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Reexamination of the Diagnostic Characters of Two Freshwater Palaemonid Prawns, Macrobrachium Nipponense (De Haan, 1849) and M. Formosense Bate, 1868 (Decapoda, Caridea) From Japan

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Diagnostic characters which identify a species through all developmental stages and for both sexes are needed for field studies on their population ecology and/or biogeography. The identification of young and female specimens of Macrobrachium nipponense and M. formosense has been difficult. Here we reexamine the rostrum, pereopods, and telson of these species, and discuss the suitability of these characters for their identification. It is here shown that the proportion of the dactyl of pereopod 3, and the shape of pereopod 2 and the rostrum, are the best diagnostic characters for distinguishing all phases and both sexes of these two species.

Affiliations: 1: Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima 890, Japan

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