The Genus Microvelia Westwood In Australia (Hemiptera : Heteroptera : Veliidae)

Water striders and their allies ( Hemiptera, Gerromorpha) are familiar inhabitants of water surfaces throughout the world. One of the most species-rich groups is the subfamily Microveliinae (Veliidae) and, in particular, the genus Microvelia Westwood, 1834. This genus comprises small or very small bugs inhabiting the nearshore areas of stagnant or slow-flowing fresh water. Accumulation of material during the past 30 years has shown that the Australian fauna of Microvelia is much richer and more diverse than previously recognised. In the present paper we discuss the subgeneric classification of the genus Microvelia based on the results of a phylogenetic analysis using maximum parsimony, describe three new subgenera and redescribe all previously known Australian species of the genus. The new taxa are: Microvelia (Austromicrovelia), subgen. nov. ( type species: Microvelia mjobergi Hale, 1925) with the species Microvelia ( Austromicrovelia) spurgeon, M. hypipamee, M. margaretae, M. monteithi, M. tuberculata, M. myorensis, M. woodwardi, M. carnarvon, M. annemarieae, M. mossman, spp. nov. ( all from Queensland), M. eborensis and M. milleri, spp. nov. ( New South Wales), M. queenslandiae, M. ventrospinosa, spp. nov. ( New South Wales, Queensland), M. angelesi, M. alisonae, M. odontogaster, spp. nov. ( Northern Territory), M. apunctata, sp. nov. ( Northern Territory, Queensland), M. pennicilla, sp. nov. ( Northern Territory, Western Australia), M. herberti, M. malipatili, M. torresiana, and M. australiensis, spp. nov. ( Northern Territory, Queensland, Western Australia), Microvelia ( Barbivelia), subgen. nov. ( type species: Microvelia barbifer, sp. nov.) with the species Microvelia ( Barbivelia) barbifer, sp. nov. ( Queensland) and M. falcifer, sp. nov. ( Northern Territory); Microvelia ( Pacificovelia), subgen. nov. ( type species: Microvelia oceanica Distant, 1914) with the species M. tasmaniensis, sp. nov. ( Tasmania), M. lilliput, and M. kakadu, spp. nov. ( Northern Territory, Queensland, Western Australia). We further recognise the subgenus Microvelia ( Picaultia), stat. nov. ( type species: Picaultia pronotalis Distant, 1913), and describe the following new species: Microvelia ( Picaultia) justi and M. paramega, spp. nov. ( Northern Territory, Queensland, Western Australia), and M. cassisi, sp. nov. ( New South Wales). Finally, Microvelia fluvialis weiri Malipatil, 1980, is synonymised with Microvelia fluvialis Malipatil, 1980. Keys to adults of all species are provided and their distributions mapped.