A new, widespread genus of Baetidae from South Asia (Insecta, Ephemeroptera).

Material collected on different islands across South Asia revealed a new genus of Baetidae with a widespread distribution, The larvae present important similarities with , but have paraglossae dorsally with an arc of long, spine-like setae in distal area; long, slightly feathered setae between prostheca and mola of both mandibles; and very slender legs with row of short setae at dorsal margin of femur. The male imago has an extraordinarily small 3 (apical) segment of gonostylus, which is much narrower than the apex of the 2 segment. The new genus includes five species: is described from Sumbawa (Indonesia) based on larvae, from Sumatra (Indonesia) based on larvae, from Borneo (Brunei) based on larvae, and (type species) is described from Sri Lanka based on a reared male imago with its larval and subimaginal exuviae; (Chang & Yang, 1994), from Taiwan, formerly described in Margobaetis Kang & Yang, 1994, a subgenus of Baetis Leach, 1815, and subsequently transferred to the genus Kazlauskas (in Novikova & Kluge), 1987, is transferred to the new genus. A key to the larvae of all species is provided. Morphological similarities and the relationship of the new genus to other genera of Baetidae are discussed.