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(1)Ac血血14:. 1_26. Bulletl'n of the ManazuTU Faculty of Educatl'on and. Man'ne. Laboratot'y. foz'Scl'ence. Human. Scl'ences,. Yokohama. PARTIAL. OF. REVISION. OF. Unl'veISlty. JAPANESE. (CHAETOPTERIDAE, DESCRIPTION. Educatllon, Natl'onal. (コ誌4月TOPTERtLS. POLYCIiAETA). THREE. PACIFIC. SPECIES. NEW OF. SIDE. INCLUDING. ,. FROM. CENTRAL. SOUTHERN. JAPAN. Eijiroh Nishi The. Abstract.. (Renier) have. taxonomy. had. been. recently. U-shaped. a. and. (<. small was. 2. body. cm. the. length) Izu. tip,. absence. of. ofchaetigers. in region-A. morphology. modified. with. chaetae,. Pacific. university,. :. water. of of. brilliant,. (Renier). politan. species,. Fauvel. 1953,. (1984a,. valid species. Blake. mpson. &. been. her. 1996, schaffner. C,. and. it might. or. of. absence shape･. for Science 259-0202,. Japan区∃. a. Petersen. 1969).. 2000).. cirri. body. cm. prostomium,. dorsal. habitats･. reglOn-C. Lastly. color. by. Japanese. the. notopodia. and. orlglnally. higher number compared. are. species. morphology. neuropodium,. those. wing-like. 1911,. Japanese. number are. species. SP･. is characterized. Peninsula,. is characterized Ten. n･. narrow. (-region-C). region Boso. length).. and. on. ,. many C. 1996,. Nishi 1997, &. Faculty. of of. also. A4. teeth. of. compared. of Education. Tho-. Britayev. Human. and. Sciences,. National. Yokohama. enishi@ynu. ac.jp･. In. Recently. with. synonymized. petersen. 30. had. Japan. the genus. (e. g.. that. confirmed. & Britayev. (>. a. takahashli'Izuka,. valid species,and. (1997). cosmo-. the world. ,. a. vanop-. to be. (e.g.. of. Education,. studies of the Chaetopteridae. findings. Chaetoptems. chaetae･ be. Katsuura,. at. collected. posterior. It is. Peninsula･ l'zuensl's. ,. confused.. Chaetoptems. over. sp･. Boso. and. (-region-A). region. peristomium･. from. It is oculate. Japan･. Chaetoptems. eyes･. the genus. of. is described. SP･. Tateyama,. small. straight. peristomium. and. intertidal to deep-. Hartman. exactly. large body shape. tube. be. considered. 1997). and recent. supported. 2002,. b,. have. vanopedatus,. B. shield,. to. long. a. ,. a. eyes,. n･. in thean.terior. ringed. van'opedatus. 6 species. now,. Central. Bay,. C･. although. pBCi(1'cus. of chaetigers. characteristic of. to. Up. Peninsula･. off Tokyo. absence. modified. is considered. of eyes,and. Kanagawa. all. 1967,. Sea,. the. has. Cnaetopten)s A4. yellow. presence. 1uminescent,. common. Day. faint. Laboratory. had been. region tube･. glandular. polychaete,. and. (-region-B). notopodia,. Manazuru,. 61,. tube,. the middle. Inland. which. from. by. and. reglOnS. (ll-12). COllected. Was. sp･. confusing. Cnaetoptems. the Boso. to. It is characterized. absence. ventral. ManazuruMarine. edatus. have. the. shape. chaetopterid. petersen. (12), the. places. Iwa. Alarge,. size. Peninsula. is partly. bottoms.. sandy. added･. higher number. U-shaped. a. and. are. species. the Izu. n.. sand-formed. the Seto. from. congenerswith. Eijiroh Nishi. of. epibiotic small. of. in various. uncini. an. eyes,. described. the. chaetiger. new. a. inhabits. Peniansula.. and. collectedand. by. from. JaPOnl'cus. and. ,. from. aknob-like. three. bottoms. sandy. ChaetopteluS. of the丘rst. notopodium. Here,. in mud. common. and. extendedflipllikeperistomium,. tube･. collected. with. an. cosmopolitan waters･. from. collected. by. characterized. by. Japanese. beenknownfrom. material. be. to. thought. (Polychaeta, Chaetopteridae). C丑aetoptcmzs. of the genus. 1861,. reintroduced. the Western. and. have. been recorded. C. capensl's Stimpson. 1855,. longlmanuS. C.. Marenzeller. 1879,. Paci丘c, :. C･. 1855,. longlPeS. 10. in. species Schmarda. macropus. Crossland. C.. of the genus.. names. older. C. 1uteus 1904,. Stimpson C･. Crossland. cautus. 1904,. C.. ). 1911,. takahashl'1'Izuka C.. Nishi,. gTegan'us. van'opedatus 1911,. Okuda. 良 Lloyd. C. Arai. kagosl-mensl's &. Sasanuma. Izuka. 1911,. 2000,. C･. (Renier) (Marenzeller. 1879,. Izuka. 1935,. 1964,. Kohn. 1973,. Ima｣1ma. Bailey-Brock. &Ha工tman. 1987).. In Australia,.

(2) 2. Eijiroh Nishi. C.. and C.. macropus. 1855,. Schmarda. been. 1864,. synonymized. Cameron. need. 1996,. have. Recently various. the. Marenzeller. new. C.. and. from. Japan,. Stimpson,. a. South. of. available various. the. scuba-diving by. underside. of. capensl's. known. species. some. History. University. cautus. by. rocks. 1),. were. coレ. and. Okuda. British. electron. materials. specimens. were. to. the. loaned. institutions ; Umiverslty :. Misaki. Marine. Of Tokyo. :. Collection,. Colombia. Bio-. OsakaCity Hokkaido. Museum. (Can-. was. material. digglng. gently. from. the from. tubes. and. or. rubbles,. there. sorted. were. removed丘･om. Worms. they. fixative. the lO%. was. They. tubes丘rst, for-. neutralized After. used.. deposition they. exam-. and. fixed.. were. if. one. of materials. in. to 70%. transferred. were. or. Figure. 1.. Map. of Japan. showing. Fixed. materials. dissected. electron. -,. were. exam-. 1ighトand. microscope. scan-. (SEM).. COllection. sites and. literature. records. of (丑a-. From Hokkaido Honshu Katsuura etoptems. north ; Hok, ; Ka, ; ; Hon, Sa, Sanbanze in the Tokyo Bay ; Ta, Tateyama, Boso Peninsula (type locality n. the Tokyo Bay ; Mi, Misaki, sp. ) ; To,. ofChaetoptTuSjaponl'cus. Miura. Peninsula. ;. Iz,. 1'zuensl'sn. sp. andC. locality ofChaetopteluS. Am,. Amakusa. Kg,. ;. gosl'mensl's); Ya, lsland.. Scale. =. sp.. );Si, Sikoku;Go,. takahashll); Ky, Kagoshima. Yakushima 200. (type locality. Izu Peninsula. n.. ning. Of Tokyo Universlty. Royal. scannlng. lon. uslng. alive to the laboratory. before. ined with. :. acetone. and. Fig.. rot-samples.. ined. ethanol.. and. Museum:. an. ,. S-800.. available. museum. Natural. C.. sent. Universlty. comparison. and. Hitacbi. a. 100%). Hitacbi. with. in. comparative. fbllowlng. Museum,. coated. in. graded. aIld. usually. The. separated. from. taken. days. C.. to free the tubes or. fixative,. author.And. Laboratory,. Cross-. author,. hand. sediment,. two. colleagues. ･. 99%,. then. and. examined. (SEM). 1 unidentifiable. longlPeS. tubes. gear.. in the sand. maldehyde. a. and. Some. and. (Nishi. sputter. loglCal. I compare. (see. with. which. As. of temperate. Chaetopteridae. possible. and. materials. places areas. were. E-1030,. minutes,. 95%,. a. materials. nco-temperate. out. Sputter. from. species,. a丘･esh. From. sorted. air-dried,. microscope. Cnaetoptemsfrom. new. series,. 90%,. in. ANDMETHODS. other. collected. cautus,. to now. (70%,. 80%,. 10 to 20. with. dehydrated丘rst. was. Africa.. Collection. by. 3. here.. and. poorly. MTERIALS. 1ected. Japanese. l describe. C.. might. gTegaIll-us,. up. each. 2000).. et al.. and found. which. confirm. from. recorded. I examined. places,. species,. been. &. Hutchings. Chaetopteridae. fb工SEM. ethanolseries. (Knox. 1979,. 6 species,. Materials. buttheybave. vaTIopedatus. & Rainer. Japan,. 'Nishi. 2002,. land. 1914). takahash1'1', kagosl'mensl's,. vaI･Iopedatus,. to. In. (Stimpson. recorded. ; the Australian. revision.. longlPeS,. C.. Hutchings. 1984). a. were. Augener. with. 1971,. & Murray. 1uteus. Km.. Bay Island. Kyushu. Ariake Inland Sea ; ; Ar, locality of ChaetopteIW kaOkinawa Sesoko Island ; Se,. (type ; Ok,. of (丑aetopteruspacl'fl'cus Gogoshimalsland (type.

(3) Three. :. Natural. Coastal. Museum. ada). collection. History. Museum. of Natural. and lnstitute,. History,. some. are. species). species. Cbiba. Katsuura,. in Fig.. noted. or. 3. Cむaetopterus. SYSTEMATICS. :. Family. Chiba.. (includingtype. sites and related places. cality of. new. CHAETOPTERIDAE. Audollin&. lo-. Genus. 1.. Milme. Chaetoptems. Chaetopterus Descri. tion of. For observation. of A4. modified. used. for detailed observation.. fied. of A4. chaetae. specimens, control. shaft 5. each. successive. 70. to. gressively. %. ted. on. a. with. on. fresh. water,. made. from. with. aid of. A,. the. with. into. 4. C. on. (C.. and. colonial, parchment,. classification The kept. type. tory have. Katsuura,. ,. also. Natural. C.. of. in which. tube. species,. parchment. of tube. been. History. 12. to. aratlng gland. creamy. 4). n.. sp. to. Inner. and. and Coastal. Museum. (OMNH).. (CMNH), at. of teeth.. mud. and. of tube The. fわr the. Osaka. materials and. area,. 5. with. Tube. chaetigers' without. 15 to 30 chaetlgerS,. with. many. ventral. all bilamous. and bilobed. with. with. line sep-. neuropodium,. uncinl. U-shaped,. larger. providing. in sandy. embedded. bran-. openlng丘equently. ZW-323, oflzu. are. Type. examined. complete,. Peninsula,. ‥. 10. rubbles,. 15. -. 1 Nov･. gear,. data. ZW-363,. samelocalitytoholotype,. Other. (4. worms. 10. m. gear,. May18,. ooo1-0006,. uslng. SCuba. 1998,. -. E.. 25. deep,. m. leg.. gear,. hand. obser-. 1995.. 564,. 565. Peninsula, uslng. SCuba. Nishi;CMNH-ZW,. sandy. M.. tube),. for SEM. Miura. by. hand. Nishi,. 15 Dec.. (withouttube). 1054 20. leg.. E･. 563,. bottoms,. sandy. by. CBM-ZW-362,. :. Misaki,. tubes),. with deep,. holotype. sandy. with. CBM-ZW-562,. material.. deep,. worm. vations),. as. Japan,. 1eg･. dissected. parapodia same. m. 1996,. (one. CBM-ZW-325. (some. complete. Northernside. Paci丘c side ofCentral. with. SCuba. Futo,. withtube,. CBM-. Holotype,. :. material. Tateyama,. Boso. bottom,. by hand. Aizawa.. lnstitute,. ofNatural. His-. afewspecimens City. B. neuropodia. fわr apertures,. except. ; reglOn-A. ched.. 3B),. important. comparative Museum. deposited. number. Peninsula,. History. Chiba. lobe large,. of A4. transverse. glandular. r9glOn. notopodium. ventral. paratype. on. ) (Fig. 3A).. be. extended. tube. builtfrom. Side. ;. size, in inner. chaetae. a row. white. ventral. yellow. medium. brown. Bl and B2;reglOn-C. uslⅢg. sp.. thin tube,. lining. and. and. in. with. fused notopodia,. mudbottom. irregularU-shaped. fragile tube. chaetigers,. Chaetigers. sep-. appeared. japonl'cusn.. E), 2). layer. re-. (1994). al.. (C. longlj)es: Fig.. material. ,. in number. Material. apparatus.. of the species.. (CBM). chiba. 8-12. Of. deposited. made. branched. the Natural. at. The. in each. the surface. 2A,. were. et. 1)リーshaped. is considered. tube. Bhaud. different. tubes. and. and parapodia. (1904).. (cnaetoptez･us l'zuensl's of. rinsed with. Drawlng. regions. of. glass, chaetae. Wild. cautus,. mucous. with. club shaped,. unilobed. mounts. specimens. follows. types ;. takahashll:Fig.. a cover. and. was. sands. modified. with. parapodia. Of trunks,. Crossland. c.. type. moun-. ; some. used. -preserved. and. inhabit. small. sands. by. for body. softbottoms. 3). were. Olympus. a. tentative. uncini,. slides. alcohol. B,. worm. arating. air dried,. in color. with. sp.. 416. 2A-C,. prostomium,. ll. n.. Cnaetoptel･uS. brown. minute. with. drawlngS. partly by. and. they. side sticky tape and shadowed. pushed. Terminology gions. pro-. observation. methanol,. of. glass. dissected,. were. in three. palladium.. observation. uncini. %. a. with. transferred. and. eyes. fixed. KOH. washed. Before. ethanol.. double. grid with. gold. For. ; then. minutes. to 100. transferred. were. 10. by. of distilled water. baths. out. offlesh. modi-. from. Oculate. Diagnosis･. was. specialized. dissected. relieved. to. The. were. SEM. chaetae,. 1827. Cuvier,. pECl'h'cus. Figs.. s. 1833. Edwards,. Museum. of. Description.. Body. length. 100. about. paratypes,. length. CMNH-ZW-0001). in. mm. largest. one. ,. 50 to 120 holotype,. 丘･om. slender. mm. 60. Tateyama,. and fragile,. (total. long -80. 120 body. in. mm mm. width.

(4) 4. Eijiroh Nishi. Figure. 2･. Tubes. left), arrow Tateyama,. and. worms. shows Boso. of Japanese opening. Peninsula.. of. (加etopteI.uS. tube.. D,. C.. A-C,. C.. japonl'cusn. japonl'cus with associated. sp. crab.. A,. U-shaped E,. C.. tube. cautus,. and. a. UIShaped. (upper. worm. tube. from.

(5) Three. Figure. 3.. Tubes. on. 5. -. 12. B,. D,. mm,. tube. about. 3. in. +5B+20C Anterior. width. worms. 100. to. up. (ll-12A+. 5B. +. sp.. from. in holotype,. mm. long,. mm. 10-20C. with. ; N=5. and posterior region. clear white posterior. color ; uncinal. up. ; llA. reglOnS. Creamy. brown. greenish. on. especially. ; posterior. ventral or. orange. brown. White,. Katsuura,. Boso. the. on. pushed. in middle. and. groove, border re-. ReglOn-A. long and. llarrOW,. With. (ll in. holotype,. 12 in paratype. (Fig.. 4A,. peristomiumflipllike,. side,. horse-shoe. completely. B).. dorsal. shaped side.. ll. ZW-324. (Fig. 5AIC) A. palr. 12 segments. or. and. ZW-325). enrollventral ,. notcovering. Of minute. eye-spots. side. view. feacal. slightly brown. of prostomium. show. prostomium,. and. short. peristomium. inside. posterior. and. Two. groove.. at Junction. cm.. plgmeIlted. exceeding. line. 1. side peristomium. side of prostomium. continued. B),. scale. the. tube. sand-covered. ,. dorsal. from. tube. sand-covered sp.. of. lVhen. arising dorsally. the. bottom. of. of lateroposterior limit of peristo-. mlum.. Middorsal. glOnS.. inner. tentacles 5A,. fragile,. (CBM-ZW-378).. Dorsal. away.. (Fig.. posterior. lateral. ,. Cnaetopterus. Peninsula. brown,. reglOn. SP.. C,. visible in dorsal. grooved. yellow-orange. n,. Okinawa.. dorsal. neuropodia,. 5. l'zuensl's,. tube from. with. neuropodia. row. (丑aetopteI-uS. or. A,亡加etopteI-uS. sand-covered. (丑aetopterus. -8. species. holotype).. side of middle. female. branched,. shell.. fixed. ChaetopteTuS.. longlPeS,. ofgastropod. chaetigers. of male. C.. mouth. complete to 40. of Japanese. worms. and. lzu Peninsula.. new. of pigmented. 5A). mouth. and continuing. Ventral. beginnlng. ciliated groove. surface. of. bases. (Fig.. part level of first chaetiger posteriorly reglOn-A. (ventral glands) (Fig. 5B), lateral straight white. between. line. throughout with. slender. clearly. (6-7 mm. region-A. plastron. separated. width). by. of dorsal.

(6) Eijiroh Nishi. 6. chaetigers,. upper. (Fig.. opodium a. 12. Modi丘ed. 6A). 3 small type. chaetae. modi丘ed. A5. -ZW-362.. slender, and. F,. 2.4,. A2. 2.4,. A9. to. A12. 2.6,. in CBM-. 2.4,. 3.2,. llth. 2.7,. 3.0. in. 2.4, in. (N=5).. (Fig.. etigers notopodia reaching. Bl and 4A,. B).. (Figs.. 4A,. opposite. both. rami. subdivided. side. fused. and. and. plate) ,. with. bearingapairofuniramous. 5A). in. triangular. palp＼s base,. B2. ; B3. B5. to. circular. fully encircling 4A,. dorsal. lower. deposited. each. teeth toward. bes.. Uncini. and. lobe, in lobe. B2 B2. cirri.. Uncini. (uncinal. lower. with. oriented. lower. to elliptlCal, with. same. ones. number than. opposite. Tube. mm. openlngS. and. F). ventral. dorsal. cirri. of lateral lobe. between. lateral and. simple,. terminal,. dorsal. or. (Fig･ 2A). substratum,. rlngS. tubes.. Tube. and. openlngS,. (10. greater part Tube. not. branches,. some. among. (4 among. 20. 20. tubes),. tubes). layer. layer brown. and. main. ,. in most. connected. in central part,. wider. inner. slight. both opening. ,. with. with. branches. wall thin,. with. of the substratum.. branches. and associated. with. by pygidial. surrounded. the surface. branch. smooth,. long. length. pygidium. rarely with three branches. outer. with. Distance. parchment. two. oriented. slightly larger thanventral. similar. in the sandy. with. anteriorly oriented. similar to those ofreglOn-B,. anus. 1.4. subdivided. size of lateral lobe. (Table 1).. Without. knob-. length. 5E),. ; neuropodia. lobe. same. shape. U-shaped,. B,. posteriorly. as. width).. notch,. 4A,. one. Lateral. unilobed,. digitifbrm,. lobe rounded,. ;lateral. about. 10 to 20 chaetigers. tapered. semトtransparent tough. and. (Fig. 2A).. of lobe. counterpart, and. teeth. in both. ; neuropodia. central line of upper. bluntly D-shaped. ventral. Notopodiawithout. B).. Bl. Uncini. lobe. usually. of both. and. biramous. without. a. (including. large-flip. than. ; notopodia. ZW-325. each. of the tube below. shape,. notopodia. lobes with uncini. and. ventral. vertically. bearlng. Neuropodiafleshy. upper. 1. glan-. Bbiramous,. parapodiaofregion. (Figs.. extending. uncini.. Bl. :. 5E,. (about. lobes.. Cba-. B. in Fig.. in all. fbllowlng. Number. showing. cbaetae,. (Figs.. in paratype. (Fig. 5F). dorsal. elongate,. longer than. formed. neuropodium). chaetigers. B2. side. (Fig. 4A).. cupule. 5 chaetigers. acicular. (Fig. 5F).. (dc ;. mm. size ofuncini. B5. to. in reglOn-B. smaller. all biramous. lateral lobe,. upper. 6-8 with. with. in reglOn. as. one. pos-. at. extending. lobe. at base. longest. 2.2,. 2.6,. its. increase. gradually. being. (region-B). region. examined. only.. and. length,. similar. 2.5,. dular dorsally,. BI. length. length. each 2.4,. Middle. side,. (All. A12. parapodia. to 3･2 mm. (Fig.. swelling. lobe. nearly. (region-C) with. 1ike intipsdistally. Shorter. serrated. and. (Table 1).. (N=4).. (Fig.. leaf-like,. reglOn-B,. B3-. in B3. (30 to 50).. rami,. upper. uncini,. lobe. in ventral. smaller. posterior region. CBM-ZW-325.. paratype. worms. weakly. smallfluid-filled. Notopodial. teriorly, to. edges. side of notopodia. zw-325).. Al. one. fわlded. Dorsal. lobe of ventral. and. 15-20. with. uncini.. between. trend.. lanceolate. becomlng. -. in number. and. C and. and. less in number. and uncini. in A9. row. slllgle. 100. over. with. region-C. longest and most. gradually. B2. of dorsal. in para-. chaetae. chaetae. chaetae. smooth,. G).. dorsal. on. ones. 1anceolate. fully. surface 6E,. lanceolate. ventralmost. wider,. bordered. Bl. of teeth of unicini. and. chaetigers;. a. lower. small. (Fig.. side of A3 with. B. B5. smaller. A3. reglOnS. lobes.. in size. varied. of teeth between. of. club-. teeth,. of minute. and. chaetae. asymmetrical. 10 extended. ; dorsalmost. 6E-F). with. chaetae on. provided. chaetae. and. both. on. 5. row. row. 10 to 20 slender lanceolate. rarely. slightly yellow, -. a. chaetae. ofA4. of 20 to 40. neur-. leaf-like. modified. modified. A9. -. slender. to. chaetae. Bl. provided. with. side. +. ones,. dorsoIPOSterior. chaetae. or. A4. dorsal. than ventral. A3. to. dark-brown. ,. in number,. slender. Al. bordered. (Fig. 6B-D). lower. and. 4B).. in color,. yellow. shaped -. 2C,. of 10-20. row. slngle. chaetae,. 8. peristomium. lo-. single. Reproduction.. Separate. is female.. paratype-ZW1325 almost November. all the year, and. sex,. Gametes to. July,. during. 1995. February. December,. holotype. is. male,. appeared September, to. 1998.. in.

(7) Three. Figure. 4. B,. Chaetopte'uspacl'(1'cus Ventral. (regions AIB). n.. and. sp.. ,. new. holotype.. left lateral. species. A.. mainly. (region C). 7. (加etoptcI-uS. or. dorsal. views.. (regionsA-B)and. Arrows. indicate. A4. right lateral parapodia･. Scale. (region-C) =. 5. mm･. views･.

(8) 8. EijirohNishi. Figure. 5･亡丑aetoptems. indicate B4.. E.. A4.. pacl'I)'cus. C.. Ventral. neuropodium.. Anterior view. dc.. of. dorsal. n.. view region cirrus.. sp.. holotype.. ,. of mouth, C pe,. (C2. A-B.. prostomium to. C18).. peristomium.. Dorsal and. F. pr,. (A). and. ofneuropodia. prostomium.. at bottom.. dorsal. peristomium,. Detail. (B)views. ventral. t,. C. 4 to. tentacle.. C6,. Scales,. of region D. ventral. A. and. Bl,. Ventral. view. view.. ey,. 1 mminA-E,. 0.5. arrow. of B3 eye. mm. to ne.. in F..

(9) Three. Figure. 6.. Al. -. C缶aetoptems. pacl'(1'cus. n.. A6.. Modified. chaetae. of. G.. Slender. lanceolate. B. ofC2ventralrow, G,. 60LLm.. -D.. chaetae. of region with6free. A.. sp.. ,. teeth.. ParatyPe. A4,. new. species. SEM. photos. increasing. chaetae. Scale:A,. or. ofA7. 600pm;. CnaetoptelluS. of body,. 9. chaetae. and. with. detail. magnific'ations, H.. Uncini. ofBl. B,. 120um;. C,. anterior E,. uncini. of row,. 50um;D,. A.. surface with H,. lateral. Right in. D.. EIF.. 7 free teeth. I,. 15LIm. ;F,. view. of. Slender I.. Uncini 25トIm;.

(10) 10. EijirohNishi. Table. 1.. Comparison. of uncini Data. of uncini. are. measured. taken丘.om. are. size and. and one. counted two. or. worms. Cnaetoptems Uncini. of A9. ca. Uncini. of Bl. upper of teeth. photographs Sizes are. (N=6). 8. (N=6). and. (N=5). 35-50. and. of teeth. number on. slide. glasses.. micrometer. longlPeS. )ZuenSIS. (N=8). 6. JaPOnl'cus. (N=6). 16士2.8. (N=9). 5-7. (N=9). 40-52. 28士3.0. (N=7). 12-20. 23士2.4. (N=8). 23-32. 46士8.6. (N=7). 20-25. 6.6±0.5. (N=7). 30-55. (N=8). 6-7. 6.1士0.6. 46土4. 7. 12-20. 45士3.5. (N=7). 7-8. 8.0士0. (N=6). 70-78. (N=8). 15-20. 17土3.2. (N=5). 30-45. (N=6). 40-50. 17士1.8. (N=7). 8.Oよo. (N=6). (N=6). 40土3.3. (N=6). 20-30. (N=5). 17士2.3. (N=8). 15-25. (N=9) (N=6). 45-50. (N=5). 12土1.5. 6.8土0,4. (N=5). 40-45. (N=8). (N=6). 24-32 28土3. 1. (N=5). 15-20. 22土2.9. (N=6). 6-7. 42土2.7. 18-25. (N=5). ll-15. (N=9). 5-7. (N=6). 45-60. 24土2.2. (N=6). 5.9土0.3. 52士6.8. 20-25. 25土1.8. 15-25. 6.9土0.3. (N=8). 23-27. 20土3.4. (N=10). 6-7. 7.3士0.5. (N=6). 35-45. (N=8). 7-8. 40土3.3. 19土3.2. 48土2.6. 15-20. 26士3.8. (N=7). 15-25. 5-6. (N=6). 45-55 50士3.2. 5.7土0.5. 35-45. 75±4. 1. (N=7). 35-42. (N=8). 5-6. 5.8±0.5. 6.9±0.4. 19土3.5. (N=7). 8. 7.3±0.5 70-80. (N=6). 17士2.2. (N=8). 5-6. 40士2.4. 15-20. 43±4. 1. (N=7). 6. 6.0士0. 38±5.6. 73±3.5. 7-8. (N=6). 8. 7.9士0.4. (N=6). 8-12. 19土2.2. 10士1.5. lobe. (N=8). 9-10. of teeth. 8.6±0.5. (N=5). 45-55. 26士2.8. (N=6). 20-28. (N=6). 14士1.6. (N=8). 6-7. (N=6). 30-40. (N=6). 15-22. (N=6). 20土2.0. (N=7). 8-12. 15土1.9. (N=6). 18-23. 20土2.3. 12-18. 19士3.2. 7.0士0. (N=6). 15-22. 30土0.9. (N=6). 7. 7.1士0.7. (N=5). 28-30. (N=11). 6-8. 6.9±0.4. 33士4. 1. 12-15. 23±3.2. (N=9). 7-8. 7.8±0.4. (N=5). 12-30. 50±3.5. ventral lobe (range) of teeth (average土S. D. ). (N=9). 8-9. 9.5士0.5. (N=6). 8.5-12. 10土1.5. 9.9土1.2. of■CI. Uncini. of Cl. dorsal. because. The the. to. (N=7). (N=7). 28-32. (N-6). 1 6士2.8. species. (N=6). 8. 7土0. (N=6). 70-80. (N=6). 12-18. (N=6). 25-35 31士3.9. pacITl'cus. coast. 6. species. species is distinguished. C.. on. 27±3.2. (N=5). 10-12. (N=7). 8-13 10土1.6. 15-22 19士3.2. is selected. the southern of. (N=6). exceed. 30. Crossland. is similar tubes from. are. C.. to. the small. cautus. U-shaped. cautus. the lateral lobe. takahashli'by. C.. The. new. by the absence. in reglOn-C. body. and. size,. ; and. it repro-. cm. n.. ll. sp.. longest,. shorter pacITl'cus AIO. are. a. longlmanuS A4. than. notopodia, similar. to. in length,. and. length. Al. 1904,. is shortest,. and is. All. is longest,. A9. slightly. 273) A2. C.. species. notopodial. nOtOPOdia,. All. thus. the Maldive. different. (Crossland Al. takahashli'. in region-A,. is shortest,. A9. C.. c鮎etoptel･uSlongl'manus. chaetigers. has. (N=6). 8-13 11士1.8. whereas. reminiscent. longlmanUS. pattern ; in C. are. length,. (Izuka 1911).. have. (N=5). 14士2.5. body. cm. (N=6). 25-32 29士2.4. 12-18. 21士2.4. du°es at 5-6. (N=5). 30士3.6. (N=7). 20-25. 7土0. 28-35. 55士4.5. (N=7). 7. 6±0. (N=6). 50-60. 42土2.7. 21土2.4. side. (N=5). 40-45. (N=7). 6. 6.2土0.4. pacITl'cus. takahashl'1', Whose. cirri. (N=7). 22-30. 11士1.1. (N=10). 6-7. but C. of ventral. (N=6). 15-25. (N=7). 12-20. (N=9). 18-25((N=6). the Pacific. of. (N=5). 42土3. 1. is distributed丘om. temperate. The. lo主o,5. 20土3.4. 17土3.0. 6土0. 38-45. 74土3.8. name. (N=5). 7. 8土0. central Japan.. Remarks.. (N=7). 37土3.6. (N=7). 10-ll. 6.4土0.5. 32-42. 15土1.9. (N=8). 6-7. 7.0土0. 29土2.2. 12-20. 26士4.2. (N=7). 7. lobe. species. the. (N=5). 34土3.8. 20-30. (N=5). 7-8. 7.2士0.4. 30-40. 56士5.3. of teeth. Etymology.. (N=9). 10-12 1 1±0.8. (N=6). 50-62. (range) (average±s. D. ) Length (range) (average土S. D. ) width (range) (average士S. D. ) No.. (N=7). 10-ll lo主o.5. (range) (average士S. D. ) width (range) (average士S. D. ). from. Size. obseⅣations. microscope by. expressed. 6士0. 42士5.7. (N=5). 40-50. Length. C.. ChaetopteI-uS.. light. pacl'(1'cus. 8.0土0. 76土5. 8. No.. coast. (N=7). 70-85. (range) (average士S. D. ) Length (range) (average土S. D. ) width (range) (average士S. D. ) Uncini. of Japanese. plate. lobe. dorsal. of B3 No.. species.. unclnl. sp.. 7.4土0.5. (range) (average士S. D. ) Length (range) (average士S. D. ) width (range) (average±s. D. ) lobe uncini of Bl lower (posterior) No. (range) teeth of (average士S. D. ) Length (range) (average±s. D. ) width (range) (average±s. D. ) Uncini. on. SEM. tus. u. 7-8. of teeth. No.. combined in each. by. neuropodium. (range) (average and S. D. ) Length (range) (average and S. D. ) width (range) (average土S. D. ) No.. of teeth. number. ;in to. A9. and. C or. A12.

(11) Three. is slightly Associated. as. The. crabs. and. other. orga山sms,. tification of. scaleworms,might (e.g. the host species. MesochaetoptenlS. Nishi. ,. and M.. Selangolus. CnaetopteTuS. or. 6B+8C. ill. in ZW-104,. 1C. such. mm. 1999. at middle. for. long,. japonl'cus).. Diagnosis. 20. Oculate in.total. mm. length,. lightbrown A. reglOn. 9. line separating ventral gers, without. of A4. neuropodium, providing. larger. embedded. in sandy. club. shapedina. with. w山te. and. bilobed. large,. many. uncini. Type. ZW-101,. complete,. with incomplete. Peninsula, bottoms. with. won. with. without worm. with ments. All. tube). for SEM. region-Awith. complete. observations,. tube),. complete. tube). ,. tube), ZW-108, sp?cimens (8 worms). of 2m. of. x. 2'm. on. the. same. ,. were. time. frag-. by. an. side dorsal. view. away.. Dorsal. Body. 14mm-4A+4B+6C ZW-102,. length. 4･5 to 19. in holotype,. 14mm-4A+6B+4C. mm. ; total length. 12mm-4A+5B+3C in ZW-103,. 19mm-5A+. in. ;. dorsal. or. reglOn. neuropodia,. yellow10range. and. re-. posterior. 9. chaetlgerS.. enroll ventral side,. horse-shoe. narrow,. and. C,. 7B,. with. D),. notcoveringcompletely. side. palps. slightly exceeding. 7B,. D). arising dorsally. ; width. A4. notopodium. (ventral glands by. etlgerS,. or. upper. ventral. Peristomium. in paratype-ZW-102. with. between. row. 107, 10. chaetigers a. with. of and. base. as. of. slngle. middle. in holotype. and slender. Bl. line. cha-. 2.3mm. 0.7 to. 0.8. shield.. of 10-20. row. D),. neuropodi-. width. ventral. bordered in color,. (Fig.. B),. 0-10. or. 8A,. at mm. Al. light yellow. worms). chaetae. plastron 7A,. line of dorsal. mm,. and. club-shaped. modified. and. limit of. slender. lower. ; white. 5or6inZW-106,. smaller. same. with. white and. leafllike chaetae,. a. A. shield leⅢgth 2.3. A5. provided. laterop-. posterior. shield) (Fig.. lateral straight. ;. A3. (Fig.. junction of. nearly. of reg10n. um. venral. short. peristomium. and. of palp. Two. width.. surface. separated. pushed. slightly plgmented. at. of prostomium. in. visible. fTeacal groove.. continued. border. and. peristomium. side of prostomium. ,. the lateral inner. on. (Fig. 7B),. grooved C,. (in holotype). ring-like. eye-spots. dorsal. when. brown,. worms) Description･. ; N=7. White,. ventral. in middle. the prostomium. of. (in large. collector.. mm. ; posterior. orange. brown. (in paratypes). dotted. or. slender. area. on. A pair of purple. side.. width. holotype.. as. a. worm. with. collected by. (one. (one. (one worm same. worm. ZW1105. ZW-106. data. (one. (one. -ZW-104. ZW1107. para-. -ZW-103. tube). complete. some. Creamy. brown. greenish. neuropodia. long. Ventral. (one. up to 19. (9A+5B+5-8C. especially. low. (Fig.. shaped. 20 October,. but. complete. ,. tube),. complete. with. deep,. reglOn. peristomium. sandy. Paratype:CMNH-ZW-102. complete. dissected. podia. 15-18m. Japan,. mm. holotype).. posterior. osterior. tube, Tateyama,. Pacific side of Central. Nishi.. CMNH-. 6. and. worms. 215. width. glOnS.. with. openlng. material :Holotype,. with mbbles,. by E.. worm. U-shaped,. for apertures,. except. examined.. 1998,. Tube. 5 to 8. body. at opening. chaetigers. clear white. dorsal. notopodium. Materials. mud. 5 chaeti-. fragile,. fixed. complete. Peristomiumflipllike,. area,. 4.5mm-2A+1.5B+. and posterior reglOnS. Region-A. branched.. sometimes. Boso. ;. all bilamous. with. of male. transverse. with. of teeth.. number mud. low. with. lobe. in. color ; uncinal. modi-. 2mm. to 22. withup. female. B2 ; reglOn-C. extended ventral. with. neuropodia. and. to. purple-brownin. ; reglOn-B. yellow. Bl. with. size up. and velltral glandular. notopodia,. u血lobed. chaetigers,. of small. about. ,. side of middle. clear. chaetigers,. cramy. fused. with. eyes. chaetigers. gland. 8. in inner prostomium,. chaetae. with. 7,. (丑aetopterus. color and deposited fied. 2D,. and. part). Anterior. japom'c上げn. SP.. Figs.. slender. (tube width. for iden-. in ZW1105,. in ZW-106,. in ZW-107,. 9A+5B+8C. C丑aetoptenLS. 7.5mm13A+2.5B+2C. 9.5mm-2A+5B+2.5C. appearedin. be useful. commensal. species. 14).. (Tn'todynaml'asp. ). crabs. tubes.. some. (see Fig.. All. than. shorter. new. to or. A4. brown. (in smaller. amber. (0. in number. in ZW1. 9inZW-103andZW-102,. ZW-105), than. ventral. dorsal ones,. side +10. chaetae to. 20.

(12) 12. Eijiroh Nishi. Figure. 7.. -. B2. Holotype showing. prostomium c3. showing. of C凸ateopteTuSjaPOn)'cus feacal. rlnged-eyes, and. palpi.. bilobed. D,. ventral. n.. groove. upper-ventral parapodia. and. sp.. A,. Right. wingllike. view. showlng. (neuropodium). view. notopodia. ,. Ventral dorsal. ones. worm.. of whole of Bl. plastron with. C, and cirri. upper. B,. dorsal. view. anteiror. (打row). of. view. worm. segments on. dorsal. of reglOn. showlng. and. Bl. Peristomium,. of reglOn-B. side.. A. Scales. E, are. B5 1. mm.. to.

(13) Three. lanceolate. slender to. modified. chaetae. (Fig. 8D). of yellow,. some. bordered. provided. ; lanceolate. its surface. fully. smooth. of notopodia. slightly different. in holotype,. A4. A5. than. notopodia. Al. to A6,. fromAl. A9. to. 2･0,. 1･8,. 0.8,. 1.0,. 1.3,. elongate,. longer. than. B),. a. 1.4,. of. reaching. both. rami. side. fused. A3. or. ; B3. B5. to. Neuropodiafleshy. lobes. biramous. Bl. (anterior)and lobe. 1iptlCal, with. in number. size and C. and. Dorsal number. between lobe. 卜m length Posterior. (N=7).. distally. 20). and. to. B5. in. a. single. region. of both. and. mm. in holotype. (Fig. 7A). or. or,. with. two. branches. digitiform,. ; neuropodia. lobe rounded,. 7E,. rings and with. (1. sociated. branches. among. thin,. not. tube. Tube. openlngS. in. diameter). in diameter. opening). ;inner. side. outer. usually. branch. main. part. (about openings. fragile tube. of. sidewith. and. as-. Tubes. twice. of. (about. partly tough. or. thin,. with. sands. with three. tubes.. in both ,. in col-. White. in most. central. sand. lacking. rarelywith. ,. tapered. ,. at. layer,. tubes). tubes),. with. openlngS. branches,. connected. wider. and. only. 10. 10. openingvertically. greater part of the tube. some. among. both. white. fragments. and. gravel.. ReproductioI-.. Separate. maleandwith B. glOn. and. cream. whole. holotype. sex,. white. chaetigers. and. -ZW-104. in posterior. colors. re-. of reglOn-C.. uncini.. Tn'todynaml'a. with B2. crabs. brownish sp.. sp.. both. tubes,. and. immature.. are. crab,. ZW-102. and. An. (Polynoidae). worm. scale. Pinnixid. in holotype. appeared. crabs. A. polychaete.. unidentified Harmothoinae. ,. in ZW-104.. appeared. to el-. in. B. and. Etymology.. The. for its type. name. species. locality,. is chosen. JaPOnl'cus. Japan.. (Table 1). less in. uncini row. about. 50. 5 to 8 chaetigers. ; notopodia. with. (Fig.. cirri. substratum. of shells,. branches. long,. of the. (5. ,. with. other materials.. Associated. varied. reglOnS. lobes. with. substratum,. fragments. ventral. of BI. teeth,. minute. lateral. (including. D-shaped. and. (Fig. 2D). the surface. Remarks.. The. acicular. knob-likeintlPS subdivided. anteriorly oriented. fewer in. upper. on. C.. takahashli',. species. takahashli'by it reproduce. from. C･. chaetigers the. occurred. is similar. species. new. mm),. ferent. chaetae,. as. and C. 20. unilobed,. The. pacl'fl'cus and ped.. (region-C). in anterior parts,. in the sandy. are. (Fig. 8F).. all biramous. reg10n-B:each. biramous,. ,. lower small. a. (uncinal plate). of minute. nldimentary. U-shaped. (Fig. 2D). bearing. without. bluntly. parapodia. extendingト2 longer. to. dorsal. of teeth between. upper. in B3. (15. row. single. B2. dorsal. in size,. similar. 6A,. (posterior) lobe,. Uncini. only.. Tube. of shell and. (Fig.. lobes. (Fig.. lobe. arrow).. 2mm. Cha-. lower. oriented. of both. minute. Bl. ; neuropodia. lower. with. (Fig. 6A).. uncini. B2. and. lobe. mucous. Notopodia. with. row. and. notopodia. (Fig. 7A).. ; uncini. B2. large-flip. circular. 7E). opening. Bl. of region-B. side, extending. lower. 1.5,. (allinmm).. 0.8. the side,. of. and fully encircling. with. 1.75,. notopodia. neuropodium). upper. length. 5 chaetigers.. with. parapodia. formed. without. 1.75,. chaetigers. subdivided and. shorter. notopodium. 1.0,. uniramous. (Fig. 7A).. cupule. and. and posteriorly. sands. A5,. and. 13. dorsal lobe,. and. lnCreaSefrom. dorsally,. glandular. A2. than A3. ll,3,. 1.2,. following. pair. A3. ChaetopteI-uS. or. below. many. at fixation,. than. ; each. (region-B). region. leaf-. 0･8;inparatype-ZW-102-0.7,. 1.5,. etlgerS. bearing. to A9. 1･5,. folded. provided. gradually. in holotype. 1･6,. Middle. longer. usually. decrease. single and. condition. shorter. A4. ; notopodia. a. (Fig. 8D).Length. small teethwhenviewedonSEM. in paratype-ZW-102,. most. chaetae. chaetae and. on. with. lanceolate. asymmetrical chaetae. its surface. straight chaetae. A5-A9. species. dorso-posterior. teethon. many. 2-3 simple. with. row. 1ike,. with. (Fig. 8E).. posterior. (Fig. 8C). chaetae. new. the small 12. mm. pacl'(1'cus and in reg10n-A･ Peninsula,. C.. in. cautus. whose. is distlnguished. Boso :. C.. to. body. tubes. are. U-sh由一. from. C.. cautus. size. body. longlmanUS. species. intertidal. (maximum. length.. to. It is difby. At Hazama, 3. C.. cau[us,. havl甲g. Tateyama of. the. shallow. genus water.

(14) Eijiroh Nishi. 14. Figure. 8.. Scanning Showlng. chaetlger chaetae. F,. 10. to. japonl'cusat They. are. tentatively. the general. modified. reg10n･. D,. lobe. size of. C.. and. ChBetOPtemS. and. CButuS. CautUS. Marenzeller,. ChaetopteI･uS. CautuS. :. 6-8. Izuka,. 1955. Uschakov,. ;?. (abstract: 619-620). chaetopterus. 432-433;Okuda,. opedatus) Material. ,. p.. examined.. p･. p･. 1935. Nishi,. Hazama,. 24,. subtidal,. 1997,. leg.. except. plete. worms) hand,. 143･･. Fig.. port,. 12;. ; Petersen,. ,. 血-. &Hartman,. 1964. Boso-Pen-. -ZW-515,. near. Universlty,. slender. 29,. 1eg･. M･. Faculty. ofSciences,. June. 12,. May. 1995,. 19,. 3790,. Hokkaido. Aio1eg･. Nakamichi, 1eg･. R･. Laboratory. June. vanopedatus,. subtidal, Sato;CBM-. Aio-machi,. Marine. No.. 10 incom-. over. subtidal,. 1996,. Hokkaido,. -. -ZW-517,一. Amakusa,. Aio-machi,. Oshoro. May. (allonewormwithout. 1996,. June30,. Collection,. hand,. -ZW-516,. Hondo,. Pref･,. Okuda. Chaetoptems. A4 A4. -ZW-512,. including. -ZW-520. ;OMNH, ,. right dorsal. simple. by. T.Kikuchi;ONHM,. Yamaguchi. YamaⅢishi. C,. Nishi;CBM-ZW-511,. Shigaki,. June. leg.. dorsal. bottoms,. Tomioka,Amakusa,. Osboro, 1911,. chaetae･ most. -ZW-520 fわr. aguchiPref･. 2002.. Tateyama,. 1963,. E,. muddy. -ZW-514,. tube,. by. (astypeAofC. 88193;Imajima. insula,. modified. chaetae.. A･. sp･. 7 teeth･. with. zw-518,一ZW-519,. 434-435,. (not Renier) :Izuka,. vaTl'opedatus. uncini. japonl'cus n.. A4. right. of. 1879. 19-20, 1996. ;. small. of. plate-like. ZW-385,. 1911,. Blake,. view. dorsal. ZW-513,. the number. 1879,. 1944,. ;Caullery,. close-up of A4. ChaetopteTuS. of. by. 2Ⅰ∃,9. ChactopteTUS. p.. C.. at丘rst glance by. B,. showing. deeper).. Marenzeller,. Figs.. 1997. neuropodium. pacl'fl'cus and. distlnguishable the body. view. in reglOn-A.. chaetlgerS. Figs.. chaetae･. close-up. (and probably. depth. m. B3. of right. (CMNHIZW-102). paratype. plate-like. depth),. 10 to 25. of. Club-shaped. dorsal. m. micrographs A4. broad. with. chaetae.. (down. electron. 1996,Leg･ ZoologlCal Universlty,. Loc･Amakusa･. R･. Yam-. Yamanishi; of Hokkaido K･. Yabe:. Institute, SP･. name. Collector.

(15) rmree. ?;CMNH-ZW-1056,. (without tube). 1064. Boso. Peninsula,. hand. uslng. 20. 25. -. leg.. SCuba,. deep,. m. M.. new. species. bottom,. sandy. (加etopteI-uS. B4. Tateyama,. ,. or. B5. and. in A皿akusa. chaetigers. Notopodia. ones,. Large. Ventral. chaetigers,. 7. (14mm). 2･O. mm. white length. est,. 3.0,. to. 3.0,. side. of. as. :. 4.0,. browns. knob-like. modified. 10. region-A. with with. (5.6-6.0 mm. plate-like. small. Distance. 9A).. in. between in. in. bilobed,. right. (3. width. a. ;A4. of. acicular. chaetae,. dorsal than. in width,. 9A,. C). with. twice. of. A5. ones. small one.. 6-7､mm,. Bl B3. with. smallest,. ones. ventral. (Fig. 9D).. sides. 40cm. over. in long,. lntertidal to shallow 20m. to. rarely. deep). 1935. 1996. Fukuoka,. :. Seto一Inland. sandy. 1879,. Pref. Nishi. study. ,. (Hokkaido. (Blake 1996). North. America. are. iI- eastern. not. Peninsula,. Kamtchaka,. this. area. of. Japan. Sea,. and this. study). Side of North. the specimens. although. ,. Marenzeller. in cold. 1991,. :. Misaki,. ;. Bay, Boso. Buzhinskaja. 1996. et al.. ONHM. distributed. to. distributed. and possibly. of. Tateyama,. :. 1911),. 1955,. in Wada. 1911:Tokyo. Izuka. 1944:. Yamanishi,. this study andOkuda. :Amakusa,. specimens. 2002. lzuka. and. of Japan. area. Kumamoto,. Yamanishi,. Sea,. Kanagawa. to neo-troplCal. Amakusa,. and. to be. ,. ,. Ameト. of eastern. here.. available. B3toB5 number 9 to 10 2.5-3.0. C凸aetopteI-uS. synonym. ofC.. (1997). mm,. ventral. &. I regard. description. of Okuda＼s. cirri. thus, was. Okuda. vaz･11opedatus fromAma-. (No. 3790). dorsal. in Japan. Following. itas avalidspecies.. of C.. University. considered. 1964).. dried specimen. and. been. (Renier). Hartman. reglOn-C neuropodia,. (1935). had. CautuS. van'opedatus. type A. noted. of Hokkaido entary. of mm. (1935). kusa ; I studied. in the. at most. lesser. neuropodia. Bl. supportive. B2neuropodiaunilobed,. ventral B2. or. both. supportive. lateral lobe nearly. :. OCCurrlng m,. with. bilobed,. mm. region (Philippine, Caullery. pacific. (e.g., Imajima. 5 chaetigers, many. chaetae,. of uncini. Temperate. inWadaetal.. Remarks. iⅢ CMNH-ZW-. with. A4. reaching. (Fig. 9A).. bilobed, uncini. (Fig.. triangle in shape,. notopodium. side. muddy. Petersen B. in. 4.5. (Fig.. 1056). Region. 3.0 to. cirrion. 10. to. Distribution.. ica. parapodium,. nearly mm. and. Uschakov. left neuropodia. and. unilobed,. bottoms.. temperate. Region-A. neuropodium. CMNH-ZW-1056). neuropodium. ventral. Last chaetigers. shaft.. unilobed. 4.0. (N=20). number. 15 to 20 in number. chaetae. dark brown,. ll. or. to. and. openlng,. (down. 2.5,. (Fig.. on. (Fig. 9A).. divided. with. Kagoshima. large,. small,. (CBM-ZW-511. (Fig. 2E),. U-shaped. to western. eye-spots. of region-A. Prostomium. long. 50. maximum. specimen. small with lessor number rectangularwith. width.. chaetigers,. Neuropodia. chaetae.. A9. 5.0,. distributed. spots. or. dorso-lateral. extending. appearance. 9,. cbaetigers. 4.2,. Peristomium. palps.. anterior chaetigers. many. A9. being. mm. Brown. ventral side,. peristomium.. two. each. in. 4.0,. of small. sides surpassing. B). length. 3.6,. on. enroll slightly. 9A,. each. 3.7,. base. on. present. shorter. uncini. mm. short-. to. thall longest. CMNH-ZW-1056).. of. acicular. water. 1.5 to. about. pOSteriorly. slightly. shield. notopodia. All. 3.5,. (right side. Al. lnCreaSe. gradually. AIO;Al. or. by. without. Tube. (CMNH-. to A6. shield separated. last chaetiger. AIO,. ventral. atA4. line to chaetigers.. anterior. length,. inperistomium. and. of width. at. cha-. last chaetigers. to mm. AIO. to. double. ventral. 10. ; width. excluding. wider. B3. width. in A3. mm. ZW-1056).. slender,. in matured. cm. at reglOn-A. same. (Fig. 9A). Al,. length. mm. 20. tb. up. plastron. nearly. of region-A and. 8. excess. width. etlgerS.. worms. 5. about. 20. over. with. -zw-520). Description.. in size,. similar. Region-C. by. Aizawa.. 15. based. on. it have. rudim-. the laterallobe. I conclude on. :. Collection. C.. of. that Okuda＼s cautus..

(16) Eijiroh Nishi. 16. Figure. 9･. CnaetopteTuS. prostomium,. (dc) 4mmin. and. peristomium ventral. A,. CautuS,. 2mmin. cirri. Al･. and. (vc) B-D.. from. SPeCimen. on. C･. lateral. Amakusa.. Right. A･. lateral view. neuropodial. lobes.. Ventral. view. of B2. B4･. ne,. -. of D.. neuropodium.. reglOn ventral pe,. A. Bl･. and. view. of. peristomium.. B･Anterior. reglOn t,. C. showing. tentacle.. view. of. dorsal Scales,.

(17) Three. ChBetOPtemS Cnaetopten)s 8-Figs.. pl. Material. species. 1911. hikahashll'Izuka, 1911,. taka17aShli'Izuka,. new. 4341435,. p.. 9-12.. body. length.. body. width. material. A4. studied.. gth,. each. width. 13. ber,. Large. about. A7 and. Bl. notopodia. one. ReglOn-A･. rows.. 17. in whole. covered. length, usually. long. and reach 8. Tube. in diameter,. mm. uncini. unciniwith. reglOn-A･. lワng,withoutbranch,. dark. chaetae. by sands,. teeth. IACality,. widely. (Ehime. kuni. Iyo-no. ). Pref.. Hiroshi. (forming. ).. coll.. mm. C.. The. (Renier). vaI･1'opedatus. (okuda. 1935,. distinguished. larger. body. cautus. and. Type. than C.. Japanese. Hartman. but. 1967). number. of. of. with. researchers. of reglOn-A. (discernible) eyes,. that. are. specimens. some. synonymized. other. similar. Museum,. polychaete. Universlty of lzuka. specimens. (e.g.. weredeposited. its detailed. with. small. gers,. C4. the C. characters. are. Materials. tube). ,. Japan, 1995, -zw1357. Holotype,. examined. Futo, 10-15m. 3A,. Izu-Peninsula, deep,. mud. byhandusingscuba,. (data same. n.. as. Small. body,. Bl. neuropodia. width. 3. ones,. succeeding. notopodia. Uncini. neuropodium. row. of. simila工in. of lateral lobe wider. dorsal or. C5. rudimentary. that vent工al. Cirri at anterior. and succeeding. (Fig.. 10C,. E).. very sand. and. on. sandy. rud-. (Fig3A). Tube. 5-10. inside lin1ng. mucous,. shell debris,. chaeti-. lacking. chaetlger. thin membranous. outside on. occurred. covered. underside. of. mud.. Distribution.. Sagami. Bay,. shallow. water,. 10. to. deep.. sp.. CBM-ZW-356 Paci丘c. side. and rubbles,. (with. The. for the type. locality.. Paratype. holotype).. less than 30. Remarks. by. in whole. C.. This. building. unlque. epithet. or. leather. tube. longli)es and. new. tube. afragile. All other member. rocks.. mm. species. is named. l'zuensl's. of central. 15 December. Nishi･. Etymology.. like. Descript唾.. in C. long,. slender,. 1997).. 10. 1eg･ E･. lateral lobe. pro-. separated. neuropodium. in length.. with. rock. unknown.. )'zueBS)'s. Figs.. 3-4皿m. light. uncinl. Region-C. cmlong,. (including. with. (Fig. 10A). than. 1.2. arranged.. neuropodia. notopodia. longer. 1.4,. chaetae. twice of each. Bl. Al. about twice size. Lateral lobe of C neuropodium. 15m. (丑aetoptems. side A9. 6110mmindiameter,fragile,. Of Tokyo,. 1.6,. irregularly. long in ZW-356.. imentarycirri. by. Nishi. mm. and. cha-. species,. 2. size although. lost ; I failed to find. probably. ventral. ones,. and. sucker). alld long,. it is. pacl-fl'cus.. typespecimens) Thus. by. &. Imajima. any at the UI-iversity where. been. by the higher. the absence. etigers,. had. species. a. 1.5,. modi丘ed. fas. Notopodial. length丘･om. each. neuropodia. Both. cbaetiger. wide,. slender Remarks.. 8 teeth.. or. chaetlgerS. plate-like,. (about 1.5 mm) (0.7to 0.8mm).. width. Gogo-shima. ,. tough. ; width. between. 1.4,. A4. of. and A2,. length. A,. 1.3,. bilobed,. parapodia 7. 1.2,. as. in A9. in general･. mm. in-ZW-356.. in color,. viding. 1imestones,. 1.2,. reachingtoAI. (Fig. 1) (Takahashi. Island. (in mm). 700. shell debris.. and. 1.0,. brown. O･5. in all reglOn. similar. toA9,. iⅢAl. 1.5 mmatA9, white血e. shield. same. neatly. narrower. 2･4mmatA5,. ventral. A9. in width,. in-ZW-356,. length. width. ,. Palpl Small,. chaetlger.. VeI一tral shield wider. decrease. mm. simple, mm. excluding. (in mm). in length. B+3-8C. in length,. mm. 4mmatAl,. and. long,. mm. notopodium.. 4･2. mm, num-. ; palps. wlⅢg-like,. of. len-. C in. Cbaetigers. Region-B. than. body. 220. modified. iI1 2. extended.. smaller. B+. discernible A4. 15 in number,. when. A+70. Eyes. in length.. with 7 teeth.. in whole. mm. parapodium.. 12A+5B+43C･. brown,. 45. excluding. 12mm. 315. length. reglOn. mm. body. 4-6 A+4-7. 5. gradually Description.. 17. 2-4. maximum. : Ⅲo. examined. C丑aetopteI'uS. or. Species from. is characterized. a. sand. underneath. of the genus. have. parchmenト. (Fig.. 2A,. Cnaetopterus. D, sp.. E),. except. (Fig.. 3A,. fわr B,.

(18) EijirohNishi. 18. The. C). on. absence. of rudimentary. lateral lobe of reglOn-C Bl. straight. ofC.. long. The. species.. Bl. long. reglOn-A have. a. tube. Bl. cbaetlgerS parchment. tube. from. sands.. made. is similar. (1944). notopodia. that. that the C.. exceeding. those. But. the. Cnaetoptems. and. to. noted. head.. the. and. the. with. Chaetopterus Fig. Material of. tube). one. ,. worm. side of Boso. Aizawa,. 19. 0ct.. (with tube), December. and. 1996,. Futo,. Japan,. central. Ubara-Jlma,. beds. oyster. bed,. seagrass by. and. body, 16. One. mbbles,. without. mm,. width. 6mm. 8A. 4. excluding. iⅢ size in body. lOmm number. to. in. inside. diameter,. exceeding. A3,. Fig.. lightgold. deposited smooth. in. on. not. l'zuensl's. differentiated A4. row. without. ventral. side,. small,. bilobed. :. length. groove,. tlp tapered.. Last. (Fig. llB).. Bl. llF,. with. dc),. mouth. of. a. shell stones. of. underside. with. 3,0-5.0. white. afragile. sand. 1'zuensl's. by. mm. membranous. (Caullery, 1944). reachA2. color. its. of. of a7aetOPteTuS looks. like C has. the first chaetlger Bl. ; the. (Fig.. notopodia. Of of. (CBM-ZW-378). Katsuura. at most. orA3. the. the latter species. to. extending. but it is. tube,. It also. but. sp.from. of Cnaetopte-. chaetae. gold.. 1944. notopodia. chaetoptems. Chaetoptems. llA,. B).. ChaetoptenlS. (Al. plate1. missing. chaetae. in. triangle. edge. reglOn-A. notopodia. Text-Fig. 40;. p. 277-278, Nishi,. 1996,. Figs.ト3. ‥. van-opedatus. Okuda,. (as type. 1935. v∂n'opedatus). Materials. -zw-30,. in. to. -ZW-31,. dead. ,. -ZW-32,. -ZW-25. branching coral-reef. branching. coral. area,. colony. were. examiⅢed) :. -ZW-28,. -ZW-29,. -ZW-33,. (colony of coral. Okinawa,. worms. -ZW-27,. -ZW-26,. tube). with. (over 20. examined. CBM-ZW-24,. shaft. viewed. 1904,. a. light amber. mm,. 12. Crossland,. 1-2 plus. ?亡丑aetopterus B of C.. 4 to 6 innumber, Ilo. 42-46,. p.. -. longlPeS. 2-Figs･. Pl.. 1904. loDg7bes Crossland, Fig.. (Fig. llB).. one. to. small,. is reminiscent. or. Caullery,. region-A. dorsal. peristominal. 800トLm head. A,. worm. bilobed,. nottough,. neuropodia. On. ; the A4. light yellow. are. long. C.. chaetae. crosslandll. large,. chaetigers. exceeding. (Fig.. bent. in length,. specimen. reglOn-A,. nip-like,. (leftside. of. and. mm. lining. from. modified. total. Peristomium. ventral side. modified. incolor, a. at. prostomium. by acicular. preseⅣed,. mm. region-A. palps. -ZW-378) (Fig. llA, B). A4 or. 2.0. 50. in building. 15. color. 2.5A+4.5B+3C,. lateralsides,. C),. specimen. in. poorly. 9A+5B+8C.. slightly extending absent.. Another. ; width. anterior. Short. reglOn.. B. -ZW-378,. and. llA,. creamy. This. ms. Nivshi.. at reglOn. reglOn-A,. supported. layer.. of. total length. chaetae. unilobed,. (Fig.. (Fig. 3C) about. mucous. complete. 5C,. +. partly. length. ventral. side. like,. at. dorsal. of chaetlgerS. extended. +. chaetae. incomplete,. smaller. Eye. mm. fわr greenish. -ZW-359,. 5B. tube,. including. except. (-ZW-378)with. worm. B).. notopodia. sand-formlng. (-zw-359),. sp. Description.. llA,. (Fig. llF).. fragile,. Remarks.. side. leg. E.. SCuba,. exceeding. M.. coll.. Pacific. mud. by hand uslng. deep,. CBM-ZW-359. hand.. deep,. Pacific. 10-15m. Izu-Peninsula,. 10-15m. 1995,. Katsuura,. at. collected. Peninsula,. dead. among. (with丘･ag皿ent. Wing-like. in tipsweakly. vent工al side. (-zw1378). ll. CBM-ZW-378. examined.. on. of uncini Tubes. sp.. Notopodia. (lateral)lobe. Dorsal. cirri. row. neuropodia. bilobed.. (Fig.. knob-like. slender,. llE).. and B2. itslength. 6 chaetigers,. bilobed.. chaetae,. do. neuropodia. region-A. with. neuropodia. species. l'zuensl's. of posterior. ReglOn-C. of. B5. Bl. large, triangle in shape,. notopodia width. to. B3. unilobed,. of. characteristic. notopodium. Caullery. cTOSSlandl':. cTOSSlandl'has. also. with 5 chaetlgerS,. ReglOn-B. side. and the slender,. neuropodia are. notopodia. dorsal. on. cirri. many. m. Cape,. Zampa. deep,. (Fig. 12D),. attached. worms. skeleton), 0.5. (each. -ZW-34. among by. hand. dead with.

(19) ¶1ree. Figure. lO･. C丑aetopterus. indicate Cll･. A4･ D･. tentacle.. B･. Right. l'zuensl's. Mainly. SP.. anterior. ventrolateral. Scales;2mm. n･. (A-C). specimen. ･. view. view and. Species. from. of prostomium B2. of 1. new. mm. B5･. lzu and. E･. (D, E).. or. ChaetopteTuS. Peninsula･. A･. view. Ventral dorsal. peristomium,. Ventral. 19. of. at. view bottom.. left neuropodia. of. reglOn-A C.. Left. Cl-C4･. ne,. and. B. 1 ;. lateral view neuropodium.. arrow. of. B2t,.

(20) Eijiroh Nishi. Figure. ll.. CnaetoptenLS. views. A. Al-A3 Left. ofreglOn ;. SP. and. left tentacle. lateralview. peristomium.. of t,. SpeCimen Bl. ;. lost. B31C3.. tentacle.. from. Katuura,. indicate A4.. arrow. D.Left. ventrolateral. F.Left Scales. Boso C.. ; 1mm. neuropodia in AIC,. Perdnsula. Anterodorsal. (CBM-ZW-378). view. of. 0･5mm. and in E. A. region (specimen has. detail of A71A8 Cl. of. C2, &. ventral F.. view.. A-B. with. Dorsal(A)and. prostomium,. only dc,. 8 parapodia dorsalcirri.. leftventrolateral. peristomium in. and. region-A)and ne,. neuropodium･. (B). segments Bl.. E. pe,.

(21) Three. scuba. May. gear,. ZW-421,. 5,. 1995,. -ZW-422,. (each. -ZW-423,. among. livlng branching. with. scuba. gear,. (colony kusa,. west. scuba. gear,. Remarks.. 5-10m. leg.. Nishi,. a. E.. detailed. responded. they. are. 0ct.. descrlptlOn. very. (丑aetoptems Chaetoptems. with. Of the species,. 1ike,. on. 5. in size.. reported. (Smith. as. & Harriot,. longli,es.. 1855. cBPeβS)'s Stimpson, Stimpson,. 1855,. Day,. van-opedatus;. 1967. shield. brown. in color,. ofA4 with. Oculate. white. 15. glandular. length. (inmm). A5-3.2, a. row. ventral larger. Materials. notopodia. 1. in1995. cruise by. 1ection. large, of. mud. teeth.. except. South. Tokyo. Sea Lift. and. and posteriorly. rounded,. collected. detailed coレ. site unknown.. +14C. in chaetlger. (in mm). of each. number, region,. up to 30 5A. +5B. slender. long. mm +. and. 14C. ; 9A+5B. in length. fragile,. 5-6 brown. with. up. with. Bl. B4. 1.8mm,. (region-C). in Cl. gradually. 1･4. and. in C12,. mm. lower 1. shorter. 1･O. :. each. lateral lobe,. upper. in Cl. in. mm. digitiform,. ventral lobe,. mm. unilo-. subdivided. oriented. 14. with. ; notopodia. mm. 4･2. notopodia. all biramous. (width. A9. uncini ; both. many. region. oriented. and. 10 in number.. to. B32.Omm,. (1984A, B). both. lobes. right).. separated. epifauna･. In fauna. include. C･. species. are. body. and. cautus. tubes. ized by ple,. C･. one. small :. two. form. C･. and build. (thispaper).. or. cautus. two. body. U-shaped. a. C.. sand. tube. some. species. characteristic. is characterized. by. (s).. or. thin. and Cna-. to the are. and and. epifauna. tubes. 1'zuensl's. In addition. spe-. infauna. types,. aFPendl'culatus,. they include. characteristics,. all C鮎etoptems. revised. species and. usually. SP.. tube. ON. theminto. cies and. membranous. length. A4with. DIS CUSSI. etopteTUS. 些声Cription. Body. A912.1.. row. Notopodial. widely.. anteriorly. in size. at A5. mm. U-. complete,. Park,. 5. A4-3.0,. in tips distally ; neuropodia. lobe. at. Ventral. with 4 to 5 acicular chaetae,. fわrapertures,. coast,. at A5,. biramous,. notopodia,. last chaetiger,. Petersen. African. 3･5. extending. one. A3-3.3,. chaetae. Parapodia. chaetigers･. similar. brown. Of. A2-3.0,. each. Posterior. mm.. 10. many. palr. side･. B22.8mm,. bi-. Tube. A. A8-2.5,. of reg10n-B. mminlength,. nob-like. not. shaped,. of both. chaetae. separated. with. with. CMNH-ZW-1053,. examined. tube,. yellow. nip-. notopodium.. mm. in width,. mm. in posterior. and. (A). A712.7,. modi丘ed. bed,. Peristomium. side.. 3. Aト2.1,. 4-5 amber. branched.. SOmetimes. complete. creamy. notopodium. lobe. number. in sandy. chaetae. 9 segments,. Region-C. extended. eyes. chaetlgerS. gland. specimens･. with. embedded. openlng. ; regioⅢ Awith. ventral. preseⅣed. providing. shaped,. modified low. of. of club-shaped,. Parapodia. size,. long. Hswellingl'dorsally,. anterior. A613.2,. 1･5. dorsal. Region-A. horse-shoe. dorsal. in length,. side notopodia. (not Renier).. Of small. of each mm. base. 3911. light brown. line separating. neuropodium,. uncinl. with. a. area,. chaetigers,. lobed. tube. in. transverse. in live and to. with. club shaped. ventral. ChaetopteI･uS. openlng. White,. brown･. side,. fluid-filled. between. B5 Diagnosis･. at. the lateral inner side of the prostomium.. short. cor-. Was. mm. Creamy. chaetigers･. ventral. eye-spots. side lobe. less than 30pm. 9. completely. Small,. reglOnS greenish. with. coverlng. the dorsal. obseⅣations,. region. enroll. but. C.. capensl's. ? Cnaetopterus. band. the base. Sp･. 2. about. part.. posterior. narrow,. and. on. small,. ; it is probably. Ama-. neuropodia. living coral in Australia. smothering. and. side of middle. 1993.. the basis of SEM. on. width. at middle. Anterior. unilobed. C鮎etoptcI.uS. unidentified. 1999). 19. by. tube. mm;. mm. noted. region-B,. exactly. although. He. deep,. 6. 0.5m by hand. Ushibuka,. ,. 21. 5-7. width. 1996;CBM-ZW-525. sponges). Chaetoptel･uS. or. and. Okinawa,. coral colony, 5,. Kyushu,. (1996).. the posterior. An. May with. For. Nishi. see. worms. of. Nishi;CBM-. Cape,. deep,. species. -ZW-424,一ZW-425. Zampa. tube),. with. leg.巳. new. habitat. characterFor. exam-. the presence. of.

(22) EijirohNishi. Figure. Chaetopte'us. 12. Bl.. C,. tentacle.. longlPeS･. lateroIVentral b. and. c. show. view. A, or. reglOn. B2. ventral to. ち and. view. reg10n-C･ C.. or. region-A. D,. respectirely.. colony. and of. anterior C･. reglOn-B･. longlPeS･. B,. COllected. lateral at. Zampa. view. or. cape･. reglOn Okinawa･. A. and t,.

(23) Three. ventral. lateral neuropodial. on. cirri. ; C･. terior chaetiger. base. (A). of the modified. A4. cnaetopterus. 620).. p.. similar''digitiform. (1997). sen. low. noted. and. building. by. the following. capensl's have be. might. Nisbi. (2000). al.. ChaetopteTuS.. pale brown. presence Eyes. of. or. absence. and. into. peristomium. and. are. light brown. C.. circular. japonl'cus, fTor. deposition,. and. differentiating. of palps. cautus. a. 13D). Just COnneCted. with. some. The are. species,. They. colors,. possibly. in. flipllike in C･ have. a. cautus. simple. Katsuura. andC･. in. for. llA,. B,. 3). Differentiation. pacl'(1'cus,. side and. Other species. ChaetopteTuS perisomium. A. from. SP･. with extended. chaetigers. the number. of reglOn-A. 9-llinC.. species. longli)es and. ponl'cus, The. genus. number or. 10). of region-A ll. chaetigers. of reglOn-. by. varied. or. (n=10,. l'zuensl's. into two. cbaetigers,. head,. (C.. shaft with. rec-. enlarged Among has. 1'zuensl's. dorsal. and. Fig.. pacITl'cus,. shaft with. of C.. with. the a. head. (Fig. 13C).. sides. on. last chaetiger. usually. has unilobed. of neuropodia. e.. g.. 2. or. 3 ;. and. 2).. by the. groups 9. uncini,. for that of C･ longlPeS,. except. are. (Crossland 1904).. absent. size. of. each. cbaetiger. by. (1904). Crossland is probably. of region-A. the A9. AIO. or. The. inC.. (Fig. 14).. InC.. A9. are. C.. and. A5. and. A5. and. (Fig. 14).. As. noted. A3. than. A7 C･. A3. shortest,. pacl'(1'cus,. pacl'(1'cus show. an. species.. notopodium. trend appeared. same. Aland. capensl's, lollgeSt,. are. the lengths. in each. chaetiger. is shortest･. pacITl'cus. the size ofregion-. ,. different. is longest and Al. 7). (n=5). ; 9 inノ∂-. 20. ,. of reglOn-A. longer. and A2,. than. in the above. is. A6,. remarks. of region-A. notopodia. trend. opposite. A4. to. those. of. longlmanuS.. here,. studied. appeared丘Ⅹed. be separated. might. and. if the number. In 2 species. the number. shaft. (Fig. 13A-C).. absence. cautus,. of C･. (n= 20) ;11112inpacITl'cus. cautus. In other. or. noted. shorter. chaetigers. is available.. ventral. chaetigers. and. will be easy. bead,. chaetae. neuropodia. In C･. C).. of region-A. head,. is separated. (Fig. 14). on. Number. modi丘ed. section. the A4. comparative. 6). living. prostomium. the ventral. on. peristomium･. has afrilledfleshy. (Fig.. sides. and. is inrolled. peristomium. cross. last chaetiger. whose. A. Tbe. chaetae. section. cautus,. site of. useful. particularly. of peristomium. in. neuropodiawith. As. Morphology. cross. or. species･. ; club-shaped. plate-like. enlarged. Tbe. specimens.. 2). section. presence. part. brown. or. and purple. size of eyes. cross. in C.. of A4. slightly. circular. tangular. in other. morphology :. ; and. darkbrown. brown. light-. and. tubes.. and. i.∫present･. example.. longlPeS,. types. modified. chaetae,. in reglOn-A. prostomium,. in C･. 3. reglOn-A. to. ¶1e general. of eyes. at the base. occur. inC.. light brown. 5) 1). 23. in other. as. amber. last type,. be identi丘ed. bodies. on. Characteristics. as. species. this, Paci丘c species could. on. Peter-. what. et. distinguishing. characteristics. By. and C.. Recently. at. ChaetopteI･uS. or. aⅢd internal. --discernible in most. as. the. (Petersen 1997,. chaetae. appendages". digiti-. one. notopodium,. cautus. bristerlike".. listed 30. has short,. "appendagesH,. anterior. of each. talons. dorsal. species. the pos-. on. rami. ajPendl'culatus. form,fluid-filled. new. (rarely8. 12.. Morphology Tbe. The. C.. are. (丑aetoptems notopodia. are. clearly wide. j'aponlcus. 1'zu6nSl's. size of I∋1 notopodia. of Bl. notopodia. bases. in C･. and. are. and. in C.. longlPeS･. slender. nearly cautus,. The. Bl. triangular and. wider. notopodia. of. digitiform (Fig. 10A).. and. crosslandl'is exceeding. usually. unlque. the丘rst. in having. chaetlger. long. Bl. Of reglOn-A. (caullery 1944). 4). A4chaetae, The. A4. (seeFig. 13). colorandmorphology. chaetae. of Cnaetoptems. sp･. is yellow. to. 8). Number. of teeth and. general. size of u∝ini. of. re-.

(24) Eijiroh Nishi. 24. B. glOnS The. of teeth and. number. between. B. reglOnS. ventral lobes. in. (<. small. 50. smallest. uncini. opodia,. although. lobe in. usually. as. okuda. (1935). modified. Izu. west. Peninsula. a. number and. (1904). Crossland it was. not. Kyushu･. C･. Scales,. in C.. or. chaetlger. of cirri. absence. ; they. c∂血∫. C.. in gen-. both. Cirri appear. C.. japonl'cus and and. neuropodia. are. lacks. 1'zuensl's. small. longlPeS cirri. On on. Of reglOn-C･. this. 10). Tube. Tubes. although. Those. useful.. C･. in C. side only,. the posterior. species. of the. ,. of 4 Japanese. chaetae. the dorsal. of. Ⅷerefore,. knobllike. ofmd-. triangular. modified. facilitates identification.. them. and. of region-C. the presence. sides of the neuropodia. uncini. for taxonomy. suitable. considered. fromAmakusa, from. be. among. lobe. each. neur-. and. absence. (lateral)lobe. dorsal. to irregular. rectangular. on. on. Or. p工eSenCe. (lateral)lobes. eral appearance. of the dorsal. The. (Table 1).. 3. suggestedby. A4. in. are. cirri. dorsal. The. the. C. and. is largest. (Table 1).. or. might. B,. of teeth. neuropodia. and. exam-. having. neuropodia,. imentary. neuropodia. species). reglOnS-A,. coⅢstant. genus,. 13･. most. the number. 2. characteristic. Figure. in. examined. within. C in all species. B and. among. is nearly. teeth. and. dorsal. dorsal lobe of region-B pm. of reglOn-B. 2 species. and. between. Region-C. 9). different. are. size of uncini. C,. reglOnS. (Table 1). The. ined is. C. and. Chaetopterus,. 1'zuensl's. n･. SEM from. SP･. composition of. infauna. of epifaunal. photos･. A･. Izu Peninsula･. and. morphology. species species. from. usually. U-shaped･. irregular. U-shaped,. are are. C･. longlPeS. Okinawa.. D･. ChaetopteTUSPaCl'Ii'cus. B･ n･. C･. sp･. cautus. paratype. ,. 100トLm.. I. -■㌃十d･.i㌃豊 i!iii]i ii]. Figure. 14. B, cautus. C.. Length. of each. japonl'cus n. sp. (CMNH-ZW11056). notopodia.. A. after Nishi. ;C, ; et. G, al.. of Pacific. of region-A. notopodium C.. 1'zuensl's. C.. n.. pacl'Hcus. (2000),. n.. B-D,. sp. sp. F. ;D,. C丑aetoptcms. C.. capensl's. (CBM-ZW-325). from. this paper,. A,. C.. gTegaTIus. (average of. (CMNH-ZW-1053) Arrow Efrom. shows Augener. ;E,. longest. 9 type. C･. ｡. notopodium,. (1914)I. All. specimens). mac,opus;F･. are. in. same. do. C･ shortest scale･. ;.

(25) Three. irregularly. partly straight, lS. morphology The. of the. tube. sand. fication. etc,. tube,. species. parch-. for the classi-. useful. I thank. ED GEMENT. staff of Coastal. Katsuura,. Chiba. suggestion. by. brates,. Tokyo. History,. Petersen丘)r fわr providing. M.. This. Sato,. and the M血stry. Culture,. for. is partly. study. Institute of Marine. (RIMI). and. E.. Araiand. samples.. the Research. Sports. M.. draft and. Y.. and. chaetopterid. funded. of Natural. the丘rst. usefu1infTormation, providing. Museum. fortheirhelp, on. Cnaetopterus. or. 1. Inverte-. Day,. J.. (Monbusho),. Japan. No.. H.. 1967.. Augener,. H.. AustTall'a. 1914.. P.. 1953.. ∫. H.. and. Shore. G.. Eldredge,. Bhaud,. Fauna. Pakistan,. by. B.. R.. Press,. M.,. M.. C.. Hartman,. BIshop. and. L.. Museum,. &M.. Universlty. tube. structure. Petersen.. 1994.. soll'taI･Ius. (Rioja, on. comments. and. ophella. Fauna. Pages. Chaetopteridae. 777eAnnell'da,. the. South. ofNew. G.. N.. in shelf. chaetes. S.. Caullery,. R. M.. Siboga.. Crossland, pelago丘om in 1 899.. 1991.. of the. ecosystems. Ophell'a,. A.. 1944.. Polychetes. 1904.. 24,. made. of the. 539-545.. sedentaires. de l､expedition. by. of the Zoologl'cal. polychaetous. Hancock. Foundation,. IJOS. Angeles,. Taxonomy the. Cali-. Supplements. 3,. 1979. New. Estuiaries. of the AustTall'an 11118.. Thepolychaetefauna. South :. ofpolychaetes. Southern. Recovds. Hartman.. Japan.. kyo. 23. Kno光,. :. Wales,. Australia.. 745-796. 1964.. Occasl'onal. The. Papezs,. polychaetous Allan. Hancock. 1-452.. :. On. Chaetoptems. the genus. 4311435,. G.. A.. 8. plate. &. D.. B.. 1957-1963.. suⅣey. Polychaeta.. fromJapanese. (in Japanese) Cameron.. 1971.. Victoria,. Memol'I:S. 7To-. Port. Australia.. Part2,. Museum,. OfNatl'onal. Phillip No.. Vl'ctoI'1'a. 21-42.. Kohn,. A.. ∫. &M.. C.. of Easter. Marenzeller,. E.. Lloyd.. Island.. 58,. 1973.. Intematl'onale. 1879.. E.. 1996.. at. reefs. Dense 1904. Revue. gesamten. 1.. SudjapanischeAnneliden. Akademl'e. aggregation. classe. 41. ,. 1 091 154.. of (丑aetopterus. longlPeS. (Chaetopteridae, Polychaeta). Okinawa,. Japan.. Natwal. De-. dell Wl'ssenschaften.. Mathematl'sch-NatuIWl'ssenschaftll'che Nishi,. Marinepolychaete. 691-712.. dell Kal'sezll'chen. ncshn'ften. Crossland,. 1-204.. TTle POlychaetaofthe. the collections PTOCeedl'ngs. 5,. seas. lndian. Doubutsugaku-zasshl'(Zoologl'calMagazl'ne],. Barbara. far eastern. The. Australia.. IIl'stc)ry 13. 1911.. Santa. ofpoly-. Allahabad:. and. Ralner.. 0.. 26. paTt3,. andbiomass. edited. 1984.. Pittwater,. &. of. HydTObl-ology. Supplement. Sl'boga-Expedl'tl'e C.. M.. Foundatl'on. 4.. &S.. ofNatuTal. annelids. Bay. 36,. I∋ay,. Balballa. Diverslty. in-. Malaya.. Allan. River. Wales,. P.. Santa. California.. of lndia. of the sedentariate. Murray.. vol.. westem. Barbara,. fauna. and. California,. Hawkesbury. annelids. Santa. Atlas. Southern. P. &A.. of the Benthl'c. Basl'n and. of NaturalHistory,. Buzhinskaja,. Malmgren,. In Taxonoml'cAtlas. MaI･Ia. 6,. vol.. Museum. S.. 233-251.. of the Santa. Cnannel.. Family. The. Burma. California.. Of. Hutchings,. 32, 1996.. 656,. fornia.. waters.. E.. Ceylon,. 1969.. from. annelids. Izuka,. (3) : 213-454.. Lastra,. on. M.. status(Polychaeta : Chaetopteridae).. ∫. A.. 1867.. du. p.. D.. Reef. 115-133.. Blake,. U.. (Devaney,. In,. Polychaeta.. Seymour-Sewell.. 0.. Joumal. Sudwest-. Annelida.. Spl'ochaetopterus. notes. with. Phylum. BeTnl'ce 64. of. the generic :. Fauna. Publication. 507pp.. Imajlma,. of Hawaii. Publl'catl'on,. 1917),. Sedentaria.. 1987.. eds.),. Redescription. 40. Polychaeta,. The. cludillg. of Careel. (1), 1-700.. 5. Bailey-B一ock,. Spec)-al. S. I.ondon,. British. 878pp.. Hutchings,. REFERENCE. PolychaetaofSouthernAfrica.. (Natural History).. Museum,. 09740645.. 18-19.. plates. Museum. from. ofSciences,. 25. 270-286,. :. Fauvel,. of the species,. A CKNOWIJ. useful. each. This. membranous,. arealso. species. branched.. or. for distinguishing. useful. composition. ment,. twisted,. new. in coral. IIistc)I'y ReseaI℃h. 4,. 41-47. MaldiveArchi-. ∫. Stanley. Gardiner. Socl'ety ofLDndon. Nishi,. E.. 1997.. Supplementary. ml'tsukuIIIl'Izuka, in Zoological. 1911. Museum. descrlPtlOn. basedlOn. type. of University. OfEupolyodontes materials. Of. Tokyo.. deposited Specl'es.

(26) EijirohNishi. 26. DIvezsl'ty Nishi,. 1,. E.. 10-15.. 1999.. RedescrlPt10n. OfMesochaetoptems. (Polychaeta : Chaetopteridae). golus imens. and. Selangor Nishi,. State,. E.. collected. recently. 2002.. On. Marenzeller.. cautus. socl'ety. from. common. species. 16. Zoology). type. Morib. (1}oceedl'ngsof. Taxa. selan-. on. Pacl'f)'c Scl'ence. the. ofSystematl'c. based. material. Malaysla.. I. spec-. Beach,. 53,. 24136.. (丑aetoptez'us the Japanese. (in press) (in Japa-. Tokyo. Y.. ,. Arai&S.. Bay,. Okuda,･. S.. Journal. central Japan,. 1935.. ofFaculty. Zoology. petersen,.. 4,. M.. E.. What. species. 167,. 513. nzeller,. from. Unl'veml'ty)13,. ofScl'ence,. Hokkal'do. off. its luminescence.. on. from. Chaetoptems. 1984a.. 1-12.. Japanese. Schmarda,. 1997.. scaleworm Grube. from. a. with. ,. L.. K.. 1861.. gesammelt. auf. Vol.. 1.. Anewgenus with. (丑a-. Sea. (An-. commensals. of. commensal the Banda. review. Bulletl'n ofMaI'Ine. of Scl'ence. 60,. 261-276.. NeuewirbelloseThierebeobachlet Reise. einer. Rotatorien. die. um. Erde. 1853. (Leipzig:. Anneliden. und. bis. Sell.. Chaetopteridae) : a at. used. (Renier). vaTIopedatus species. complex.. Bl'ologl'cal Bulletl'n. MBL?. E.. Zoologl'st. (abstract). 62AC to. Contribution. aFPendl'culatus. with. 24,. species". arevision. ofC缶a-. (Polychaeta : Chaetopteridae) = redescrip-. cuvier C.. (Annelida. of the "characteristic. victim. 1997.. comments. W.. on. Grubeand. C.. some. species.. other. cautus. 1855.. MareBulletl'n. DescrlptlOnS. PTOCeedl'ngs. vertebrata.. Tbompson,. 7. M･. L･ the. mographics. of. ceus. the. within. (No.. 10). &L･. C･. 67,. new. in-. marine. hl'stoIy. ofNatural. 3851395.. ,. Schaffner･. 2000･. C缶aetopteI'uS. polychaete. lower. some. Of. of the Academy. Chesapeake. Bay. Bulletl'n. environmentalgradients.. and. LocaldePelgamentarelationships Science. of Man'n6. 209-219.. Uschakov,. P. V. S.. oftheU.. Chaetoptelu"arlopedatus. : another. Stimpson,. to. 1-164.. Engelmann). ofl%'1adelphl'a. waters.. Unl'veI:Slty,. :. being. AmeI･Ican M.. of. notes. with. Natl'onal. E. 1984b.. diseases.. tion. Polychaeta). wilhelm. 87-102.. are. polychaeta). etopterus. Anewspecies. (abstract). M.. Petersen,. 2000.. Chaetopterid. (Annlida :Polychaeta. petersen,. Sasanuma.. (Polychaeta ‥Chaetopteridae). (Yokohama. Actl'nl'a. :. Britayev.. alPendl'culatus. :. und. A.. of polynoid. Chaetopteridae.. (abstract). (2), 619-620. &T.. E.. species. etopteluS. 60. ■. (丑aetop[erus. 6,. and. M.. 1857.. E.. of. Petersen. nelida. nese). Nishi,. Science. ofMan'ne. 1955.. S. R.. Polychaeta. of the far eastern. ZoologlCallnstotute,. Leninglad,. seas. 56,. 1-419pp. Wada,. K.,. M.. Yamanishi, M.. Kato,. T. 氏.. flats in Japan there.. Nishihira,. T.. Nishikawa, Shimamura. and. current. WtWE)Scl'enceRepwts. Furota, S.. & status. T.. Goshima,. H.. Fukuda. of benthic. 3,. 1-175.. Nojima, T.. R.. Suzuki,. 1996. organisms. Mud at. (inJapanese).

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