Euhybus basiflavus Li, Wang & Yang, 2024, sp. nov.
Creators: name: Li, Meilin
name: Wang, Jingyu
name: Yang, Ding
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Hybotidae
Euhybus
Euhybus basiflavus

description: 1. Euhybus basiflavus sp. nov.
(Fig. 1)
Diagnosis. Fore and mid femora black with brownish yellow tips, hind femur entirely black. Mid tibia dark yellow. All tarsomeres 1–2 yellow. Hypandrium with a long acute median process.
Description. Male (Fig. 1a). Body length 3.3 mm, wing length 3.4 mm.
Head black with pale gray pollinosity. Eyes dark yellow with weakly enlarged upper facets. Setae and setulae on head black; ocellar tubercle weak, with 2 long 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 4.2 times as long as first flagellomere, dark brown, bare, with apical 1/4 thin. Proboscis brownish, distinctly shorter than head, thickened, nearly obtuse apically; palpus dark brown with 1 long, curved 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 biseriate, setula-like dc uniseriate except only 1 posterior most dc slightly long, 1 long thin psa; scutellum with 6 marginal setulae and 2 long strong sc. Legs black except tips of fore and mid femora dark brownish yellow, tip of fore tibia and entire mid tibia bright yellow; all tarsi yellow with tarsomeres 3–5 blackish. Setae and setulae on legs black. Fore femur nearly as thick as mid femur; hind femur 2.4 times as thick as mid femur, with 2–3 long, thin preapical ad. Hind femur with row of mostly long av spines, basal portion with about 3 rows of ventral spines. Fore tibia thickened, apically with 3 thin setae (1 posterior seta longer than others); mid tibia with 2 long, strong ad, apically with 4 thin setae (of which 1 pv is relatively thick, very long, nearly as long as mid tarsomere 1). Hind tibia without dorsal setae, apically with 1 short, thick av, 1 long, thin preapical dorsal seta and 1 long, strong pd. Fore and mid tarsomere 1 with some long setulae, apically with 1 long, thin ad and 1 long, thin pd; mid tarsomere 1 with 1 long, strong pv at base. Hind tarsomere 1 with 1 strong ventral seta at base, apically with 1 strong av. Wing lightly infuscate; costal vein with thin longer setae on basal 2/3; dark brown pterostigma short and rounded (about 1/6 as long as cell r 1, not filling apex of cell r 1); veins dark brown. Squama brown with brown setulae. Halter dark 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 dark yellow basally. Male genitalia: Lepn slightly narrower than repn, with inner margin slightly incised (Fig. 1b); lsur very wide, apically irregularly bifurcated in lateral view (Fig. 1d). Repn with weakly incised inner margin; rsur rather wide, irregularly furcated, with one long, thin right process and one wide left process bearing row of long bristles in lateral view (Fig. 1c). Hypandrium distinctly 1.9 times longer than wide, apically with three processes; median process is longest and acute; left process very short and acute; right process short, finger-like (Fig. 1g).
Female. Unknown.
Type material. HOLOTYPE ♂, China: Xizang, Bomi, Palong [31°36'39.57"N, 95°21'58.44"E, 3110 m], 2013.IX.9, Gang Yao (CAU).
Distribution. China (Xizang).
Remarks. The new species is similar to E. longiseta from Xizang, but may be separated from the latter by hind tarsomeres 1–2 yellow and hypandrium with a long acute median process. In E. longiseta, the hind tarsus is entirely black, and the hypandrium has the weakly incised apical margin without median process (Wang et al. 2013).
Etymology. The specific name refers to the yellow base of the tarsi.
description: Published as part of Li, Meilin, Wang, Jingyu & Yang, Ding, 2024, The genus Euhybus Coquillett (Diptera: Hybotinae) from China, with descriptions of five new species, pp. 520-530 in Zootaxa 5481 (5) on pages 521-522, DOI: 10.11646/zootaxa.5481.5.2, http://zenodo.org/record/12782988