A new species, PlatygasterharpagocerasPopovici & Veenakumari, is described from India. The most unusual features of this species are the acuminate shape of the last antennomere and the 9-merous antenna in both sexes. The male and female are described and illustrated with brightfield and scanning electron microscopy. We provide a comparative analysis of the acuminate distal antennomere in the superfamily Chalcidoidea, including several genera of Pteromalidae ( CallitulaSpinola, HomoporusThomson, NorbanusWalker, RhaphitelusWalker).