BIOLOGIYA MORYA, 2015, Vol. 41, No. 2, pp. 130-137

Nephtys sachalinensis sp. n. (Annelida: Nephtyidae): a new species from the upper sublittoral of northeastern Sakhalin Island, the Sea of Okhotsk

© 2015 I. L. Alalykina^1,2, N. Yu. Dnestrovskaya³

¹A.V. Zhirmunsky Institute of Marine Biology, Far East Branch, Russian Academy of Sciences, Vladivostok 690041;
²Far Eastern Federal University, School of Natural Sciences, Vladivostok 690091;
³Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow 119234

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A new species of nephtyid polychaetes Nephtys sachalinensis sp. n. from the upper sublittoral (the depth 10-107 m) of northeastern Sakhalin, the Sea of Okhotsk, is described. Diagnostic characters of adults are as follows: everted pharynx with 20 bifid and 2 simple terminal papillae; dorsal and ventral pharyngeal subterminal papillae not isolated; proximal and median part of the pharynx covered with verrucae; branchiae begin on the fourth chaetiger; acicular lobes distinctly bilobed from anterior chaetigers almost to the end of the body; each acicular lobe (both in noto- and neuropodia) has one rounded outgrowth on its interramal side; subulate notopodial cirri on the median and posterior chaetigers; neuropodial postacicular lobes no more than two times longer than the acicular lobes. The new species is compared with its close species.

Key words: Polychaeta, Nephtyidae, sublittoral, northeast Sakhalin, Sea of Okhotsk, North Pacific.