A revision of the southeast Asian freshwater crabs of the genus Isolapotamon Bott, 1968 (Crustacea: Decapoda: Brachyura: Potamidae)

Abstract

The taxonomy of the potamid freshwater crab genus Isolapotamon Bott, 1968, is revised. Fifteen Bornean species (including two new ones) and three Philippine species are recognized. The fifteen Bornean species are: J. anomalwn (Chace, 1938) (type species), J. bauense Ng, 1987,1. beeliae Ng, 1986,1. borneense, new species, I. collinsi Holthuis, 1979, J. consobrimim (De Man 1899), J. doriae (Nobili 1900), J. griswoldi (Chace, 1938), J. griisophallus Ng & Yang, 1986, J. ingeri, new species, J. kinabaluense (Rathbun, 1904), 7. mahakkamense (De Man, 1899), 7. naiadis Ng, 1986, 7. nimboni Ng, 1987, and 7. stuebingi Ng, 1995. The three Philippine species are: 7. mindanaoense (Rathbun, 1904), 7. sinnatifrons (H. Milne Edwards, 1853) and 7. spatha Ng & Takeda, 1992. These species are distinguished mainly by means of their gonopodal and carapace features.