Martensina thailandica gen. et sp. nov., a freshwater ostracod species representing new subfamily, Martensininae subfam. in the family Cyprididae, is here described from swamp Maha Sarakham Province, Thailand. The genus and mainly characterized by 7-segmented antennula which has Rome organ remarkably long aesthetasc ya, morphology of sexually dimorphic antenna (A2), markedly elongated A2 termin...