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Two New Species of the Genus Paramoera (Amphipoda, Gammaridea) From Hokkaido, Northern Japan, With Special Reference To Their Strangely Transformed Second Pleopod

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Two new species of Paramoera (Amphipoda, Gammaridea) are described from Hokkaido, northern Japan : P. koysama sp. nov. is characterized by the spines on the peduncular articles 3 and 4 of antenna 2 and the modified outer ramus of the male pleopod 2; P. erimoensis sp. nov. is distinguished by numerous spines on the concave article 5 of the male pereiopod 7 and the strangely transformed outer ramus of the male pleopod 2. Modification of the outer ramus of the male pleopod 2 is reported for the first time in this genus. Particularly, the structure of pleopodal setae in P. erimoensis sp. nov. is quite unique in the Amphipoda. Ecological information suggests that P. koysama has a diadromous life cycle.

Affiliations: 1: ) Department of Systematic Zoology, Division of Environmental Structure, Graduate School of Environmental Science, Hokkaido University, Sapporo 060, Japan; 2: ) Systematics and Evolution, Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060, Japan


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