A survey of the ostracod fauna in the Chi River Basin in three provinces (Maha Sarakham, Kalasin and Roi Et) of northeast Thailand uncovered three new species of the tribe Cyprettadopsini of the Cypridopsinae: Cyprettadopsis hanjavanitae sp. nov., C. kalasinensis sp. nov. and Pseudocypretta sangpradubae sp. nov. Apart from its different soft part morphology, P. sangpradubae sp. nov. can be obviously distinguished from other Pseudocypretta by the valve ornamentation with strong pits and densely a
