Euhybus yunnanensis sp. nov., 2024

Li, Meilin, Wang, Jingyu & Yang, Ding, 2024, The genus Euhybus Coquillett (Diptera: Hybotinae) from China, with descriptions of five new species, Zootaxa 5481 (5), pp. 520-530 : 527-529

12. Euhybus yunnanensis sp. nov.

( Fig. 5 )

Diagnosis. Legs mostly blackish brown except tip of fore and mid femora, all tibiae and tarsomeres 3–5 brown; all tarsomeres 1–2 dark yellow.

Description. Male ( Fig. 5a ). Body length 3.5–3.6 mm, wing length 3.1–3.2 mm.

Head black with pale gray pollinosity. Eyes blackish brown with slightly enlarged upper facets. Setae and setulae on head black; ocellar tubercle indistinct, with 2 short anterior oc and 2 short posterior setulae. Antenna blackish; first flagellomere slightly longer than scape + pedicel, 2.5 times longer than wide, without dorsal setae; arista 2.9 to 3.5 times as long as first flagellomere, dark brown, bare except apical 1/3 or so thin. Proboscis dark brown, distinctly shorter than head, thickened, nearly obtuse apically; palpus dark brown with 1 long seta at extreme tip.

Thorax black with pale gray pollinosity except mesoscutum shiny with wide posterior portion pollinose. Setae and setulae on thorax black; h absent, 2 npl, setula-like acr biriseriate, setula-like dc uniseriate, 1 psa, scutellum with 6 marginal setulae and 2 long sc. Legs mostly blackish brown to blackish except tip of fore and mid femora, all tibiae and tarsomeres 3–5 brownish yellow to brown; all tarsomeres 1–2 dark yellow. Setae and setulae on legs dark brown to black. Fore femur nearly as thick as mid femur; hind femur 1.7 times as thick as mid femur, with row of long thin pv. Mid femur with row of weak pv. Hind femur with 1 short thick ad near apex, about 2 rows of pv spines and row of short outer pv on basal 1/3. Fore tibia apically with 1 slightly long thin pv. Mid tibia apically with 1 long pv. Hind tibia apically with 1 setula-like pd. Fore and mid tarsomere 1 with some long setulae. Hind tarsomere 1 with row of spine-like ventral setae and 1 spine-like av near apex. Wing infuscate; costal vein with longer setae on basal 2/3; blackish brown pterostigma short and rounded (about 1/6 as long as cell r 1, not filling apex of cell r 1); veins dark brown to blackish brown. Squama dark brown with brown setulae. Halter blackish brown.

Abdomen shiny blackish with thin gray pollinosity, sternites 1–6 weakly sclerotized; hypopygium slightly swollen. Mostly dark brown to blackish setae and setulae on abdomen, except sternites with nearly entirely dark yellow setae and setulae. Male genitalia: Lepn slightly narrower than repn, nearly truncate ( Fig. 5b ); lsur wide, trifurcated, with one very wide process, one slightly long square-shaped median process and one irregular process in lateral view ( Fig. 5d ). Repn with distinctly incised inner margin; rsur bifurcated, with 1 wide process bearing very long spine-like setae in lateral view ( Fig. 5c ). Hypandrium 1.8 times longer than wide, with subtriangular apical process; right lateral margin with weak apical incision ( Fig. 5g ).

Female. Unknown.

Type material. HOLOTYPE ♂, Yunnan, Yanjin, Xiaocaoba [27°56'56.14"N, 104°16'16.66"E, 1716 m], 18.VII.2022, Ding Yang ( CAU) . PARATYPE: Yunnan, Yanjin, Xiaocaoba [27°93'57"N, 104°27'77"E, 1761 m], 17.VII.2023, Sihan Li (1 ♂, CAU) .

Distribution. China (Yunnan).

Remarks. The new species is similar to E. qinlingensis from Shaanxi, but may be separated from the latter by all the tibiae brown, hind tarsomere 2 dark yellow, and rsur with one process bearing very long, spine-like setae. In E. sinensis , the tibiae are black except the mid tibia dark yellow, the hind tarsomere 2 is blackish, and the rsur has one process with marginal denticles ( Liu et al. 2014).

Etymology. The specific name refers to the type locality Yunnan.

Figures

FIGURE 5. Euhybus yunnanensis. a. Male habitus, lateral view; b. Genitalia, dorsal view; c. Right surstylus, lateral view; d. Left surstylus, lateral view; e. Right surstylus, dorsal view; f. Left surstylus, dorsal view; g. Hypandrium, ventral view. Scale bar: 0.5 mm (a); 0.1 mm (b–g).