Dexopollenia chongqingensis Liu, Li & Yao, 2025

Liu, Shixin, Ji, Honghu, Li, Wenliang & Yao, Gang, 2025, Three new species of Polleniidae (Diptera) from China, ZooKeys 1228, pp. 99-114 : 99-114

Dexopollenia chongqingensis Liu, Li & Yao sp. nov.

Figs 11–15 , 16–20

Type material.

Holotype • (dissected), male ( HAUST), CHINA: Red flag guard station , Yintiaoling, Wuxi County, Chongqing, 31°30'32.2972"N, 109°49'10.8334"E, 16. VIII. 2023, 1125 m, leg. Xulong Chen. Paratypes • 2 males ( HAUST), same data as holotype .

Diagnosis.

Eyes bare; interfrontalia reddish-brown; parafrontal gray, with seven pairs of frontal setae; parafacial and ocellar triangle reddish-brown, parafacial base gray; first and second antennal segments brown, third antennal segment reddish-brown except base brown, third antennal segment about 2.5 times longer than second antennal segment, arista plumose; eyes 3 times height of gena. Thorax black, acr 1 + 2, dc 2 + 3, ial 0 + 2, h 2, ph 1 + 0, pra 1, sal 1, pal 2; scutellum dark reddish-brown. T 1 + 2 all yellow, T 3–4 with a dark stripe in the middle, T 4 almost black, T 5 all black; surstyli end bends to both sides in posterior view; cercus slender, terminal tip bottom 2 / 5 black in dorsal view; surstyli broad in lateral view.

Description.

Male. Thorax appears black in ground colour, slightly white pollinose. Wing brownish-yellow. Legs yellow. Abdomen largely yellow, T 1 + 2 all yellow, T 3–4 with a dark stripe in the middle, T 4 almost black, T 5 all black.

Head (Figs 11 , 13 , 14 ). Eyes red, bare; eyes holoptic; frons narrow, interfrontalia surface disappears at narrowest part, interfrontalia reddish-brown; parafrontal gray, with seven pairs of frontal setae; parafacial and ocellar triangle reddish-brown, parafacial base gray; gena yellow, with dense black setae; lunule bare; first and second antennal segments brown, third antennal segment reddish-brown except base brown, third antennal segment about 2.5 times longer than second antennal segment, arista plumose; mid-facial plate dark reddish-brown, facial carina not particularly developed; palpus yellow; eyes 3 times higher than gena; postgena concolorous with gena, all yellow.

Thorax (Figs 11 , 13 ) black, with slightly white pruinescence; prodorsum and dorsum of mesothorax with crinkly golden hair; acr 1 + 2, dc 2 + 3, ial 0 + 2, h 2, ph 1 + 0, pra 1, sal 1, pal 2; scutellum dark reddish-brown; anterior and posterior spiracles yellow, proepimeral setae present; anepisternum black, with crinkly golden hair, mpl 0 + 4, spl 1 + 1; ppl absent, with a tuft of crinkly golden hair; inferior laterotergite bare.

Wing (Fig. 15 ) brownish-hyaline; epaulet and basicostal scale yellow, subcostal sclerite yellowish, bare; radial stem vein and subalar knob bare; 2 R 5 open; upper calypter and lower calypter brown, halter yellow.

Legs (Fig. 13 ) yellow, fore femur with 10 pv, 4 pd, 3 p; fore tibia with 3 p, 2 ad; mid femur with 3 pv, 2 av; mid tibia with 1 ad, 1 pd; hind femora with 7 ad, 7 av, 5 pd; hind tibia with 3 ad, 2 pd.

Abdomen (Figs 12 , 13 ) largely yellow, with dense black hairs; T 1 + 2 all yellow, T 3–4 with a dark stripe in the middle, T 4 almost black, T 5 all black; ST 1–4 with long black seta, ST 5 tip with long black seta (Fig. 19 ). Male terminalia: surstyli end bends to both sides in posterior view (Fig. 16 ); cercus slender, terminal tip bottom 2 / 5 black in posterior view (Fig. 16 ); surstyli broad in lateral view (Figs 17 , 18 ); pregonite with a row of black seta anteriorly, and one black seta posteriorly; paraphallus terminal curved forward; hypophallus and acrophallus membranous (Figs 18 , 20 ).

Female. Unknown.

Measurements.

Male. Body length 3.4–8.6 mm.

Etymology.

The specific epithet is chosen after Chongqing where the holotype was collected.

Distribution.

China (Chongqing).

Remarks.

This new species is similar to D. maculata Villeneuve, 1933 , differing in the following points: tarsus yellow, T 4 mostly black, and T 5 all black. The cerci are slender and the basal 2 / 5 is black in posterior view. Surstyli are more slender than D. maculata in lateral view. The terminal paraphallus in the new species is approximately angular and curved; in D. maculata the terminal paraphallus is arc-shaped and bent. The lower part of the paraphallus in the new species is wide and in D. maculata it is slender.

Figures

Figures 11–15. Dexopollenia chongqingensis Liu, Li & Yao, sp. nov. male (holotype) 11 head, thorax, dorsal view 12 abdomen, dorsal view 13 habitus, lateral view 14 head, anterior view 15 wing. Scale bars: 3 mm.

Figures 16–20. Dexopollenia chongqingensis Liu, Li & Yao, sp. nov. male terminalia 16 cercus and surstyli, posterior view 17 cercus and surstyli, lateral view 18 terminalia lateral view 19 ST 5 ventral view 20 phallic complex, lateral view. Scale bars: 0.3 mm.