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New species of the genus Oxyonchus (Enoplida: Thoracostomopsidae) from the Far Eastern Seas

Published online by Cambridge University Press:  09 December 2011

Natalia P. Fadeeva ,
Vladimir V. Mordukhovich  and
Julia K. Zograf
Natalia P. Fadeeva
Affiliation:
Far Eastern Federal University, 27 Oktyabrskaya St., Vladivostok, 690600, Russia
Vladimir V. Mordukhovich
Affiliation:
Far Eastern Federal University, 27 Oktyabrskaya St., Vladivostok, 690600, Russia
Julia K. Zograf*
Affiliation:
Far Eastern Federal University, 27 Oktyabrskaya St., Vladivostok, 690600, Russia A.V. Zhirmunsky Institute of Marine Biology FEB RAS, 17 Paltchevsky St., Vladivostok, 690041, Russia
*
Correspondence should be addressed to: J.K. Zograf, Far Eastern Federal University, 27 Oktyabrskaya St., Vladivostok, 690600, Russia email: zojulia@yandex.ru
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Abstract

Three species: Oxyonchus orientalis sp. nov., O. sakchalinensis sp. nov., and O. nicholasi sp. nov. (Thoracostomopsidae: Nematoda) are described and illustrated with the aid of light microscopy and laser-scanning microscopy pictures from sediments of Far Eastern Seas (the one former species from the Sea of Japan, Eastern Russia and the two latter species from the Sea of Okhotsk, Sakhalin Island). Generic diagnosis is emended for identification of Oxyonchus. Oxyonchus orientalis sp. nov. has short cephalic sensillae (0.6 cephalic diameters), strongly developed broad mandibular plate with irregular arrangement of numerous small denticles. Oxyonchus sakhalinensis sp. nov. is particularly characterized by the weakly short cephalic capsule, and the rounded thin mandibular plates with 10 denticles. Oxyonchus nicholasi sp. nov. can be differentiated by the structure of the cephalic armament (well developed capsule, fenestrae and incisions), numerous long cervical setae and tail shape. The distribution patterns of the various Oxyonchus species was suggested.

Keywords

confocal microscopydescriptionOxyonchus orientalis sp. nov.O. sakhalinensis sp. nov.O. nicholasi sp. nov.laser-scanning microscopytaxonomygeographical distribution
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 5 , August 2012 , pp. 947 - 957
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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