A revision of East Asian Acanthomysis (Crustacea: Mysida: Mysidae) and redefinition of Orientomysis, with description of a new species

• Published in: Journal of natural history Vol. 39; no. 9; pp. 657 - 709
• Main Authors: Fukuoka, Kouki, Murano, Masaaki
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.03.2005
• Subjects: Acanthomysis; Crustacea; East Asia; Marine; Mysida; Mysidae; Orientomysis; Orientomysis arenaria; taxonomy; INW, Japan
• ISSN: 0022-2933; 1464-5262
• DOI: 10.1080/00222930400001418

Twenty species of Acanthomysis s. l., distributed in Japanese, Korean and Chinese coastal waters, are revised. These species are distinguished from Acanthomysis s. str. by the following characters: the carpopropodus of the endopod of the third to eighth thoracic limbs divided into three to eight subsegments; the exopod of the fourth male pleopod with two long subequal terminal setae; the telson long linguiform or triangular without basal dilated portion and armed with spines throughout margins. On the basis of these characters, the genus Orientomysis, which was revived by Holmquist ( 1981b ) and comprised O. japonica and O. mitsukurii, is redefined and recognized to contain the following 18 valid species: O. aokii, O. aspera, O. crassispinosa, O. fujinagai, O. hwanhaiensis, O. koreana, O. leptura, O. meridionalis, O. okayamaensis, O. pseudomitsukurii, O. robusta, O. rotundicauda, O. sagamiensis, O. serrata, O. sheni, O. tamurai, O. tenella, and O. tenuicauda. Acanthomysis longicauda and A. nakazatoi are synonymized with O. rotundicauda and O. japonica, respectively. A new species, O. arenaria, is described from Japan.