Norellisoma wuxiense, 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 wuxiense sp. nov.

Figs 1 , 2 , 5-9

Type material.

Holotype: ♂, China: Chongqing: Wuxi, Yintiaoling Nature Reserve, 31°28'15"N, 109°56'33"E; 2939 m a.s.l.; 14. viii. 2022, leg. Xulong Chen (CAU); CAU(H)202398101. Paratypes: 4♂♂ 4♀♀, same data as holotype (CAU); CAU(P)202398102 - CAU(P)202398109.

Diagnosis.

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

Description.

Male (Figs 1 , 2 ). Body length 5.77-6.33 mm, wing length 5.17-5.33 mm.

Head yellow. Eyes reddish brown, occiput yellow to black. Setulae on head yellow, setae brown to black; 3-4 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 wide; 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, 1 npl s, 2 pal s. Proepisternum with 1 yellowish brown seta. Anepisternum with 1 long seta 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 8 short av and 10 long pv. Fore tibia with row of 7 av and 4 pv, also with 1 ad, 1 d, 1 pd at apex. Mid femur with 1 pd and row of 5 short a. Mid tibia with 1 ad, 1 pd and 1 av, also with 1 ad, 1 d, 1 pd, 1 v, 1 pv at apex. Hind femur with 1 v and row of 5 short a. Hind tibia with 3 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 yellow. Male sternite 4 rectangular, wider than long. Male sternite 5 with diverging lateral lobes and two short median projections.

Male genitalia (Figs 5-9 ): Epandrium yellowish brown with hair-like setulae; surstylus curved inward and antero-apically broadened slightly; cercus well broadened, covered with black setulae; distiphallus dorsally sclerotized and apically slender; pregonite broad, dorsally curved with 3 brown setae; postgonite rod-shaped, dorsally curved.

Female: Body length 6.0-7.0 mm, wing length 5.0-6.0 mm.

Distribution.

China (Chongqing).

Etymology.

The specific epithet refers to the type locality Wuxi.

Remarks.

This new species is similar to Norellisoma spinimanum ( Fallén, 1819), but may be separated from the latter by the following features: male sternite 4 rectangular, wider than long; male sternite 5 with diverging lateral lobes and two short median projections.

Figures

Figure 1. Norellisoma wuxiense sp. nov. (holotype, male). Habitus, lateral view. Scale bar: 0.5 mm.

Figure 2. Norellisoma wuxiense sp. nov. (holotype, male). Habitus, dorsal view. Scale bar: 0.5 mm.

Figures 5 - 9. Norellisoma wuxiense sp. nov. 5 male sternite 4, ventral view 6 male sternite 5, ventral view 7 male terminalia, lateral view 8 male terminalia, posterior view 9 aedeagus and associated parts, lateral view. Epiph = epiphallus, pgt = postgonite, distph = distiphallus, pregt = pregonite, epand = epandrium, sur = surstylus, cerc = cercus, st 4 = sternite 4, st 5 = sternite 5. Scale bars: 0.2 mm.