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.