Strenorhagio asymmetricus Zhang & Yang & Ren & Shih 2010
Creators: name: Zhang, Kuiyan
name: Yang, Ding
name: Ren, Dong
name: Shih, Chungkun
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Uranorhagionidae
Strenorhagio
Strenorhagio asymmetricus

description: STRENORHAGIO ASYMMETRICUS ZHANG, YANG & REN GEN. ET SP. NOV. (FIGS 5, 6)
Etymology: The specific name refers to the Greek ‘ asymmetricus ’ (asymmetric), because of the asymmetric position of crossvein r–m in two wings.
Diagnosis: Hind femur swollen at apical part; each tibia with a spur at apex. Crossvein r–m slightly proximal to beginning of vein R 2+ 3 in left wing, and nearly coalesced with vein R 2+3 at vein Rs (vein Rs 2 nearly disappearing) in right wing; vein CuA 1 arising from cell bm, crossvein m–cu long; basal trunk of veins M 1 and M 2 shorter than crossvein m–m; mouths of cells sc and r 1 wide, relative widths about 4: 3. Segments I–VI with black stripe at each end.
Holotype: CNU-DIB-NN2007020, an almost complete adult body with wings in dorsal view.
Paratype: CNU-DIB-NN2007021, an almost complete adult body with a wing in lateral view.
Type locality and horizon: Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China; Jiulongshan Formation, the Middle Jurassic (Aalenian–Bajocian).
Description: Body length, 13.5 mm; wing length, 8.5 mm; wing width, 3.1 mm.
Body stout. Head round, slightly narrower than thorax. Eyes large, bare; ommatidia clearly visible, with upper area composed of larger facets.
Legs pubescent. Hind femur swollen at apical part; each tibia with a spur at apex; first tarsomere distinctly much longer and wider than following tarsomeres.
Wing hyaline; veins thick and strong. Vein Sc ending slightly beyond middle of wing. Veins R 1 and Rs 1 long; vein R 2+3 distinctly and strongly bent upwards at base; vein R 5 ending slightly beyond wing apex. Crossvein r–m at basal third of cell d; proximal to beginning of vein R 2+ 3 in left wing, nearly coalesced with vein R 2+3 at vein Rs (with vein Rs 2 nearly disappearing) in right wing; vein Rs 1 shorter than vein Rs 3. All branches of vein M long, veins M 1 and M 2 bifurcating distal to crossvein m–m, basal trunk of veins M 1 and M 2 shorter than crossvein m–m. Vein CuA 1 arising from cell bm, crossvein m–cu long; vein CuP present. Mouths of cells sc and r 1 wide, relative widths 4: 3; mouths of cells r 2+3 and r 4 distinctly narrow. Cell bm about as wide as cell br; cell d slender, far from wing margin. Five posterior cells present, and wide open; mouths of cell m 1 slightly narrower than that of cell m 2; mouth of cell m 3 distinctly narrower than that of cell m 1, about half as wide as that of cell cua 1. Cell cup distinctly open.
Abdomen cylindrical, robust, and pubescent. Nine segments visible; segments I–VI with black stripe at each end.
Remarks: Because the position of crossvein r–m is asymmetric in the two wings, the crossvein m–cu is longer, the cell r 1 is narrower, and segments I–VI have black stripe at each end, we can easily separate S. asymmetricus sp. nov. from S. grimaldi sp. nov.
description: Published as part of Zhang, Kuiyan, Yang, Ding, Ren, Dong & Shih, Chungkun, 2010, An evolutional special case in the lower Orthorrhapha: some attractive fossil flies from the Middle Jurassic of China (Insecta: Diptera: Brachycera), pp. 563-572 in Zoological Journal of the Linnean Society 158 (3) on pages 568-569, DOI: 10.1111/j.1096-3642.2009.00552.x, http://zenodo.org/record/5438122