Stegana (Steganina) pilosella, 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 : 46-47

Stegana (Steganina) pilosella sp. nov.

( Figs 23–26 )

Specimens examined. Holotype: ♂ ( SCAU, No. 120654), CHINA: Mengla , Xishuangbanna, 600 m, ex tussock, 21.iv.2007, JJ Gao . Paratypes: CHINA: 3♂ (1♂ in KIZ, 2♂ in SCAU, Nos 120655, 56), same data as holotype, 21–24.iv.2007, HW Chen, JJ Gao .

Diagnosis. Aedeagus bifurcated from base, basally with 1 small, acute process ( Fig. 26 ); gonopods broadened medially, with 2 slender projections sublaterally ( Fig. 26 ).

Description. Male and female: Pedicel grey-yellow; first flagellomere mostly black. Palpus mostly black. Katepisternum white-yellow, slightly brownish ventrally. Legs mostly brown, white on basal parts of all femora, black on distal parts of mid and hind femora and basal parts of mid and hind 1st tarsomeres, with 2 black rings on all tibiae. Abdominal 1st to 5th tergites black medially, yellow laterally; 6th nearly black. Sternites brown. Male terminalia: Epandrium with approximately 26 setae near posterior to ventral margin on each body-side ( Fig. 23 ). Surstylus broadened ( Fig. 24 ). Cercus with sporadic pubescence ( Fig. 23 ). Plate between hypandrium and aedeagus lacking pubescence, with 1 sensillum ( Fig. 26 ).

Measurements. BL = 2.28 mm in holotype (range in 3♂ paratypes: 2.16–2.44 mm); ThL = 1.13 mm (1.06–1.16 mm); WL = 1.84 mm (1.74–2.00 mm); WW = 1.00 mm (0.96–1.00 mm in ♂). Indices: arb = 7/6 (7–8/6), avd = 0.80 (0.78–0.87), adf = 1.50 (1.36–1.60), flw = 2.00 (1.73–1.83), FW/HW = 0.40 (0.36–0.38), ch/o = 0.09 (0.09), prorb = 1.16 (1.00–1.11), rcorb = 0.79 (0.73–0.83), vb = 0.23 (0.24–0.29), dcl = 0.37, presctl = 0.57 (0.54–0.57), sctl = 1.54 (1.57), sterno = 0.86 (0.80–0.89), orbito = 2.00 (2.00–2.33), dcp = 0.25 (0.20–0.24), sctlp = 1.33 (1.00–1.27), C = 2.00 (1.87–2.04), 4c = 1.13 (1.17–1.25), 4v = 1.61 (1.64–1.78), 5x = 1.10 (1.09–1.22), ac = 8.67 (8.33–10.00), M = 0.48 (0.44–0.52), C3F = 0.67 (0.62–0.68).

Distribution. China (Yunnan).

Etymology. A Latin word: pilosellus, referring to the frons with sparse, minute setulae submedially.

Figures

FIGURES 23–26. Stegana (Steganina) pilosella sp. nov., ♂: 23. Epandrium, surstylus and cercus (lateral view); 24. surstylus (frontal view); 25. 10th sternite; 26. hypandrium, gonopods, aedeagus and aedeagal apodeme (ventral view) (For abbreviations see Figures 1–6. Scale bars: 0.1 mm).