Abstract
Fossils of the terrestrial crab, Geothelphusa tenuimanus , are described. These fossils were collected from clay within the e ssures that rift the limestone of the Middle Pleistocene Ryukyu Formation on Okinawa Island, Ryukyu Islands. The geological age of the fossil G. tenuimanus was estimated as Late Pleistocene, because they occurred in association with a fossil deer ( Cervus sp.), which is already extinct on Okinawa Island. This is the e rst fossil record of a true freshwater crab from the Ryukyu Islands. In both fossil and extant specimens of G. tenuimanus, the longer movable e ngers of the chelipeds usually have a stronger curvature, but the present fossil specimens contain higher numbers of strongly curved movable e ngers than found in extant specimens. This difference may be caused by the fact that no sufe ciently large extant specimens have been examined.
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