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(1)Sci.. Repts.. Yokohama. Nail.. Univ.,. Platysympus. II, No.. See.. 27, p.. 1-6,. from. Crustacea). 1980. (Cumacea,. nov.. sp.. muranoi. November,. Japan. by. ノヽ. Sigeo. R丘suM丘.. ici. la. de. Une. Elle. carapace. Sagami. for. recorded with. the. from. off East. Tokyo. et. du. Platysympus. Japon,. du. muranoi,. ヽ. les autres. toutes. la longueur. connues. especes. la. par. d6crite. est. forme. caract6ristique. l'uropode.. de. p占doncule. Japanese. second. the. female. subadult. specimen. was. heavily. was. The. injured.. the. by. taken. 260-335m. for. available. was which Umitaka-Maru. R/V. was. bolotype. collected. bottom-net. 1979.. Unfortunately,. however, in. is preserved. specimen. the. of. the. in August. study.. deals. paper. present. nov.,. by. specimen depths. at. The. sp.. muranoi Peninsula. The. sea一色oor. Ocean.. P.. B6s6. Fisheries.. Of. Paci丘c. the. species,. of Nojima-saki,. 1969) from. (OMORI,. till)e from. the丘rst. Universlty. A. Cumac6s. de. esp占ce de. 1975, from described PlatysymPus author previously japonicus GAM6, Bay. In the has been Platysympus (Lampropidae), this species genus. The. the. nouvelle. distingue. se. GAMO*. the. is accomplished. After the that, in future, collection untill the study be for National Science transfered to the permanent vill preservation. autbor's specimen Museum,. Tokyo.. Tbe. to. author wishes Tokyo University. of the identi丘cation.. his hearty. express. of Fisheries. who. kindly. Platysympus. muranoi. Dr.. to. thanks sent. bin. Masaaki the. MuRANO･ for. specimen. nov.. sp.. (Figs.1,2) Description. 5mm. Holotype. (exclusive. 免attened,. portion,. humped. camel's a. length the *. so. that. back.. of the. Department. Hodogaya･ku,. without. (Fig.. carapace. the. sides. of. the. carapace. carina which from the above,. projecting Seen is greatly. of Biology, Yokohama,. 1 A,. length. oosteglteS, large,. B) is. and. Faculty 240,. of. broadly Education,. JAPAN. are. extends carapace. concaved Yokobama. lamellarly. the. a. expanded. is almost. National. postero-. like. throughout. inward. about. dorso-γentrally. large on a swelling provided with lateral aspect appears of the carapace. and. carapace. margln. The. :. The. horizontally. posterior. wadai,. telson). dorsally. arched. median. form. of. female. subadult. the oval. two-. and. whole. in shape;. in the middle, University,. and Toki･.

(2) S. GAM6. ■､---. 百. /.I/. 8. ･イ. rl. Fig.. Platysympus. 1.. (length,. oostegites anterior view. p5. second. postero-lateral. far. backward is only. ･pseudorostral meet. in front. second. as. of the. ocular. lobe is very. length. of the. pl:. portion of. without. lateral. mp2,. arst. ち:. view.. body,. of. uropods.. socket. backward. produced. both. on. prominent, ocular lobe for. carapace; small,. their. tlp, as. about. is nearly. free. third. are. carapace. anterior telson and. with. maxillipeds･. of the. marked. of the. length. are. end. well lobes. C:. view.. A:. telson). of. female,. subadult. ventral. basal. mpヨ:. p2,. peraeopod･. peraeopods.. wlngS. the. exclusive. dorsal third. holotype. nov.,. segment. and. and丘fth. the. rcarina. about. of body,. of. sp.. 5mm,. portion D: last abdominal. segment :. muranoi. D. as. a. thoracic. the. posterior. projected. ;. about. 1/10. above,. is broady. Seen. long. as. wide. 1/2 of the. and. body. without length. swellings･. as. from. aS. dorso-median. long. as. as. reaches. forward. distance. a. which The. segment.. and. anterior horizontally. lobe. round. the. The lobes. the whole The. truncated･. discernible. (exclusive. eyes･. of. The. telson).

(3) A. and. slightly. carapace,. is. which. the. 1ateral. end. as. length･. wings. long. as. the. about. wide. The. Brst. Japan. the. as. middle. つ. greatest. portion. width. the. of. total. The. first segment of the. free. the. about. 1/4. the. the. while anterior. and. posterior. The. margln.. second. is 1/3. A-C). the. thoracic. segments;. as. as. wide. is strongly. portion. 1,. is saddle-like. narroved. is. segment. ). う. a. the. and. ノ+. ).メ. ､_. -_/. J. ∼. ). -/J J.ノ. l. ノI. I. I. り′. ∼､㌔. ㌔. B 1. A ヽ′＼. ′′ヽ. ′′＼ヽ【. ､＼. 班. 下＼-＼へ. G. ＼-さこ. ′ ＼. .. ノ. ､七. 〔 F. E. 日日 ⊂). Ⅰ. C. l-1. ＼. rn. D Platysympus. B:antenna. mule. G: maxilla. H:丘rst. muranoi. C:1abium. maxilliped.. sp.. nov.,. bolotype. D:1abrum. Ⅰ: basis. of. female. subadult F: E:mandibles.. second. maxilliped.. long. postero-. and about little shorter. ノ. 1. as. greatest. ､ノ′ノノノ,. 2.. the. shaped and its anterior. J. Fig.. of. carapace. lie between. segments. length. carapace.. as. (Fig.. segments. three. expandedlaterally. carapace, as. the. Of long. as. is abruptly. of the. across. seen. times. from. as. carapace. 1/3. about. 1/4. Crustacea. as its depth. wide total length of the free thoracic. ･about The ･as. Cumacean. 1 and. than. more. 2 times. New. A:. anten.. maxillule.A. width. 1/2 and.

(4) 生. S. GAM6. than the first, and wider The third to丘ftb segments last. of the The. four. length.. third. segemtns. slightly. are. shorter. long. as. Tbe丘rst. than. is. of the. The. lateral. plates. The丘ftb. is. segment. and. about. little less. than. abdomen,. longer. long. as. The. thick.. and. little. a. size,. 3/7. about. and. short. rather. in. fourth.. reduced. in shape. cylindrical. subequal. the. length. the. as. in size.. dorsum,. the. on. crest. median. developed.. well. segment. about. small. successively. are. is slender,. a. with. are. segments. abdomeh. body. provided. second. than. long. as. and. nrst. the. longest,. the. 2 times. the. as. and. 1/4. about. short. the. as. segment.. sixth. The. (Fig.. telson. abdominal. segment. borders. 1,. serrated. tubercules. is the. third. 2 times. about are. aest血etascs.. The. composed. 2. of. length;. The. mandibles. is. brancbial. has. Ⅰ),and. about. are. the. second.. is. bears. distal end. segments. The. very. 3/4. as. long. the. as. basal. ; the. and. minute. is. 月.agellum. main. Of 3 segments. is. The. combined.. two. provided with lash and. main. 2, B. of the. normal. 13. are. on. setae. left.. the. G). F,. There. genus.. on. mobilis. (Fig. 2,. maxilla. are. type. normal. the. of. genus.. palp.. is shown. third. in Fig.. very. No. 2, H.. lobules. branchial. are. the. on. 1/3. as. long. peduncle. 2. merus. and lateral as. the. of the. and. as. long. are. short.. 1. (Fig. 1, C. and. detached.. are. the. as. aplCal. on. The. is about. The. 1/2. 丘ftb long. second,. and. uroped. (Fig. 1, D) is about. 2. as. as. remaining. The. distal. remalnlng. as. The. length.. ln. carpus. setae.. about. side.. either. diminishing. successively. is about. incomplete. are. of maxillipeds. (Fig. 1, C) is missing slender,. iscbium beras. and. pairs. distal portions. the. peraeopod. the. The. 1. laminar minute 且rst peduncular. and Tbe. borders. two. one. in Fig.. 1 lacinia. and. no. and. are. second. podus. segments. consistlng. 且agellum. shown. peraeopod. peraeopods. gether;. ; the. surface. is. there. portion;. segments.. as. maxilliped. The丘rst. the. dorsal. as. distal. (Fig. 2, E). second. 2,. proximal. lateral. ; the. peduncle. last. the. as. part.. Tbe Fig.. as. the. subequal. antenna. the. long. as. uropodal. distal. the long. peduncle,. accessory. Tbe. maxillule Tbe丘rst. the. as. ll setae right, and The and maxillule. The. than. 2 times. long. in. subequal. the. less. longest,. as. times. two. is about. segment. the. in of the. middle. 2. are long. of which 2, has 3 (Fig. A) peduncular lateral on distal and the. antennule. segment. than. convex. and. in the. tubercle nod-like 3 splneS, the outermost. small. spiniform. a. little longer. a. and. are血ely. Tbe. is. D). basis. long. as. times. as. the is. peraeopod the. of to-. segments. pro-. short,. fourth. long. as. thelast. The is as the inner margln. segment exopod abdominal and 1 distal spine on as The long as the endopod the peduncle. consists of exopod and 3/4 as long long as distal 2 segments; is as the the proximal segment 1/3 very short, about one,. is. a. has 3 aplCal which little less than the. splneS･. second. The and. endopod third. has. together;. 3 segments; the. secor)d. itsむstsegment is. a. little longer.

(5) A. than. the. the. third;. diatal. the. -margln;. Material･ University 140oO7.. The. known. followlng. 1) As. 1/4. seen. 4′E, depths. endopod. as. l負ne. and. at. apex･ Tokyo. Peninsula,. B6s6 m,. seta. inner. each the. Umitaka-Maru,. (R/V. 260-335. On. splne. 34Q57. 5′N,. by. collected. 8ottom-net,. distinguished. sharply. from. any of the P･ typicus (G. 0. SARS, 1870), P. brachyurus (ZIMMER, HANSEN, 1920, P. japonicus GAM6, 1975, P. phylloides DAY,. DAY,. 1978, P･. slightly. shorter. which. the. as. is Brst. furnished. free. greatest. thoracic. ellipsoidal from. tⅥⅦ. with the. as. a. seen. the. than. long. as. As. 2). portion.. and. is. carapace. swellings. the on. peduncle.. 1978,. is. which. carapace. 4) The. by. nar-. is. the dorsum.. very. 3) The has. uropod long. 3/4 and about is saddle-like shaped as. exopod. of the. DAY,. in shape. side,. uropodal. segment. width. 1978, B. camelus. DAY,. compressus. the. dorsally. 5) The wide. is. species. posterior. vaulted is only. peduncle･. new. Characters. from above,. in the. rower. the. splneS. Nojima-saki,. of. 5. 1 distal. (holotype), Sta. UM-79068 East. Japan. species,. P･ depressus. telson. segment. from. bear. segments. has. 2 unequal. 早 subadult. 1907), P･ tricinctus. much. Crustacea. 1979.. hitherto. the. two. proximal. 34o57. 7′N, 140oO7.. to. Remarks･. 1978,. Cumacean. Fisheries), off. of. 5′E. 7 Åug.. 1. New. the. as. and. about. carapace.. 日本産のクマ目(甲殻綱)の1新種Platysympus sp.. muranoi. 蒲. nov.について. 生. 重. 摘. 男. 要. 1979年8月に東京水産大学の海鷹丸によって,房総半島野島崎東方沖の水深260-335mの海底 OMORI,. Cumacea 1969)を用いて採集されたクマ類の標本は,東京水産大学の村野正昭博士より同雇のため筆者にあづけられた｡筆者がこれらの標本を調べ. から,ソリ･ネット(bottom-net:. た結果,それらのうちに,ランプロプス科Lampropidaeのプラティシソプス属Platysympusの. 1種と考えられるものがあった｡この属のクマ類ほ従来おもに大西洋を中心に南極海などの海域の 188-1200m 1907,. 1913;. r,.0.,. のところから3種類と1未確定種が知られていた(SARS, HANSEN,. 1920;. FACE,. Lo=AKINA,. 1951;. 1958;. JoNES,. かし,最近になり南アフリカ南端附近の大西洋と印度洋側から4種類(Day,. 日本近海からほ,相模湾【￣F田沖の430m. 1969;. 1900; REYSS,. のP･ melus. 1870). ;. phylloides DAY,. P･. brachyurus. (ZIMMER,. DAY,. P･. 1978;. 1978)が記載された｡. 1907). de♪ressus. ; P.. DAY,. tricinctus. 1978;. P･. HANSEN. compressus. typicus. (G.0.. 1920及び南アフリカ産 DAY,. 1978;. P.. 1978の何れの種類とも,背甲の形態及び本種の尾肢柄節が尾節の長さに殆んど近い. などに明らかな相違がみとめられ,種を異にするものと考えられる｡ここに村野正昭博士の名を冠し. て,新種P･muranoiとして記載するo本新種記載の基となった模式標本は,唯1匹の東成雌(体長約5mm,尾節を除く)であり,可成り破損の著しいものの,種の同定に必要な要素は充分残されていた｡. 1978),し. 深から扶育丸(東京大学海洋研究所)によって採集され. japonicusが最初のものである. た標本に基づき,筆者によって1975年に記載されたP. 今軌新たに房総沖から得られた標本ほ,上述の相模湾産の種,大西洋産のP. SARS,. ZIMMER,. cap.

(6) 6. S. CAM(ラ. 本新種の主要な特徴ほ次の様である｡る｡. 1)背面よりみると,背甲ほ後方に狭まり,卵型をしてい. 2)背甲を側面よりみると,背甲腹面は平坦であるが,背甲背面は背方に隆起しており,特に. 中央部で高い山型をしている.更にその後方の後縁中央近くに,もう--つの高いLl+型隆起をそなえ, 3)背甲の両側縁ほ平板状に強く張り出し,就い隆起線を 4)第1自在胸節は乾状をしており,その前縁は幅広く,最大甲帽. 一見,双隆配の背に似た態じを与えるo. 背甲全長に渡り形成している｡. 5)尾節ほ尾肢柄節の長さよりも僅かの約1/4を示しているが,後縁は著しく幅狭くなっている｡ 6)尾肢の内肢と外肢の長さは互いに等しく,それぞれ尾肢柄節に短かく,末端に3棟を有する｡の長さの約3/4を有する｡. Ref DAY,. J. 1978. Ann.. FACE,. South. L.. MlユSリ了6. Les. 1951.. Cumacea.. african. S. Afr.. 16丘gs,. Faune. Cumac占s.. 3 Family. Part. 137-189,. :. erences. de. Lampropidae. Ceratocumidae.. and. 1 table.. France.. 54:. 109figs.. 1-136,. Lechevalier,. Paul. Paris. CAM(A),. Platysympus. S. 1975. Bay.. Publ.. HANSEN,. H.∫. 1920. N.S.. 1969.. 2000. N.B.. Sci. Publ. M. D.. et. Cumacea. A. bottom･net. Soc.. Japan.. 1978.. new. Crustacea. cumacean. from. Sagami. 2丘gs.. ⅠⅤ. Danish. lngolf.. &. the. 25. collect. 29ト293,. :. Seas. 4. 3 :ト86,. Expedリ. 1900.. the. living. of. STEBBING,. T.R.R.. 1913.. Cumacea. Neue. Cumaceen. Acad.. the. J.. sea･floor.. Norway,. with. (Sympoda).. Famille. -. de. Lampropidae.. Psendodiastylis,. Dasylamprops. 7丘gs.. short. of 3 (3 & 2) : 25-40, pls. 17-32. Bergen. species｡ The Ann. S. Air. STEBBING, T.R.R. 1912. Sympoda. account. to. close. tropical. Platyospidae,. (concluded),. Crustacea. USSR. 1丘g.. 35､: 71-84,. Crustaceana, Lampropidae. 201丘gs.. exceeding. (In Russian).. zooplankton. de profondeur de l'Atlantique Platysym♪us, Lamprops, Platyphlops,. Murilamprops.. depths. from. U.S.S.Rリト310,. of. Leningrad.. to. Cumacea. of 99一-180, 34=五gs.. :. Cumac占s. genres. G.0.. 10 of. Moscow. House,. 1969.. I Les SARS,. a. 229-235,. distribution. and. systematics Galathea Rep.,. 1958.. Oceanogr. REYSS,. :. Malacostraca.. The. meters.. LoMAIくINA, OMORI,. Biol.. Crustacea. nov.,. sp.. 22. Lab.,. Copenhagen.. pls.. JoNES,. japonicus. Mar.. Seto. Das. Leuconidae descrlptlOnS. Mus.,. 10. Tierreich.. in:. Cumacea. of. and丘gures 129-176,. :. 39. :. 16. An all the. pls.. i･Ⅹvi,ト120,. 137丘gs.,. Berlin.. ZIMMER,. C. tion. ZIMMER,. 1907.. aus. der. piden. Zool. C. 1913. Stldp.. Expワ. der. Familien Anz.,. Die. 31. der. Deutschen und Vauntbo皿pSOniiden,. Schwedischen. S･Lidpolarexpedi-. Nannastaciden. und. Lampro-. 367-374.. :. Cumaceen. 14, Zool.. Yon. Cumiden,. 6. der Deutschen :. 437-491,. pis.. S臼_dopolar-Expedition. 40-46,. 2 text. figs.,. Berlin.. 190l-1903.. Deutsch..

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