Altogether 11 geographic populations of Drosophila kikkawai were analysed from the viewpoint of karyotypic variation, inversion polymorphism and sexual isolation. The results revealed that of all the populations, the New Guinea population was the most genetically diverged, characterized by its distinct karyotype, possession of a fixed inversion, and its females exhibiting sexual isolation at the level of preferential mating. Based on these findings it was inferred that incipient speciation has proceeded in D. kikkawai and its New Guinea population is on its way to speciation.
The subgenus Scaptodrosophila of the genus Drosophila from India is revised, with the description of six new species, D. elenthiensis sp.n., D. ovidenticulata sp.n., D. oviminiatus sp.n., D. paraclubata sp.n., D. paratriangulifer sp.n., D. peniquadrata sp.n., and a new distribution record of D. pressobrunnea Tsacas & Chassagnard. A key to Indian species of Scaptodrosophila is also provided.
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