Sinorhagio daohugouensis, Zhang, Kuiyan, Yang, Ding & Ren, Dong, 2006

Zhang, Kuiyan, Yang, Ding & Ren, Dong, 2006, The first snipe fly (Diptera: Rhagionidae) from the Middle Jurassic of Inner Mongolia, China, Zootaxa 1134, pp. 51-57 : 55-56

Sinorhagio daohugouensis sp. nov. (Figs. 3–4)

Description. Female body length 10.1 mm, wing length 8.0 mm, wing width 2.9 mm.

Head subround in lateral view, length about 1.0 mm; vertex with row of short setae. Antenna bare and long, slightly shorter than head; scape obscure, pedicel nearly square, flagellum long, roughly 7 times as long as pedicel; nearly spine­like, tapering toward tip (but segmentation obscure in the specimen) (Fig. 3). Proboscis long and thick, subequal to head height; palpus partially preserved.

Thorax black. Only one acrostichal seta on mesonotum preserved. Most legs visible with pubescence. Hind tibia with 1 spur, spur of mid tibiae not preserved; first tarsomere of mid and hind legs distinctly longer than following tarsomeres. Hyaline wing: Pterostigma present. C vein with short setulae. Sc ending at middle of wing. Crossvein h located at middle of cell c and slightly distal of the origin of Rs. Vein R2+3 long, straight apically; vein R5 ending slightly beyond wing tip. Rs nearly as long as trunk of R4+R5. Relative lengths of R5 and trunk of R4+R5 about 2: 1. Veins M1 and M2 convergent basally at cell d; vein CuA1 present and arising from cell bm, crossvein m­cu short. CuA2 longer than 1/2 of cell bm. Mouths of cell sc, cell r1 and cell r2+3 subequal in width; mouth of cell r4 much narrower than that of cell r2+3. Cell r4 longer than cell m1. Cell br (= basal radial) longer than cell bm. Cell d slender, crossvein r­m located nearly at middle of trunk of R4 + R5. Five posterior cells present, all of them open wide. Cell cup closed with a short petiole apically. Anal lobe narrow.

Abdomen long, covered with setulae; narrowing toward tip, with 9 visible segments (segment IX obscure); segment II widest, but boundary of segments I and II obscure in the specimen. Cerci two­segmented (Fig. 4).

Holotype. One almost complete well­preserved body with wings, female, No. CNU­ B­NN2005001 housed in Key Lab of Insect Evolution & Environment Change, Capital Normal University, Beijing, China.

Locality and horizon. Daohugou Village, Shantou township, Ningcheng county, Inner Mongolia, China; Jiulongshan Formation, Middle Jurassic (Aalenian­Bajocian).

Etymology. The species is named after the type locality: Daohugou village ( China).

FIGURES 3–4. Sinorhagio daohugouensis sp. nov. (female). 3. Antenna (excluding scape); 4. apex of abdomen. C1 and C2, segments 1–2 of cercus.