Euhybus wuyishananus 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 : 526-527

10. Euhybus wuyishananus sp. nov.

( Fig. 4 )

Diagnosis. Arista short pubescent except apical 1/3 or so thin and bare. Setula-like acr quadriseriate. Legs mostly black except fore and mid tibia and tarsomeres 1–2 brown; fore and mid tarsomeres 3–5 and hind tarsi blackish brown. Wing infuscate, dark brown, darker than other Euhybus . Rsur irregular, with a narrow median cleft.

Description. Male ( Fig. 4a ). Body length 4.5 mm, wing length 4.9 mm.

Head black with pale gray pollinosity. Eyes blackish with slightly enlarged upper facets. Setae and setulae on head black; ocellar tubercle distinct, with 2 anterior oc and 2 short posterior setulae. Antenna blackish brown; first flagellomere brown distinctly longer than scape + pedicel, 3.3 times longer than wide, without dorsal setae; arista 3.1 times as long as first flagellomere, blackish brown, pubescent except apical 1/3 or so thin and bare. Proboscis blackish brown, distinctly shorter than head, thickened, nearly obtuse apically; palpus dark brown with 1 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 long strong npl, setula-like acr quadriseriate, setula-like dc uniseriate except only 1 posteriormost dc long, 1 psa, scutellum with 6 marginal setulae and 2 long sc. Legs mostly black except tarsomeres 1–2 brown, fore and mid tarsomeres 3–5 and hind tarsi blackish brown. 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 slightly long thin pv. Mid femur with row of mostly long av and row of very long pv on basal 1/2. Hind femur with 2 long thick av near midlle, about 2 rows of pv spines and row of outer pv. Fore tibia apically with 1 long thick 1 ad and 1 pv. Mid tibia with 3–4 thick or thin ad on basal 1/2; apically with circle of 6 setae including 1 very thick pd and 1 long pv. Hind tibia with 2 ad on basal 1/2; apically with circle of setae including 1 long pd. Fore and mid tarsomere 1 with some long setulae, apically with 1 ad; mid tarsomere 1 with row of ad and pd on basal 1/2; apically with circle of setae. Hind tarsomere 1 with row of long, strong ventral setae and 1 spine-like av near middle. Wing infuscate, dark brown, darker than other Euhybus ; costal vein with longer setae on basal 1/3; dark brown pterostigma long and rounded (about 1/3 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 black with thin gray pollinosity, sternites 1–3 weakly sclerotized; hypopygium distinctly swollen, broader than abdomen. Blackish setae and setulae on abdomen, except sternites with nearly entirely dark yellow setae and setulae. Male genitalia: Lepn as wide as repn, with inner margin slightly incised ( Fig. 4b ); lsur trifurcated, left process long thick finger-like with truncated apical margin in lateral view ( Fig. 4d ). Repn with one process on inner margin near middle; rsur irregular, with narrow median cleft in lateral view ( Fig. 4c ), left margin below Repn with row of bristles in dorsal view ( Fig. 4e ). Hypandrium distinctly 2.2 times longer than wide, obtuse apically, with incision on apical margin ( Fig. 4g ).

Female. Unknown.

Type material. HOLOTYPE ♂, China: Fujian, Wuyishan, Tongmucun, Guadun [27°44'44.23"N, 117°38'38.43"E, 1033 m], 2021. VI. 22, Qicheng Yang ( CAU).

Distribution. China (Fujian).

Remarks. The new species is similar to E. sinensis from Guangdong, but may be separated from the latter by legs mostly black and rsur with a narrow median cleft. In E. sinensis , legs are mostly brownish yellow; the rsur has two separate processes and a wider U-shaped median cleft ( Liu et al. 2004).

Etymology. The specific name refers to the type locality, Wuyishan.

Figures

FIGURE 4. Euhybus wuyishananus. 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).