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A New Species of the Genus Pseudomysidetes (Mysidacea) From Japan and Reallocation of This Genus To the Heteromysini

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A new species of Mysidacea, Pseudomysidetes japonicus, is described. The present new species is clearly distinguishable from the other two species of the genus, P. russelli W. M. Tattersall, 1951 and P. cochinensis Panampunnayil, 1977, in the size of the antennal scale, the number of subsegments in the carpopropodus of the 3rd-8th thoracopod endopods, the length of the penis, the shape of the telson, and the number of spines on the endopod of the uropod. P. japonicus represents the first record of this genus in Japan. On the basis of the rudimentary pleopods in both sexes and the length of the penis in the male, Pseudomysidetes is transferred from the tribe Leptomysini to the tribe Heteromysini. An update of the taxonomic key to genera and subgenera of the Heteromysini is suggested.

Affiliations: 1: Department of Aquatic Biosciences, Tokyo University of Fisheries, 4-5-7 Konan, Minato-ku, Tokyo 108, Japan


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