Stegana (Steganina) ancistrophylla, Wu, Liang, Gao, Jian-Jun & Chen, Hong-Wei, 2010

Wu, Liang, Gao, Jian-Jun & Chen, Hong-Wei, 2010, The Stegana (Steganina) biprotrusa species group from the Oriental Region (Diptera: Drosophilidae), Zootaxa 2721, pp. 47-54 : 50-51

Stegana (Steganina) ancistrophylla sp. nov.

( Figs 10–15 )

Diagnosis. This species is very similar to S. biprotrusa in the shape of the articulating-to-aedeagus plate and gonopods ( Figs 2, 3), but can be differentiated from it by having the tenth sternite not curved dorsad ( Figs 1, 12 ), the gonopods not strongly curved basolaterally ( Figs 14, 15 ), and the ventral part of aedeagus nearly triangular in ventral view ( Fig. 12 ).

Description. Male and female: Pedicel black. Mesonotum dark black medially, brown laterally. Katepisternum yellow in male, slightly grayish in female. Basisternum black. Scutellum black, yellow at tip in male, pale in female. Fore femur distally with 5–7 thick (male) or 5–6 thinner (female) setae on anteroventral. All abdominal sternites brown to dark brown, twice as broad as wide. Male terminalia: Epandrium with approximately 25 setae near posterior margin on each body-side ( Fig. 10 ). Hypandrium slightly round anteromedially ( Fig. 12 ). Aedeagus slightly sclerotized, bifurcated from medial portion: ventral part slightly fanlike, ridgy medially, with minute serrate processes on apical margin ( Figs 12, 13 ). Gonopods strongly sclerotized, apically curved dorsad, laterally strongly curved anteriod like hook, with numerous, minute serrate processes distally and 1 process submedially on each side ( Figs 14, 15 ).

Measurements. BL = 3.54 mm in the holotype (range in 53 5♀♀ paratypes: 3.40–3.68 mm in 3, 3.80– 4.00 mm in ♀♀), THL = 2.00 mm (1.64–2.00 mm in 3, 1.80–1.96 mm in ♀♀), WL = 3.05 mm (2.84–2.96 mm in 3, 2.94–3.13 mm in ♀♀), WW = 1.55 mm (1.28–1.40 mm in 3, 1.31–1.41 mm in ♀♀), arb = 8/5 (9/5–7/3), avd = 0.64 (0.64–0.80), adf = 1.38 (1.22–1.63), flw = 1.50 (1.67–2.00), FW/HW = 0.46 (0.38–0.51), ch/o = 0.22 (0.19–0.24), prorb = 0.87 (1.12–1.18), rcorb = 0.73 (0.65–0.73), vb = 0.57 (0.53–0.59), dc1 = 0.30 (0.29–0.43), presct1 = 0.75 (0.55–0.71), sct1 = 1.68 (1.60–1.76), sterno = damaged (0.82–1.19), orbito = 1.83 (1.29–1.67), dcp = 0.19 (0.17–0.24), sct1p = 2.00 (2.00–2.40), C = 1.93 (1.74–2.04), 4c = 1.29 (1.17–1.36), 4v = 2.15 (1.77–2.19), 5x = 1.64 (1.50–1.91), ac = 15.00 (16.40–22.50), M = 0.96 (0.53–0.67), C3F = 0.78 (0.78–0.83).

Specimen examined. Holotype: 3 (SCAU, No. 120883), CHINA: Maoershan, Guilin, Guangxi, 25°51′ N, 110°27′ E, altitude 700 m, 19.x.2004, on tree trunk, HW Chen. Paratypes: CHINA: 53312♀♀ (2332♀♀ in KIZ; 33310♀♀ in SCAU, Nos 120884 -96), same data as holotype except for 19–23.x.2004, HL Cao, HW Chen, MF Xu, XL Zhang; 13 (SCAU, No. 120897), Conghua, Guangzhou, Guangdong, 23°26′ N, 113°30′ E, altitude 200 m, 3.xi.2003, on tree trunk, HW Chen; 13 (SCAU, No. 120898), Nankunshan, Huizhou, Guangdong, 20°38′ N, 144°38′ E, altitude 450 m, 2.iv.2004, on tree trunk, HW Chen.

Distribution. China (Guangdong, Guangxi).

Etymology. From the Latin word: ancistrophyllum, referring to the gonopods curved anteroventrad.

Figures

FIGURES 10 – 15. Stegana (Steganina) ancistrophylla sp. nov., 3: 10. Epandrium, cercus and surstylus; 11. 10 th sternite; 12, 13. hypandrium, aedeagus, articulating-to-aedeagus plate (ap aed) and aedeagal apodeme; 14, 15. gonopods (for orientation and abbreviations see figs 4 – 9; scale bars: 0.1 mm).