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A Revision of the Species of the Genus Dichaeta Meigen (Diptera: Ephydridae)

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The species of the genus Dichaeta Meigen are revised, including a phylogenetic analysis of the five recognized species. Two new species are described (type locality in parenthesis): D. wirthi (New Jersey. Ocean: Forked River (39°50.1'N, 74°11.8'W)) and D. zacki (Idaho. Boundary: Perkins Lake (48°45.4'N, 116°05.5'W)). The identity of N. transversa Walker, which had been a nomen dubium, is established and is discovered to be conspecific with D. ussurica Krivosheina, the latter thus being a junior synonym. Dichaeta choui Fan, described from specimens collected in China, is recognized as a junior synonym of D. caudata. In the phylogenetic analysis, the tribe Notiphilini is found to be a well-established, well-corroborated, monophyletic lineage comprising two genera, Dichaeta and Notiphila Fallén. Dichaeta is found to be the sister group to Notiphila sensu lato and is accorded generic status, which is a reversion to its former placement when first described. All known species are described with an emphasis on structures of the male terminalia, which are fully illustrated. Detailed locality data and distribution maps for the Nearctic Region are provided. A lectotype is designated for Notiphila transversa Walker.
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Keywords: DICHAETA; EPHYDRIDAE; NOTIPHILINI; PHYLOGENY; SHORE FLIES

Document Type: Research Article

Publication date: 01 December 2007

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