Deep-sea Fauna and Pollutants off Pacifi c Coast of Northern Japan, edited by T. Fujita, National Museum of Nature and Science Monographs, No. 39, pp. 39‒192, 2009 Deep-sea Benthic Polychaetes off Pacifi c Coast of the Northern Honshu, Japan Minoru Imajima Department of Zoology, National Museum of Nature and Science, 3̶23̶1 Hyakunin-cho, Shinjuku-ku, Tokyo, 169̶0073 Japan E-mail:
[email protected] Abstract: Polychaetous annelids of the deep-sea off Pacifi c coast of the northern Honshu through the research project conducted during 2005̶2007 by the National Museum of Nature and Science, Tokyo, were taxonomi- cally examined. A total of 211 identifi ed species and 32 indeterminable species in 43 families of polychaetes are recognized. Fourteen species are new to science: Weberia abyssicola (Polynoidae), Sigalion orientalis (Sigalionidae), Glycera neorobusta, Glycera okai and Glycera semibranchiopoda (Glyceridae), Nereis abyssa and Rullierinereis profunda (Nereididae), Euphrosine digitalis and Euphrosine pseudonotialis (Euphrosini- dae), Paradiopatra gracilis (Onuphidae), Naineris japonica (Orbiniidae), Laubieriopsis brevis japonica (Fau- veliopsidae), Pseudoscalibregma orientalis (Scalibregmatidae) and Anobothrus wakatakamaruae (Am- pharetidae). Thirty-seven species are newly added to the Japanese polychaetous fauna. Eighty-six species are known also from the northwestern Pacifi c Ocean, including Sea of Okhotsk and Bering Sea. Forty species are known only from Japan, or endemic. The Fauveliopsidae is newly added to the Japanese fauna. Key words: Off northern Honshu, deep-sea, polychaetes, new species, taxonomy. Introduction The deep-sea research project “Study on Deep-Sea Fauna and Conservation of Deep-Sea Ecosystem” was conducted during the period 2005̶2007 off Pacifi c coast of the northern Honshu by the National Museum of Nature and Science, Tokyo.