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 Sayamia Naiyanetr, 1994 Type species. Somanniathelphusa bangkokensis Naiyanetr, 1982 . Remarks. Naiyanetr (1994) established Sayamia for several large gecarcinucid species which had previously been placed in Somanniathelphusa Bott, 1968 . Five species are currently recognised in Sayamia , and the genus has a wide distribution in Thailand , Indochina, southern Thailand and northern Peninsular Malaysia .