Potamoid Crabs of the Ryukyu Islands? with Desrciptions of Five New Species (Crustacea, Decapoda, Potamoidea)

The Potamoidea of the Ryukyu Islands are reported to include 12 species divided in three genera. Of these five are newly described: Geothelphusa aramotoi sp. nov., Candidiopotamon amamense sp. nov., Candidiopotamon okinawense sp. nov., Candidiopotamon kumejimense sp. nov. and Nanhaipotamon yaeyamense sp. nov. Newly recorded from the area are two species which have been known from Taiwan only : Geothelphusa candidiensis Bott and Geothelphusa miyazakii (Miyake & Chiu)