Xanthotryxus huapingensis Liu, Li & Yao 2025, sp. nov.
Creators: name: Liu, Shixin
name: Ji, Honghu
name: Li, Wenliang
name: Yao, Gang
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Polleniidae
Xanthotryxus
Xanthotryxus huapingensis

description: Xanthotryxus huapingensis Liu, Li & Yao sp. nov.
Figs 21–25, 26–30
Type material.
Holotype • (dissected), male (HAUST), CHINA: Guangxi Zhuang Autonomous Region, Guilin City, Lingui District, Huangsha Yao Township, Anjiangping, 25°55'6"N, 109 ° 94 ' 4 " E, 1. VI. 2023, 1340 m, leg. Shixin Liu. Paratypes • 2 males (HAUST), same data as holotype.
Diagnosis.
Eyes bare; third antennal segment about 2.5 times longer than second antennal segment, third antennal segment as long as distance from vibrissa to epistoma; eyes 3 times higher than gena; palpus black; h 4, ppl 3, with a tuft of crinkly golden hairs; postalar declivity with a dense tuft of crinkly golden hairs; legs black; subcostal sclerite yellowish, with dense yellow tomentum and 2–3 setae; surstyli terminal extension and hook-like in lateral view.
Description.
Male. Black species. Thorax black with crinkly golden hairs. Wing brownish-yellow. Legs black. Abdomen black tessellate yellow sarcophagids markings.
Head (Figs 21, 23, 24). Eyes red, bare; frons black, with sparse short black hair, eminence near antennae; interfrontalia surface linear at narrowest part; parafacial and mediane dull red, bare, with yellowish-white tomentum; lunule bare; antennae brownish, with yellowish-white tomentum, third antennal segment about 2.5 times longer than second antennal segment, arista plumose; facial carina well developed; third antennal segment as long as distance from vibrissa to epistoma; gena black, with dense black hairs; eyes 3 times higher gena; palpus black.
Thorax (Figs 21, 23). black, with dense crinkly golden hairs; acr 2 + 3, dc 2 + 3, ial 0 + 2, h 4, ph 3 + 0, pra 1, sal 2, pal 2; anterior and posterior spiracles black, proepimeral bristles present; anepisternum with a dense tuft of crinkly golden hairs on the posterior margin, mpl 0 + 6, spl 1 + 1, ppl 3, with a tuft of crinkly golden hairs; postalar declivity with a dense tuft of crinkly golden hairs.
Wing (Fig. 25) brownish-hyaline; epaulet and basicostal scale black; subcostal sclerite yellowish, with dense yellow tomentum and 2–3 setae; radial stem vein bare, radial vein knob with yellow tomentum; upper calypter and lower calypter reddish-brown.
Legs (Fig. 23) black, femora with white tomentum; tarsi with dense short yellow hairs on ventral surface; fore femur with 11 d, 13 pd, 14 v; mid femur with 11 v; mid tibia with 1 ad, 2 pd; hind femora with 1 d, 14 ad, 1 pd, 10 v, 7 av; hind tibia with 3 ad, 5 pd.
Abdomen (Figs 22, 23) black, tessellate yellow sarcophagids markings; ST 1 with yellow setae, ST 2–5 with black setae and yellow setae; ST 5 two prominences on the ventral surface (Fig. 29). Male terminalia: end of surstyli curved inward in posterior view (Fig. 26); end of cerci sharp and curved backward in posterior view (Fig. 26); surstyli hook-like in lateral view (Figs 27, 28); pregonites with a row of black setae, postgonites bare; paraphallus slender and curved forward; hypophallus membranous; acrophallus well developed and terminal trumpet (Figs 28, 30).
Female. Unknown.
Measurements.
Male. Body length 11.3–14.5 mm.
Etymology.
The specific epithet is chosen after Huaping National Nature Reserve, Guangxi Province where the holotype was collected.
Distribution.
China (Guangxi).
Remarks.
The new species is similar to X. draco Aldrich, 1930, but it differs by the following points: h 4, ph 3 + 0, ppl 3, base of the antennae distinctly separated, terminal extension of surstyli hook-like in lateral view. The new species paraphallus is slender, and the acrophallus is not as developed as in X. draco. The new species phallus is rather similar to that of X. mongol and X. uniapicalis, but can be separated from the latter two as follows: the end of the X. mongol paraphallus is approximately angular curved, while in the new species the paraphallus terminal is arc-shaped and bent; moreover, the new species paraphallus is thinner than that of X. mongol; the new species paraphallus does not bend forward beyond the hypophallus in lateral view, whereas the X. uniapicalis paraphallus bends forward over the hypophallus in lateral view.
description: Published as part of Liu, Shixin, Ji, Honghu, Li, Wenliang & Yao, Gang, 2025, Three new species of Polleniidae (Diptera) from China, pp. 99-114 in ZooKeys 1228 on pages 99-114, DOI: 10.3897/zookeys.1228.129419