Abai, MR

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6th International Congress of Dipterologydetailed analyses of their phylogenetic relationships using bothmorphological and molecular characters – focusing particularly on the timeof differentiation of the counterparts of the disjunct distribution.Key Words: biogeography, Asio-Nearctic disjunct distribution, Arcto-Tertiary flora, Diptera∗∗∗∗∗∗∗∗∗∗210
6th International Congress of DipterologyTorrenticolous Empididae from northern ArgentinePatagoniaSaigusa, T.Baikoen 2-1-7-402, Chuo-ku, Fukuoka-shi, 810-0035, Japanemail: toyohei_saigusa@yahoo.co.jp.Through a recent field survey of torrenticolous empidids in northernArgentine Patagonia, eight species representing five genera, three knownand two undescribed, were found. The monotypic genus Dipsomyia Bezziis represented by an undescribed species that differs from the type species,Dipsomyia spinifera Collin known only from Chile, by yellow mesonotalbristles and more symmetrical fork of R4 and R5. Two males ofProagomyia torrentium Collin were found near its type locality.Asymphyloptera hitherto unknown from Patagonia is represented by anundescribed species that has a unique combination of four scutellars,incomplete fringe along posterior margin of basal area of wing and thepresence of humeral crossvein, and belongs to neither the New Worldgroup nor the Australian group (Sinclair, 1995). An undescribed genuscontaining 4 moderately large undescribed species is similar to Dipsomyia,and has bare compound eyes, elongated, stout and recurved proboscisbearing setal brushes on apical portion of epipharynx, porrect maxillarypalpi, setose laterotergites and broadly flattened 5th tarsomereslaterodistally produced into short processes. The genus appears to be amember of the Ragas-group (Sinclair, 1999), and it is extremely diversifiedin male genitalia, female terminalia and wing shape, vestiture andmarkings. They feed on small insects on wet stones in mountain brooks.The other undescribed genus somewhat similar to the former contains asmall undescribed species characterized by flagellomeres incorporated intoan elongate segment with tiny apical seta or style, drooping maxillary palpiand simple 5th tarsomeres.Key Words: torrenticolous Empididae, Ragas-group, Asymphyloptera,Dipsomyia, Argentine Patagonia211
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Abai, MR

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