The subfamily Aphyssurinae, herein established, comprises only the precinctively Australian genus Aphyssura Hardy. These flies are all small (overall length up to ca. 5 mm) and of fairly uniform structure. The subfamily and genus are characterised as follows: the long arista is sparsely plumose on the basal quarter of its third segment, and thence spiculate to the apex; the prosternum is sparsely bristled; some bristles (anterior presutural intraalar, immediately presutural intraalar, lateral scutellars and intrapostalar) are lacking; cell r 4+5 is closed or even has a short appendix; the calypteres are bare; the males have a relatively narrow frons, an uncleft fifth sternite armed with a down-turned subapical spine; the cerci are completely fused. The females often completely different from the males in coloration, and the dorsal sclerites of the ovipositor are greatly reduced; reproduction is by larviparity. The previously described species – A. minuta (Malloch), A. dubia (Walker) and A. pusilla (Macquart) – are characterised. The following new species are described: A. arenicola , A. attonita , A. banksi , A. contexta , A. crassigaster , A. cygnea , A. eyrei , A. halli , A. humei , A. ioannes , A. liepae , A. mongensis , A. narrogina , A. nigricans , A. rubida , A. rustica , A. southcotti , A. sturti , A. tanni , A. territorialis , A. therribriana , A. tonnoiri , A. ungarrana , and A. zentae . A key to species is given. Illustrations of diagnostic features of the male and female terminalia are given.
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K. R. Norris (1999) studied this question.