Description of a new species of Heterocypris Claus, 1892 (Crustacea: Ostracoda: Cyprididae) from Thailand

Heterocypris sarakhamensis, new species, is described from a temporary pond in Maha Sarakham Province in the Northeastern part of Thailand. The new species resembles Heterocypris indica (Battish, 1981). The following are the main indicative features of the new species: the subelliptical carapace in dorsal view without anterior compression, posterior half of the right valve dorsal margin with inward arch resulting in a thick margin aspect, the evenly arch dorsal margin of the left valve without angulated corner, the serrated bristles on the third endite of the maxillula, the short d1 seta on the second thoracopod, and the long Ga claw of the caudal ramus. Heterocypris sarakhamensis, new species, is the first record of the identified Heterocypris species in Thailand and it is the third Heterocypris species in Southeast Asia.