Nephtys sachalinensis sp. nov. (Annelida: Nephtyidae) - a new species from the shelf of Sakhalin Island (the Sea of Okhotsk)

• Published in: Russian Journal of Marine Biology
• Main Authors: Alalykina, Inna L., Dnestrovskaya, N. Y.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Pleiades Publishing, Springer 2015
• Subjects: Okhotsk; Sakhalin
• Online Access: https://oceanrep.geomar.de/id/eprint/28587/; https://link.springer.com/article/10.1134/S1063074015020029; https://doi.org/10.1134/S1063074015020029

A new species of nephtyid polychaetes Nephtys sachalinensis sp. n. from the upper sublittoral zone (at a depth of 10–107 m) off Northeast Sakhalin, the Sea of Okhotsk, is described. Diagnostic characters of adults are: an everted pharynx with 20 bifid terminal and 2 median simple terminal papillae; single median dorsal and ventral pharyngeal subterminal papillae absent; proximal and median parts of the pharynx are covered with verrucae; branchiae begin from the fourth chaetiger; acicular lobes are distinctly bilobed from the anterior chaetigers almost to the end of the body; each acicular lobe (both in notoand neuropodia) has one rounded outgrowth on its interramal side; subulate notopodial cirri at the median and posterior chaetigers; neuropodial postacicular lobes are no more than two times longer than the acicular lobes. The new species is compared with its related species.