Diaphorus longrenensis, Liu, Ruosi, Wang, Mengqing & Yang, Ding, 2015

Liu, Ruosi, Wang, Mengqing & Yang, Ding, 2015, Three new species of Diaphorus Meigen (Diptera: Dolichopodidae) from Tibet, Zootaxa 3946 (2), pp. 233-240 : 236-237

Diaphorus longrenensis sp. nov.

( Figs 3 , 7 , 11 )

Diagnosis. Eyes separated on frons and face, with parallel lateral margins. Legs mainly dark brown except tip of fore femur dark yellow ( Fig. 3 ). Ventral lobe of surstylus thin and long, somewhat tapered at apex.

Description. Male. Body length 2.5–2.7 mm, wing length 2.3–2.5 mm. Head metallic green with pale gray pollinosity. Ocellar tubercle distinct; 1 pair of vertical bristles. Eyes separated on frons and face, with parallel lateral margins. Hairs and bristles on head black; postocular bristles (including posterior ventral hairs) black. Antennal scape and pedicel black; first flagellomere dark brown, subtrapezoid (about 1.1 times wider than long); arista dark brown, with short basal segment ( Fig. 7 ). Proboscis brown with black hairs; palpus black with 4–5 black bristles. Thorax metallic green with pale gray pollinosity. Hairs and bristles on thorax black; 5 strong dc, 5–7 irregularly paired short and hair-like acr; scutellum with 2 pairs of bristles, basal pair long, lateral pair short and hair-like. Legs mainly dark brown except tip of fore femur dark yellow. Hairs and bristles on legs black. Fore coxa with anterior bristles; mid coxa with anterior bristles and hairs; hind coxa with 2 outer bristles at basal 1/5 and 2/3. Fore femur with rows of av; mid femur with 1 strong pv at basal 1/3 and one row of weak av; hind femur with row of pv. Fore tibia with 2 weak ad at basal 1/4 and 1/2, apically with 4 weak bristles; mid tibia with 1 strong ad at basal 1/5 and 1 ad at basal 1/2, 3–4 pd, apically with 3–4 bristles; hind tibia with 1 ad at basal 1/4, 3–4 pd, 4–5 pv, apically with 3–4 bristles. All tarsi with claws and weak pulvilli shorter than tarsomere 5. Relative lengths of tibia and 5 tarsomeres of legs LI 5.4: 2.8: 1.4: 1.0: 0.8: 0.8; LII 7.0: 3.8: 1.8: 1.2: 0.8: 0.8; LIII 8.0: 3.0: 2.2: 1.5: 1.0: 0.9. Wing hyaline, tinged brown; veins dark brown, R4+5 and M1 nearly parallel apically; CuAx ratio 0.25.

Squama pale brown with black hairs. Halter pale. Abdomen metallic green with pale gray pollinosity; hairs and bristles on abdomen black. Tg1–5 with posterior bristles on posterior margin; st8 with 4 strong bristles. Male genitalia ( Fig. 11 ): Epandrium about as long as wide; lateral epandrial lobe thin and long, with 2 bristles at apex; ventral lobe of surstylus thin and long, somewhat tapered at apex; cercus short, with weak ventral lobe; apex of phallus thin and long. Female. Unknown.

Specimens examined. HOLOTYPE ♂, China, Tibet, Dangxiong, Longren, 30°49′N, 91°33′E, 4209 m, 2013. VII. 30, X.Y. Liu. PARATYPE: 2♂, same as holotype.

Distribution. China (Tibet).

Remarks. The new species is similar to Diaphorus baheensis sp. nov. on the basis of the similar thin and long lateral epandrial lobe with 2 bristles at apex, but can be separated from the latter by the ventral lobe of surstylus thin and long, somewhat tapered at apex. In D. baheensis sp. nov., the ventral lobe of surstylus has an expanded apex, somewhat wide at base, but thin at the middle.

Etymology. The specific epithet refers to the locality of the holotype, Longren.

Figures

FIGURES 1 – 4. Habitus, lateral view (male). 1. Diaphorus anatoli; 2. Diaphorus baheensis sp. nov.; 3. Diaphorus longrenensis sp. nov.; 4. Diaphorus nigripedus sp. nov. Scale bars = 1 mm.

FIGURES 5 – 8. Antenna, lateral view (male). 5. Diaphorus anatoli; 6. Diaphorus baheensis sp. nov.; 7. Diaphorus longrenensis sp. nov.; 8. Diaphorus nigripedus sp. nov. Scale bars = 0.2 mm.

FIGURES 11 – 12. Genitalia, lateral view, (male). 11. Diaphorus longrenensis sp. nov.; 12. Diaphorus nigripedus sp. nov. Scale bars = 0.1 mm. Abbreviations: cer, cercus; epn, epandrium; dsur, dorsal lobe of surstylus; hyp, hypandrium; lel, lateral epandrial lobe; pg, postgonite; ph, phallus; vsur, ventral lobe of surstylus.