Abstract
Abstract The Holocene fossil crab genus Arges De Haan, 1833, is here shown to be a senior subjective synonym of the pilumnid crab Typhlocarcinops Rathbun, 1909. Both genera possess the diagnostic character of an extremely wide first male pleonal somite that reaches across the wide thoracic sternum to the base of the coxae of the fourth pair of ambulatory legs. Arges parallelus (De Haan, 1833), is also here regarded as a senior subjective synonym of Typhlocarcinops decrescens Rathbun, 1904, a species known from Japan, China, Hong Kong, the Philippines and Indonesian Papua.
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