Revision of the Oriental and Australasian diving beetle genus Sharp, 1882 (Coleoptera, Dytiscidae, Dytiscinae).

A comprehensive revision is presented of the Oriental and Australasian diving beetle genus Sharp, 1882 (Coleoptera: Dytiscidae: Dytiscinae: Aciliini) and seven junior subjective synonyms are proposed. Balfour-Browne, 1939, is a junior subjective synonym of Heller, 1934; Vazirani, 1969, of (Crotch, 1872); Blanchard, 1843, of (Aubé, 1838); and Heller, 1934, , Sharp, 1882, , and Satô, 1978, of (Wehncke, 1876). Finally, Anand et al., 2021, is a new synonym of (Aubé, 1838). New status is assigned to (Sharp, 1882), as well as (Crotch, 1872), Lectotypes are designated for the following taxa: Guérin-Méneville, 1830, Aubé, 1838, Wehncke, 1876, Régimbart, 1899, Régimbart, 1899, and Sharp, 1882. A neotype is designated for Wehncke, 1876. In total, three Oriental species, two of which also occur in the East Palaearctic, six Southeast Asian species, one species from New Guinea and the Moluccas, and one from Australia with an endemic subspecies in Central Australia () are recognised. Each taxon is presented with a diagnosis, habitat preferences, conservation assessments, distribution data, and a comprehensive bibliography. Important characters (habitus, dorsal colouration, median lobes and parameres) are illustrated. All currently valid taxa are redescribed. Wewalka & Vazirani, 1975 from Sri Lanka, from Borneo, from the Philippines and Sharp, 1882 from Sulawesi are recommended to be listed in the next IUCN red data book. A key to all species is provided.