Abstract

Th e new species Nesotanais ryukyuensis sp. n. is described from Japan. Nesotanais ryukyuensis most closely resembles N. rugula Bamber, Bird & Angsupanich, 2003, but can be distinguished by the length of simple seta on maxillipedal basis and the shape of cheliped in male. A key to species of the genus Nesotanais is given. Th e male chelipeds of N. rugula are redescribed. Th e serial ridges on the inner surface of the chelipedal propodus and dactylus in Nesotanais ryukyuensis and N. rugula are likely to be stridulating ridges that might produce sound.

Highlights

  • At present, more than 200 genera are recognized as valid in the order Tanaidacea (Anderson 2009)

  • N. ryukyuensis most closely resembles N. rugula, but can be distinguished by the following male characters: 1) the length of ventrodistal simple seta on the maxillipedal basis, 2) outer cuticular ridges on chelipedal carpus, and 3) the shape of the chelipedal flange

  • The females of both species can be separated by the following characters: 1) the length of antenna article 2, and 2) chelipedal carpus

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Summary

Introduction

More than 200 genera are recognized as valid in the order Tanaidacea (Anderson 2009). Cheliped (Fig. 7J, 7j1) basis with broad articulation with cephalothorax via sclerite, slightly longer than wide, with no posterior free portion, and one outer simple seta.

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