∼.

(4) 4. S.. (Fig. 1, Ⅰ)are The. rather. second. pointed. distal. the maximum bears. a. hairs with丘ne The endopodite. having. than. shorter. much. long. three. the. endopodite. setae;. and. outer. of. pleopod The. (Fig･ 1, M). margln. the. exopodite. and. long. a. bears丘ne. is wide in shape. and oval (Fig･ 1, J; up･) is very short, widened. uropod two. unequal. distal. the. segments;. and. the. on. twice. no. proximal. The. apex.. fifth. it. uniramorus;. is. segment. apex.. has. and. the. at. the. at. narrow. hairs. seta. plumous. furnished. and. seta. the. on. setae. plumous. bare margln entire outer and a long 1, is the fourth (Fig. L) pleopod rather. hairs. portion. of. is. the of. the. almost. endopodite. exopodite. on. marglnal丘ne. and. narrow.. the. portion;. sists. to one similar in appearance another. (Fig･ 1, ∫; pl. 2) is somewhat oval in shape with bluntly is about The 2/3 of its length. width third pleopod. slender. pleopod. apex;. (Fig･ 1, K). CAM(ラ. con-. the. as. as･1ong. one.. proximal Material･ 1eg･. 2, 1UV. 139o28･2/E, by. collected. from. off. ll･5mm,. aplCal. but. spines,. Research. the. is. nov･. sp･. Sta.. Institute,. like. Tokyo),. of. bottom;. Birstein,. J･ macrur?. to. (KH-80-1,. gray muddy March.1980.. sandy and 12.50-14.15hリ7. very. S-ト1. University. basaltic time. core;. the. apex. the. of. is. pleotelson. is derived. bicornis. name. On. 1,678m,. 2.5mm;. about. 1963,. Kurile, 7,21017,230m deep, by a female northern specimen, former differs from latter in that the rostrum the the has. add. specific splIleS. aplCal. Ocean. box. bicornis. J･. described. The. length. depth. USNEL. the. Remarks･. two. holotype,. Hakuho-Maru,. 34o52･1/N,. length. Juvenile. 1?. from. the. not. polnted.. presence. of. a. Of large. pair. rostrum.. Janirella rotundifrons. nov.. sp.. (Fig.2) Descrlption･. The. paratype. is compressed maximum. calcified. a. large,. beyond. the. of the. rostrum. of. the. and. broad end. and. cephalon. anterolaterally,･. and. with. peraeon. processes. lateral. 1, 5 and. large. 6;. second. the aplCal. splnules;. the. four. process. one. 3 times. than. more. third. peraeon. which. two. as. cephalon. and. extends. The. granules･. of the antenna･ The anterolateral. unequal. round. large. outgrow-ths. marglnS margln are. which. is furnished. outgrowth. is. tergum. The wide. the. as. The. granules. long. as. segment. tuberculate. posterior. is. long. as. segment･. tuberculate. Jminute. into. 2.2mm, about and a The body (Fig. 2, A). with. lateral. Splne.. segments. of the. the. rostrum,. produced. The免rst. one･. lateral. a. is. length. holotype･. the. as. peduncular. bear占minulte. splnules last. with. rounded. of the is. at. female,. Juvenile lわng. Its length. covered. directed. All. about. is found. which. a. as. dorsoventra11y･ width. thick, has. is. holotype. juvenile fema一e,. (Fig. 2, A). are. segme■nts. are. peraeon. process. the. segment. is. on. 1. in. equal. wider are. segments. lateral. of. nearly. than. the. length,. each has. side no. short. of the. apical. ones.. posterior. comparatively. and. peraeon. spine;. the. excepting. The. furnished segments. the. peraeon.

(5) Two. New. Deep-Sea. Isopods. of. Janirella. Bonnier,. 1896. ＼. r. ∈. E. ∈. LJ1. Ln. ⊂⊃. Ⅰ. ●. ●. 1Jl,メ ∼-. ⊂⊃. tヽL. pl.2. b-m. K. ､. ∫. up Fig.. Janirella. 2.. sp.. rotundifrons E:. D:. tenna.. mandibles. Ⅰ: second peraeopod. K-M: (up.), γentral view.. pod.. juvenile about. as. female,. length,. long. the. as. nov.,. maxillule.. A:. body, F:. up. dorsal. maxilla.. 悼㌦. C: B: antennule･ viewI G: maxilliped. H:丘rstperaeo･. an-. second (pl･ 2) and uropods ∫: pleotelson with pleopod bolotype (M) (A-C ∫: pleopods･ and third (K) to丘fth K…M: 2.2mm. D-H paratype juvenile female, about and. holotype)..

(6) 6. S. GAMA. 2-4. segments. have. aplCal splne. The pleotelson. posterior. end. long. splne. is about. twice. the. second. the. apex.. The. segment. segment. is. and. of the apex.. is rather. fourth. is. consists. rather. of eleven. The. The. as. the. as. the. middle. margln. setae. and. times. third. tubercules inner. the. segments. the. at. segment. The. combined. long. as. the丘fth.. as. together,. se宮mentS. peduncular. the. The丘fth. third.. 1/2. and. at. aesthetasc. minute. spine. the. segments;. second;. of. end. stout. segment. of the pleotelson.. with. the. little. a. second. long. the. as. proximal. 1. six. the. provided. to. three. a. long. a. is. of three. bears. to. reaches. about. as. in Fig.. 2, D.. The. and. longer. than. the. and. the. shown. second. (Fig. 2, E). maxillule. The. segments. hairs. with負ne The. has. first segment. it. and. the. of. palp. third.. (Fig. 2, F). maxilla. three. with rather. slender. The distal. almost. is widely. third. are. type'for. normal. furnished. and. appearance. and. distal. with丘ne. The. apex.. the. the. endpodite vithout. minute,. and. hairs. on. of the marglnal. it bears. three. furnished. and. the The. following. the. carpus. other. is robust. ones;. and. the. provided. (Fig. 2, Ⅰ)are. peraeopods. in appearance.. has. end;. the. margln. than. margln;. of. margin. among. in shape. lanceolate inner. inner. the. on. longest. the. shoter. margin.. similar. (Fig. 2, K). on. setae. is. inner. inner. truncated;. pleopod. of. the. (Fig. 2, ∫; pl. 2). pleopod. is. of the palp is somewhat. the. the. on. and. second. end. plumous. splneS. spines. On. hooks. coupling. (Fig. 2, H). peraeopod. two. two. epipodite distal portion. the. on. first has. dactylus. narrow. the. the. consists one. and. nearly. elongate,. (Fig. 2, G) maxilliped The segment endite. second. the. the. with. genus.. basal. and. second. as. The. The. provided. (Fig. 2, B). together;. bears exopodite is about subequal. long. as. are. long. as. and. segments.. mandibles. is about. width, The projections. are lateral three. one. natennule. last. the. and. which. long. as. is about. the. The且agellum. the. as. segment. nearly. robust,. segment sixth The aagellum. the. long. exopodite The segment.. The. stout. peraeon. preceding. there. posterior. and C) nearly reaches is short, about 1/2 as. rudimentary fourth. the. a. the皿aXimum. as. side,. Segments. third.. largest,. segment as. about. of. following. (Fig. 2,A. peduncular. peduncle. the. as. is the. Tbe丘rst. than. unequal. long. as. antenna. a. of the. two. the. larger. are. each. four. lateral. second. On. bears. of which. apex.. each. segment. than. shorter. anterior. the. of. truncated,. of which. at. The丘rst. bases. the. broardly. tvo. projections, a. between. is. the. processes,. than the and ∫)is longer 1 and 1/6 times as long. about. and. is measured. which. A. (Fig. 2,. together,. segments. lateral. two. is. s′omewhat. maximum the. the. exopodite. the. entire. fourth hairs. and. fine hairs. 3/4 of. and. its. its length.. and 2, (Fig. L) is. the. setae;. the. entire. outer. bare. one. margln. aplCal on. shape,. bearing three elliptical endopodite is shorter than the endopodite. outer. pleopod. in. is nearly. width. narrow. oval. a. narrow. exopodite. margin. seta. at. leaf-like is and. very one.

(7) Two. bare. the. at. seta. New. distal. the. Institute,. basaltic. 1962,. sandy. The. Remarks.. wider. may. be. some. cephalic The. and. has. larger. that. of. a. 7. leaf-like. narrow. shape. by. and. have. by. that. one. stout. is derived. the. USNEL. box. the. Menzies,. intersex, lobe. rostral. aplCal. from. depth. female. a. lateral. the. 139o28.2′E,. I. magnifrons. to. allied deep,. paratype,. Hankuho-Maru,. by. collected. closely 4,588m. magnifrons. rotundifrons. 3.2. is much the. of. projections splne.. the fact that. the. new. species. lobe.. rostral. rounded. bottom;. laterally;. 1♀ juvenile. 34o52.1′N,. Tokyo);. muddy 1980.. dilated. and. leg. 2, R/V. (KH18011,. of. segments. peraeon name. speciBc. the. 1896. 2.5 mm;. about. distinguished. easely. than. length. species is very South Atlantic,. new. longer. gray March. the. but. and. is. Sta. S1111. and. from. described long,. mm. (Fig. 2, M). University. 12.50-14.15hリ7. time. core;. holotype;. the. as. Research. 1,678m,. pleopod. holotype;. 1? juvenile. long. Bonnier,. (Fig. 2, ∫; up.) is very short uropod longer is one. than the proximal. segment. as. of Janirella. armatures.. Materials. about Ocean. The丘fth. apex.. any without The uniramous. and. Isopods. DeepISea. References BIRSTEIN,. Y.Aリ1963a. Zool.. Zh., Y.A.,. BIRSTEIN,. 814-833,. 1963b.. BIRSTEIN,. Y.A.,. Additions. to. Trench:. le Golfe. dans. de. CIIARDY,. Deux. au. P.,. CHARDY,. 1975. Bull.. Nord. HANSEN,. Isopodes Mus.. R.R.. HESSLER, MENZIES, MENZIES, their. 1974. Paci丘c.. MENZIES,. nutrition.. search. Ser.,. RICIIARDSON, coast. RICHARDSON,. H.,. :. Novitリ(1798). of. H.,. Dan.. Comp.. isopods. Some. Les. Bull.. Mus.. 1915. Oceanorg.. "Caudan''. Nord.. Crus-. 4. en. Atlantique. 13丘gs. 16 pls.. :ト262,. from. analysis. replicate. box. 185-209.. isopods. from. on. their. observations. on. observations. with. Caribbean. the. Collリ(63). depths. abyssal. Biogas. Expedリ3(5). 12:. appartenant. 16丘gs.. Harvard. Zool.. of. Res,,. Nord 4figs.. with :. 1-10.. Atlantic. Ocean･. Aselloidea. from. in the. Vema. Re-. 72丘gs. new. America.. 1911.. 1-16,. :. lsopoda. batbyal. 79-206,. 1908.. North. nouvelles. K., STEPHENSEN, Rep.. 1. 30. 28-40.. pls.. 689-708,. :. Ingolf. Atlantic. tropical. abyssal. The. R.Jリ1962.. du. l'Atlantique. et. community. Deep-Sea. New New. the. of 162-238,. 92:. campagne. 172-178,. :. BiaEreS. 3. Dan, Abyssal. Mus.. Breviora,. Okean.. l'Atlantique. 26(2). (Zool.), (213). Malacostraca,. North. R.Jリ1956b.. de. de. campagnes. Paris. nat.. JuMARS,. Amer.. Inst.. abyssal. abyssaux. des. P.A.. R.∫. 1956a.. biology.. Trud.. Crustaceana,. central. and. in the. cores. Nauk. summary). (CrtlStaCea, Isopoda). isopods. isopode. n.,. 1896.. Hist.. natn.. Akad.. A-L.. nouveaux. Crustacea. H.Jリ1916.. Univ.. sp.. isopodes. Bonnier,. Pacific. English. with. de la scienti丘ques 26: Lyon, 527-689,. R6sultats Ann.. nouveaux. Janirella. genre. Trench.. summary)･. Janirella priseri (Suppl.) 3: ll-18,丘gs.. Pリ1974.. (In. of II. Asellota-2.. Part. Gascogne.. Russian,. Fauna. the. Pリ1972. taceana,. BougalnVill. the. of. North･Western. the. of. 2 pls,. (In Russian, with English Edriophthalmes. Jリ1896.. BoNNIER, CHARDY,. isopods. 92figs.,. 1971.. zone. ultra-abyssal. (In Russian).. Deep･sea. Kurile_Kamcbatka 丘gs.. the. 9丘gs.. Moscow.ト214,. USSR. from. Isopods. 42:. isopods. Proc.. Mus.,. natn.. du isopodes crustac昌s Hist. Paris, natn. nat.. Isopoda, Exped.. 35:. 2. (Dl). :. 71-86,. Travailleur. the. Atlantic. 21丘gs. et. du. Talisman･. formes. (了) 518-534. :. Cumacea,. Tanaidacea, Medit”. family. Super. of the. U.S.. i-53.. Ampbipoda. (Excl･ Hyperiidea)･.

(8) S.. 8. WoLFF,. T.,. 1962. Rep.,. Galathea. The. systematics and 6:ト315, 180丘gs.,. CAM(ラ. biology. of batbyal. and. lsopoda. abyssal. Asellota･. 19 pis.. 相模湾の深海産Janirella属(甲殻綱,等脚目,ミズムシ亜目) の2新種について蒲摘. 生. 重. 男. 要. 1980年の初めに,白鳳丸(東京大学海洋研究所)によって行われた伊豆･小笠原海溝及び附近海折に,大型採泥器ボックス･コアラ一によって伊豆大島東北沖の. Sta.. S-ト1. (淡水･海水産, 35属余)に属するJanirella属(大西洋,太平洋の深海産, れていた.これら2種は何れも学界未知の種類と考えられる. 2.5mm)ほ,. I.. macrura. Birstein,. 1963. 2)の. (34o52.1′N,139o. 28.2′E),水深1,678mの所から採集された底質中より得られた小形甲殻類のなかに, I, bicornis. leg.. KH-80-1,. 域の生物学,地学及び海洋学に関する研究航海(1980年2月21日-3月10日;. Janiridae科. 28種)の2種が含ま sp.. nov.. (幼雌,体長約. (雌, ll.5mm;北千島の東方沖,水深7,210-7,230m). ･に一見似ているが,本新種の額角先端には1対の大きな疎を有することなどで容易に区別され, 1962 3.2mm; (幼雌, 2.2mm)は, (噸(問性), sp. nov. J. magnifrons Menzies, rotundifrons 南大西洋, 4,588m)に類似を示しているが,本新種では街角がmagnifronsのものよりも大きく, 半楕円状を呈し,前方に突出しており,額角上に小額粒を有するなどの点に相違がみられるo. ∫..

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