Fredius is a genus of crabs in the family Pseudothelphusidae, containing the following species: \n* Fredius adpressus Rodríguez & Periera, 1992 \n* Fredius beccarii (Coifmann, 1939) \n* Fredius chaffanjoni (Rathbun, 1905) \n* Fredius convexa (Rathbun, 1898) \n* Fredius denticulatus (H. Milne-Edwards, 1853) \n* Fredius estevisi (Rodríguez, 1966) \n* Fredius fittkaui (Bott, 1967) \n* Fredius granulatus Rodríguez & Campos, 1998 \n* Fredius platyacanthus Rodríguez & Pereira, 1992 \n* Fredius reflexifrons (Ortmann, 1897) \n* Fredius stenolobus Rodríguez & Suárez, 1994 \n* Fredius ykaa Magalhães, 2009