Norellisoma yintiaoense, Cai & Li & Cao & Yang, 2023

Cai, Xiao-Dong, Li, Xin, Cao, Wen-Qiang & Yang, Ding, 2023, Two new species of the genus Norellisoma Wahlgren, 1917 (Diptera, Scathophagidae) from Yintiaoling Nature Reserve, Chongqing, China, ZooKeys 1168, pp. 151-159 : 151

Norellisoma yintiaoense sp. nov.

Figs 3 , 4 , 10-14

Type material.

Holotype: ♂, China: Chongqing: Wuxi, Yintiaoling Nature Reserve, 31°28'15"N, 109°56'33"E; 2385 m a.s.l.; 22. vii. 2022, leg. Xulong Chen (CAU); CAU(H)202398201. Paratypes: 1♂ 2♀♀, same data as holotype (CAU); CAU(P)202398202 - CAU(P)202398204.

Diagnosis.

Thorax yellow, scutum along dorsocentral setae with blackish stripe. Male sternite 4 rectangular, wider than long. Male sternite 5 with long narrow nearly parallel lateral lobes and two short median projections. Pregonite with 3 yellow setae; postgonite apically curved.

Description.

Male (Figs 3 , 4 ) Body length 5.33-6.00 mm, wing length 4.33-5.50 mm.

Head yellow. Eyes reddish brown. Setulae on head yellow, setae black; 3 fr s, 2 orb s, 1 oc s, 1 i vt s, 1 o vt s, 1 poc s. 1 pair of strong vibrissae. Antenna yellow except arista yellow to blackish brown, first flagellomere 2 times as long as deep; arista with short blackish brown pubescence. Proboscis yellow; palpus yellow with yellow setulae and setae.

Thorax yellow, scutum along dorsocentral setae with blackish stripe. Hairs on thorax yellow, setae black. 2+3 dc s, 1+2 spal s, 1 pprn s, 2 npl s, 2 pal s. Proepisternum with 1 yellowish brown seta. Anepisternum with 3 long setae near posterior margin. Katepisternum with 1 seta in posterodorsal corner. Scutellum with one pair of strong setae.

Legs mostly yellow, but mid and hind femora usually blackish dorso-distally. Setulae on legs yellow, setae black or yellowish brown. Fore femur with row of 5 short av and 8 long pv. Fore tibia with 1 ad, 1 pd, 5 av, 4 pv and 1 preapical d. Mid femur with 1 pd, 1 av, 3-4 a. Mid tibia with 1 ad, 1 pd and 2 av, also with 1 d, 1 v, 1 pv at apex. Hind femur with 2 v and row of 5 short a. Hind tibia with 2 ad, 1 d, 2 pd and 1 av at apex.

Wings hyaline; veins brown. R1 bare; CuA2+ A1 not extending to wing margin. Calypter yellow. Halteres yellowish white.

Abdomen blackish brown. Setulae and setae yellowish brown. Male sternite 4 rectangular, wider than long. Male sternite 5 with long narrow nearly parallel lateral lobes and two short median projections.

Male genitalia (Figs 10-14 ): Epandrium yellowish brown; surstylus curved inward and antero-apically broadened slightly; cercus well broadened, covered with black brown setulae; distiphallus dorsally sclerotized and apically slender; pregonite broad and apically with 3 yellow setae; postgonite rod-shaped, apically curved.

Female: Body length 6.50-6.67 mm, wing length 5.85-6.00 mm.

Distribution.

China (Chongqing).

Etymology.

The specific epithet refers to the type locality Yintiaoling Nature Reserve.

Remarks.

This new species is similar to Norellisoma wuxiense sp. nov., but may be separated from the latter by the following features: pregonite not curved with 3 yellow apical setae and postgonite apically curved.

Figures

Figure 3. Norellisoma yintiaoense sp. nov. (holotype, male). Habitus, lateral view. Scale bar: 0.5 mm.

Figure 4. Norellisoma yintiaoense sp. nov. (holotype, male). Habitus, dorsal view. Scale bar: 0.5 mm

Figures 10 - 14. Norellisoma yintiaoense sp. nov. 10 male sternite 4, ventral view 11 male sternite 5, ventral view 12 male terminalia, lateral view 13 male terminalia, posterior view 14 aedeagus and associated parts, lateral view. Scale bars: 0.2 mm.