Stegana (Steganina) nulliseta, Cheng, Gao & Chen, 2009

Cheng, Yu, Gao, Jian-Jun & Chen, Hong-Wei, 2009, Stegana ornatipes species group from the Oriental Region (Diptera: Drosophilidae), Zootaxa 2216 (1), pp. 37-48 : 44-45

Stegana (Steganina) nulliseta sp. nov.

( Figs 19–22 )

Specimens examined. Holotype: ♂ ( SCAU, No. 120652), CHINA: Mengla, Xishuangbanna , Yunnan, 600 m, ex tussock, 23.iv.2007, JJ Gao . Paratypes: CHINA: 3♂ (2♂ in KIZ, 1♂ in SCAU, No. 120653), same data as holotype, 21–24.iv.2007, HW Chen, JJ Gao .

Diagnosis. Aedeagus composed of 1 pair of small, rod-like processes, 2 pairs of lobe-like processes bearing several sclerotized, serrated projections and 1 arcuate process ( Fig. 22 ); gonopods with only 1 acute projection medially ( Fig. 22 ).

Description. Male and female: Pedicel grey-yellow; first flagellomere mostly black. Palpus almost black. Katepisternum dark brown on upper part, white on lower part. Legs mostly brown, dark on basal part of all 1st tarsomeres, pale on the rest tarsomeres, white on basal parts of fore femur and distal part of mid tibia. Male terminalia: Epandrium with approximately 16 setae near posterior to ventral margin on each body-side ( Fig. 19 ). Surstylus thin on distal 1/3 ( Figs 19, 20 ). Cercus lacking pubescence ( Fig. 19 ). Plate between hypandrium and aedeagus lacking pubescence ( Fig. 22 ).

Measurements: BL = 2.31 mm in holotype (range in 3♂ paratypes: 2.22–2.47 mm); ThL = 1.13 mm (1.00– 1.13 mm); WL = 1.88 mm (1.68–1.88 mm); WW = 1.02 mm (0.88–1.04 mm). Indices: arb = 8/7 (7–8/ 6–7), avd = 0.85 (0.71–0.79), adf = 1.18 (1.17–1.27), flw = 1.82 (1.67–2.00), FW/HW = 0.37 (0.36–0.39), ch/ o = 0.09 (0.07–0.09), prorb = 1.14 (1.10–1.20), rcorb = 0.81 (0.71–0.80), vb = 0.28 (0.24), dcl = 0.39 (0.39– 0.50), presctl = 0.64 (0.63), sctl = 1.76 (1.43–1.46), sterno = 0.87 (0.88), orbito = 2.17 (2.00–2.50), dcp = 0.21 (0.18–0.21), sctlp = 1.00 (1.00–1.19), C = 1.86 (1.88–2.00), 4c = 1.22 (1.23–1.30), 4v = 1.74 (1.82–1.90), 5x = 1.40 (1.20–1.22), ac = 9.33 (8.67–9.00), M = 0.61 (0.55–0.57), C3F = 0.66 (0.63–0.70).

Distribution. China (Yunnan).

Etymology. A combination of the Latin words: nullus and setae, referring to the cercus lacking pubescence.

Figures

FIGURES 19–22. Stegana (Steganina) nulliseta sp. nov., ♂: 19. Epandrium, surstylus and cercus (lateral view); 20. surstylus (frontal view); 21. 10th sternite; 22. hypandrium, gonopods, aedeagus and aedeagal apodeme (ventral view) (For abbreviations see Figures 1–6. Scale bars: 0.1 mm).