Oxyceroides, Yang, Zai-Hua, Rozkošný, Rudolf & Ya, Mao-Fa, 2015

Yang, Zai-Hua, Rozkošný, Rudolf & Ya, Mao-Fa, 2015, A new genus and three new species of tribe Oxycerini (Diptera: Stratiomyidae) from Oriental region, Zootaxa 4057 (1) : -

Oxyceroides gen. nov.

( Figs 1–36 )

Type species: Oxyceroides gracilis sp. nov. by present designation.

Diagnosis. This genus can be separated from the other Oriental Stratiomyinae by the following combination of characters: the antennae is longer than the head in profile, the antennal flagellum consists of 6 cylindrical flagellomeres, the scutellum is provided with a pair of slender spines, vein R2+3 originating beyond crossvein r-m and vein R4 is missing as well as crossvein m-cu. The abdomen is very slender, and often almost cylindrical in males and more flat but usually not broader than the thorax in females.

Description. Male ( Figs 1–2 , 5, 16, 26). Head (Figs 3, 14, 27) dark brown to black, large eyes occupying most of anterior and lateral head surface; eyes bare and contiguous. Ocellar tubercle shining black, bare, distinctly prominent. Upper frons reduced to a small triangle; lower frons subtriangular, with an inconspicuous longitudinal median groove; lower frons and face not produced, postocular area not visible in lateral view. Antennae close together at base, longer than head, scape about 1.5 times as long as pedicel, flagellum with 6 flagellomeres, all nearly equal in width, without any setae but with usual dense, short and oblique hairs. Three apical flagellomeres combined much longer than 3 basal flagellomeres. Face with lateral whitish stripes along inner eye margin. Palpi apparently absent.

Thorax about 1.5 times longer than wide, scutum shining black but postpronotal calli, upper margin of anepisternum and small postalar calli yellow to brownish yellow. Scutellum and two scutellar spines yellow, densely punctate and sparsely pilose. Two scutellar spines shorter or longer than scutellum. Legs yellow, without significant modifications. Wing ( Fig 9 ) hyaline with more or less distinct smoky darkened diffuse spots on the cup cell, anal lobe and between discal cell and apex, sometimes wing entirely hyaline except for yellowish stigma. Vein R2+3 originating beyond crossvein r-m at a distance being longer than this crossvein, wing densely covered with microtrichia. R4 absent, crossvein bm-cu not developed.

Abdomen shining brown to black with sparse hairs, very slender, usually compressed laterally and thus almost cylindrical, at least about 5 times longer than broad. Male terminalia ( Figs 11–13 , 21–25 , 30–32 ), characterized by simple or bilobate gonostyli; a phallic complex trifid, with the parameral sheath with distal projected or not; a massive and large aedeagal apodeme and moderate to elongate gonocoxal apodeme, both exceeding the anterior margin of genitalia.

Female (Figs 4, 6, 8, 15, 17, 19). Differing from male by eyes separated by a broad frons and uniform eye facets. Middle part of frons occupying about one third of head width, longitudinal median groove on frons usually shallow if visible at all. Postocular area well developed, especially broad and high in dorsal part. Abdomen mostly flat, at most as broad as thorax or slightly broader beyond middle. Female terminalia (figs 33-36) with twosegmented cerci, both cerci nearly cylindrical, apical segment longer and narrower than basal; Epiproct subtriangular; genital furca with foliated proximal process and large median aperture.

Etymology. The specific epithet is feminine and the addition of oides from Greek, meaning like, resembling, indicates a relationship of the new genus with Oxycera Meigen and Oxycerina Rozkošný & Woodley.

Distribution. China (Chongqing, Guizhou, Guangxi, Hubei, Yunnan).

Figures

FIGURES 1 – 2. Oxyceroides sinica sp. nov., male. Photo by Z. H. Yang.

FIGURES 9 – 13. Oxyceroides gracilis sp. nov. male paratype. 9. Wing. 10. Antennae. 11. Epandrium, proctiger and cerci, dorsal view. 12. Phallic complex, lateral view. 13. Genital capsule and phallic complex complex, dorsal view.

FIGURES 20 – 25. Oxyceroides sinica sp. nov. male paratype. 20. Antennae. 21. Epandrium, proctiger and cerci, dorsal view. 22. Phallic complex, lateral view. 23. Phallic complex, dorsal view. 24. Genital capsule and phallic complex, dorsal view. 25. Genital capsule and phallic complex, ventral view.

FIGURES 26 – 32. Oxyceroides tangi sp. nov., male holotype. 26. Habitus, dorsal view. 27. Head, frontal view. 28. Habitus, lateral view. 29. Antennae. 30. Epandrium, proctiger and cerci, dorsal view. 31. Phallic complex, lateral view. 32. Genital capsule and phallic complex, dorsal view.

FIGURES 33 – 36. Oxyceroides gracilis sp. nov. and Oxyceroides sinica sp. nov. female paratype. 33. ♀ terminalia (O. gracilis sp. n.), dorsal view; 34. ♀ terminalia (O. sinica sp. n.), dorsal view; 35. ♀ genital furca (O. gracilis sp. n.), dorsal view; 36. ♀ genital furca (O. sinica sp. n.), dorsal view.