Abstract
Abstract The Ephemeridae of the Asiatic area are treated with particular emphasis given to those of the Oriental Region. A reevaluation and illustrated synopsis of the genus Eatonigenia Ulmer are presented, including the description of the nymphal stage of the genus for the first time. E. chaperi (Navas) is described from Thailand, and two new species, E. trirama, and E. seca are described from India and Thailand respectively. The previous Hexagenia indica Chopra is newly placed as E. indica (Chopra) comb. nov. Inferred relationships of all Asiatic ephemerid genera are discussed in terms of phyletic and zoogeographic affinities. The actual occurrence of Hexagenia Walsh in the area appears highly doubtful.
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