Oncholaimus langhovdensis sp. nov. (Nematoda: Enoplea: Oncholaimida), a New Species of Free-living Marine Nematode from Langhovde, Dronning Maud Land, East Antarctica

Daisuke Shimada; Atsushi C. Suzuki; Megumu Tsujimoto; Satoshi Imura; Keiichi Kakui

doi:10.12782/specdiv.22.151

Abstract

A new species of free-living marine nematode, Oncholaimus langhovdensis sp. nov., is described from the intertidal zone of Langhovde (near Syowa Station), Dronning Maud Land, East Antarctica. It closely resembles 11 congeners in the conico-cylindrical tail shape present in males and amphid and excretory pore positions, short spicules, and Demanian system structure present in females. However, it mainly differs from these congeners in body size, de Man's ratios, tail length and shape, and Demanian system structure present in females. Oncholaimus langhovdensis sp. nov. also resembles four congeners known only by females, but it can be distinguished from them based on the tail length and uvette position. In addition to O. langhovdensis sp. nov., two undescribed species (Tripyloididae gen. sp. and Axonolaimidae gen. sp.) and four unidentified species (Sphaerolaimus sp., Oncholaimidae gen. sp., Comesomatidae gen. sp., and Chromadorida fam. gen. sp.) were found from the same locality.

DOI: http://dx.doi.org/10.12782/specdiv.22.151

Received 13 6月 2017 Accepted 13 9月 2017

Acknowledgments:

We wish to thank Mr. Jun Hirano (Ministry of the Environment), Mr. Ryo Fujiwara (the University of Tokyo), and Mr. Akihiro Suyama (the University of Tokyo) for their assistance in sampling, Dr. Hiroshi Kajihara (Hokkaido University) for providing the facilities for microscopic observation and molecular work, and Mr. Akiho Shibata (Hokkaido University) for helping in molecular experiments. We also thank all members of JARE 56 and the captain and crew of the icebreaker Shirase II for their support. This study is an outcome of a National Institute of Polar Research (NIPR) workshop held on November 31 and December 1, 2015. This study was supported in part by a grant to the first author from the Keio Gijuku Academic Development Funds.

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