Historical notes on various collectors of unidentified freshwater crabs (Crustacea: Decapoda: Brachyura) from the Malay Peninsula and Borneo, with descriptions of two new species of Isolapotamon Bott, 1968 Potamidae) Author Ng, Peter K. L. Author , Martyn E. Y. Low Author Clark, Author Paul F. text Raffles Bulletin of Zoology 2022 2022-12-12 70 550 571 journal article 10.26107/RBZ-2022-0031 2345-7600 13256876 633217F0-3D8F-478B-B300-5AABADEB3066 Genus Parathelphusa H. Milne Edwards, 1853 Type species. Parathelphusa tridentata H. Milne Edwards, 1853 . Remarks. This large genus of 49 recognised species ( Ng et al., 2008 , 2016; Ng, 2014; De Grave et al., 2022 ) is recorded from southern Thailand to Sumatra, Peninsular Malaysia , Java, Borneo, Sulawesi, as well as Palawan and some adjacent islands in the Philippines . Borneo is not the centre of distribution with just 10 species, but is believed to be the origin of the remaining taxa (cf. Klaus et al., 2013 ).