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(1)東京湾から記録された日本初記録のチュウゴクフサゴカイ. A new record of Nicolea sinensis Fauvel, 1932 (Annelida: Polychaeta: Terebellidae: Amphitritinae) from the Tokyo Bay, Japan 東京湾から採集された日本初記録のフサゴカイ科多毛類、チュウゴクフサゴカイ Eijiroh NISHI, Maki WAKABAYASHI-KAZAMA, Noriko SUYAMA, Masanori TARU, and Toshio FUROTA E. N. College of Education and Human Sciences, Yokohama National University M. K.-W. IDEA Consultants, Inc. N. S. Doris Japan, Co., ltd. M. T. & T. F. Tokyo Bay Ecosystem Research Center, Toho University Abstract A terebellid polychaete Nicolea sinensis Fauvel, 1932 was first recorded from shallow water off Haneda, Tokyo Bay. It is characterized by having dichotomously branched brancha, 4 pairs of genital papillae on 6 to 9th thoracic setigers, two rows of teeth above main fang of thoracic uncini. Introduction The Terebellidae are abundant and speciose family of often large and conspicuous marine worms (Hutchings, 2000). Around 40 species of the family have been recorded in Japanse waters (Hessle 1917, Okuda 1936, 1937, Imajima & Hartman 1964, Uchida 1992, Tanaka & Nishi 2005, Nishi & Tanaka 2006, 2008). A single species of Nicolea, N. gracilibranchis (Grube, 1878) has been reported in Japanese waters prior to the present study. The species had been collected at the sandy or rocky shore, its tube being found underside rocks. Here we report a new record of Nicolea sinensis, originally described from the East China Sea, from the sandy mud bottoms of Tokyo Bay. Materials and Methods Specimens used for the present study were collected off Haneda Airport and near Tamagawa River, fixed in formalin in the field and preserved in 70% ethanol, catalogued in the Natural History Museum and Institute, Chiba (CBM), Chiba, Japan. Specimens were studied under a Leica WZ 8 and WZ 12 dissecting microscope, and line drawings were made with a camera lucida. Notochaetae and uncinal tori were removed from the trunk of CBM-ZW 1057, dried and mounted on stub, and finally observed under scanning electron microscope (SEM) JSM 5600LV at the Yokohama National University. Results Family Terebellidae Malmgren, 1866 Subfamily Amphitritinae Malmgren, 1866. 11.

(2) 12. 西栄二郎ほか. Genus Nicolea Malmgren, 1866 Nicolea sinensis Fauvel, 1932 (new Japanese name: Chugoku-Fusagokai) Nicolea sinensis Fauvel, 1932: Fauvel, 1932, 537. Material Examined. – CBM-ZW 1055, Stn. L2e, 35.52299881N, 139.7961731E, off Haneda, Tokyo Bay, shallow water, mud bottom, May, 2010. CBM-ZW 1056-1058, same to ZW 1055. CBM-ZW 1059, 1060, Stn. L11c, 35.57116699N, 139.7878265E, off Haneda, Tokyo Bay, shallow water, mud bottom, May 2008. CBM-ZW 1061, Stn. A44c, 35.56973267N, 139.7877502E, off Haneda, Tokyo Bay, shallow water, mud bottom, May 2008. CBM-ZW 1062, 1063, Stn. a11c, 35.55363464N, 139.7992096E, off Haneda, Tokyo Bay, shallow water, mud bottom, May, 2008. CBM-ZW 1064, 1065, 1066, Stn. a44b, 35.56956482N, 139.7872467E, off Haneda, Tokyo Bay, shallow water, mud bottom, May, 2008. CBM-ZW 1067, Stn. a14c, 35.54204941N, 139.8085785E, off Haneda, Tokyo Bay, shallow water, mud bottom, May, 2006. CBM-ZW 1068, Stn. L21-3, 35.53188324N, 139.7942047E, off Haneda, Tokyo Bay, shallow water, 13m, mud bottom, May, 2005. Description. – CBM-ZW 1055, length 30 mm, width 2.0 mm, posterior abdomen lacking, 20 segments in thorax, 7 in abdomen. CBM-ZW 1056 - 1060, length 20 to 40 mm, width 1.5 to 2.0 mm, 20 to 35 segments although almost of all worms lacking posterior abdomen. Alcohol preserved womrs light brown in color. No information in a color in life. Prostomium with compact tentacular membrane, with many eye-spots. Peristomium expanded ventrally to form ventral collar (Fig. 1A). Lateral lobes absent. Two pairs of dichotomous branchiae on segments 2 and 3, inserted dorsally. Anterior and posterior pairs similar in size, but sometimes anterior one slightly larger. Main stalks of branchiae annulated, and poorly developed in distal parts (Fig. 1A, B). Notopodia from segment 4, continuing for 17 segments (up to segment 20). Notopodia rectangular, with notochaetae directing to dorsal side. Notochaetae arranged in two rows, narrow-winged, broad-bladed, smooth-tipped capillaries (Fig. 2A). Neuropodia from segment 5 (chaetiger 2), continuing to pygidium. Thoracic neuropodia elongate tori. Abdominal neuropodia shorter, erect pinnules with uncini, size of tori progressively declining posteriorly. All uncini avicular, short handled, uncini of 7th uncinigerous segemt with dental formula MF:2-3:1-2 (Fig. 2B, C). Abdominal uncini with dental formula MF:2-3:2-3(Fig. 2D). Uncini initially arranged in single rows (Fig. 2B), from 7th uncinigerous segment arranged in double rows (Fig. 2C) to end of thorax and then arranged in single row again on abdomen (Fig. 2D). Dorsum smooth. Ventrum with thoracic ventral pads distinct, rectangular and raised, continued on last segment of thorax (Fig. 1B). A pair of nephridial papilae present on segment 3, small, located on basal side of second branchia. Four pairs of genital papillae present on segments 6, 7, 8 and 9, hemispherical and elongated in males (Fig. 1A), glandular, encircling notochaetae in females (Fig.1C), located dorsally, behind or encircling respective notopodia (Fig. 1A, C). Morphological variation. – Smaller worms has smaller and poorly developed branchial crown. In smaller worms, eye-spots apeared as distinct rows comparing to larger one. Remarks. – Nicolea sinensis had been described from Che-Foo (current name Yantai), located on the.

(3) 東京湾から記録された日本初記録のチュウゴクフサゴカイ. 13. southern coast of the Bohai Sea in China. Fauvel (1932) reported that thoracic uncini in this species had 2 to 3 teeth on main fang (Fig. 1d, p. 35 of Fauvel, 1932), and it was confirmed by SEM observation as in Fig. 2(B D). Fauvel (1932) noted that uncinal rows has doubled from 6th uncinigerous tori; the segment first appearing as double rows of uncini is 7th uncinigerous tori in the Tokyo Bay specimens.. Figure 1. Nicolea sinensis, lateral (A) and ventral (B) view (CBM-ZW 1055). C, lateral view of female (CBM-ZW 1060) thorax. D, posterior thorax and anterior abdomen, 19th to 22th segments of CBM-ZW 1055). Figure 2. Scanning electron micrographs of chaetae and uncini of Nicolea sinensis, CBM-ZW 1057. A, chaetae of 7th thoracic chaetiger. B, uncini of 5th thoracic chaetiger. C, uncini rows of 10th thoracic chaetiger. D, uncini of abdomen. Figure 1. Nicolea sinensis, lateral (A) and ventral (B) view (CBM-ZW 1055). C, lateral view of female (CBM-ZW 1060) thorax. D, posterior thorax and anterior abdomen, 19th to 22th segments of CBM-ZW 1055). Figure 2. Scanning electron micrographs of chaetae and uncini of Nicolea sinensis, CBM-ZW 1057. A, chaetae of 7th thoracic chaetiger. B, uncini of 5th thoracic chaetiger. C, uncini rows of 10th thoracic chaetiger. D, uncini of abdomen..

(4) 14. 西栄二郎ほか. Discussion Eight species of Nicolea have been recorded in the Western Pacific. Nicolea amnis Hutchings and Murray, 1984 has 16 pairs of notopodia and poorly developed dichotomously branchied branchia, Nicolea armilla Hutchings and Smith, 1997 has 18 notopodia, well developed branchied branchiae, small papillae on segment 3, hemispherical elongated papillae on segments 6 and 7; N. minima Hartmann-Schroder, 1984 has 15 notopodia. The newly recorded Nicolea sinensis is different from those species by having 17 notopodia and genital papillae on 6, 7, 8 and 9 segments. Nicolea gracilibranchis (Grube, 1878) has 17 notopodia and papillae on 6th and 7th segments (Tanaka & Nishi 2005). Five species, Nicolea angustiscutis Caullery, 1944, N. longibranchia Caullery, 1944, N. willeyi Caullery, 1944, Nicolea koehleri Caullery, 1944, N. incerta Caullery, 1944, have been recorded by Sigoga Expedition and have 17 notopodia (Caullery, 1944). Among those congeneric species with 17 notopodia, N. sinensis is characterized by having genital papillae on segments 6, 7, 8, and 9, and having two rows of teeth above maing fang of thoracic uncini.. Acknowledgements We thank Committee of environmental asessment for Haneda Airport D-runway extension (D-runway construction) and members of Tokyo Bay Ecosystem Research Center of Toho University for materials and for help in collecting and managing specimens. We also thank Dr. E. K. Kupriyanova for English language review and helpful commnets on the manuscript.. References Caullery, M. 1944. Polychètes Sédentaire de l'Expédition du Siboga: Ariciidae, Spionidae, Chaetopteridae, Chlorhaemidae, Opheliidae, Oweniidae, Sabellariidae, Sternaspidae, Amphictenidae, Ampharetidae, Terebellidae. Siboga-Expeditie Uitkomsten op Zoologisch, Bonatisch, Oceanographisch en Geologisch gebied verzameld in Nederlandsch Oost-Indië 1899-1900 XXIV 2 bis, 1-204. Fauvel, P. 1932. Polychètes nouvelles de Che-Foo (China). Bulletin du Muséum, d’Histoire Naturelle. Paris, Ser. 2, 4(5), 536-538. Grube, A.E. 1878. Annulata Semperiana. Beiträge zur Kenntniss der Annelidenfauna der Philippinen. Memoires de L'Academie Imperiale. des Sciences de St.Petersbourg., Ser. 7, 25(8), 1-300. Hartmannn-Schroder, G. 1984. Zur kenttnis des Eulitorals der australishen Kusten unter besonderer Berucksichtigung der Polychaeten und Ostracoden. Teil 10. Die Polychaeten der antiborealen Sudkuste Australiens (zwischen Albany in Western und Ceduna im Osten). Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, band 81, s. 7-62..

(5) 東京湾から記録された日本初記録のチュウゴクフサゴカイ. 15. Hessle, C. 1917. Zur Kenntnis der terebellomorphen Polychaeten. Zoologiska Bidrag från Uppsala, 5, 39-258. Hutchings, P. A. 2000. Family Terebellidae. Pp. 226-232 in Beesley, P. L., Ross, G. J. B., & Glasby, C. . (eds.), Polychaetes and Allies: The Southern Synthesis. Fauna of Australia. Vol. 4A Polychaeta, Myzostomida, Pogonophora, Echiura, Sipuncula. CSIRO Publishing: Melbourne xii 465pp. Hutchings, P. A. and Murray, A. 1984. Taxonomy of polychaetes from the Hawkesbury River and the southern estuaries of New South Wales, Australia. Records of the Australian Museum, 36, 1-119. Hutchings, P. and R. I. Smith. 1997. Descriptions of new species and comments on previously described species of terebellid polychaetes from New Zealand and Australia. Bulletin of Marine Science, 60(2), 324-349. Imajima, M. & O. Hartman. 1964. The Polychaetous Annelids of Japan. Occassional Papers, Allan Hancock Foundation, 26, 1-452. Malmgren, A. J., 1866. Nordiska Hafs-Annulater. Öfversigt af Königlich Vetenskapsakademiens förhandlingar. Stockholm, 22(5), 355- 410, plates 18 - 29. Nishi, E. & K. Tanaka, 2006. Records of two species of Terebellid polychaetes in Shizugawa Bay, Sanriku Coast. Nankiseibutu, The Nanki Biological Society, 48(1), 36-38. (in Japanese with English abstract) Nishi, E. & K. Tanaka. 2008. Records of Pista elongata from the Shizugawa Bay, Sanriku Coast, and P. shizugawaensis from the Hakata Bay, Kyushu (Annelida: Polychaeta: Terebelidae). Nankiseibutu, The Nanki Biological Society, 50(1), 82-84. (in Japanese with English abstract) Okuda, 1936. Polychaetous annelids from Toyama Bay and its adjacent waters. I. Polychaeta Sedentaria. Bulletin of the Biogeographical Society of Japan, 6, 147-157. Okuda, S.1937. Annelida Polychaeta in Onagawa Bay and its vicinity. I. Polychaeta Sedentaria. Scientific Reports, Tohoku Imperial University, series 4, 12, 45-69. Tanaka, K. & E. Nishi. 2005. Records of four species of Terebellid polychaetes in Shizugawa Bay, Sanriku Coast. Nankiseibutu, The Nanki Biological Society, 47(2), 141-144. (in Japanese with English summary) Uchida, H. 1992. Polychaeta. In Encyclopedia of Marine Invertebrates I., ed. By S. Nishimura, Pp. 310-373, Hoikusha, Osaka, Japan. (in Japanese).

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