Stegana (Oxyphortica) mediospinosa, Cheng, Yu, Xu, Miaofeng & Chen, Hongwei, 2010

Cheng, Yu, Xu, Miaofeng & Chen, Hongwei, 2010, The Stegana (Oxyphortica) convergens species group from the Oriental region (Diptera: Drosophilidae), Zootaxa 2531, pp. 57-63 : 59-60

Stegana (Oxyphortica) mediospinosa sp. nov.

( Figs 1–4 )

Diagnosis. This species, very similar to S. (O.) setifrons in the shape of gonopods, can be differentiated from it by having the surstylus slightly inward protruded ventrally, with one sclerotized process dorsally and one strong prensiseta subbasally ( Fig. 2 ).

Description. Male and female: Frons almost dark brown. Face, clypeus and gena yellow. Mesoscutum yellow in male, brownish yellow in female. Pleura yellow below. Scutellum yellow to brownish. Abdominal tergites 2nd and 3rd grayish brown, 4th to 6th black; sternites yellow, 6th and 7th tergites brown to dark brown in female.

Measurements. BL = 3.25 mm in the holotype (range in 53 4ΨΨ paratypes: 2.66–3.03 in 3, 3.35– 3.50 in ΨΨ), ThL = 1.40 mm (1.16–1.34 in 3, 1.26–1.50 in ΨΨ), WL = 2.95 mm (2.08–2.33 in 3, 2.80– 3.20 in ΨΨ), WW = 1.12 mm (0.98–1.13 in 3, 1.04–1.24 ΨΨ), arb = 8/4 (7–9/4–5), avd = 1.00 (0.76–1.00), adf = 2.00 (1.18–2.11), flw = 2.00 (1.56–1.90), FW/HW = 0.37 (0.35–0.43), ch/o = 0.08 (0.07–0.11), prorb = 1.25 (1.07–1.29), rcorb = 0.75 (0.65–0.86), vb = 0.70 (0.50–0.71), dcl = 0.51 (0.37–0.55), presctl = 0.55 (0.50–0.60), sctl = 0.92 (1.07–1.24), sterno = 0.71 (0.72–0.89), orbito = 1.56 (1.71–2.33), dcp = 0.30 (0.26– 0.35), sctlp = 0.91 (0.84–1.12), C = 3.17 (2.70–3.20), 4c = 0.73 (0.74–0.89), 4v = 1.52 (1.58–2.06), 5x = 0.83 (1.00–1.27), ac = 4.00 (3.67–3.93), M = 0.44 (0.45–0.48), C3F = 0.79 (0.74–0.93).

Specimens examined. Holotype 3 (SCAU, No. 120486), CHINA: Mengyang (22°20'N, 100°51'E), Xishuangbanna, Yunnan, 700 m, 14.ix.2002, H.W. Chen. Paratypes: CHINA: 2ΨΨ (SCAU, Nos 120487,88), same data as holotype; 43 1Ψ (KIZ) 53 (SCAU, Nos 120489 -93), 23 1Ψ (SCAU, Nos 120494 -96), Menglun, Xishuangbanna, Yunnan, 21°41'N, 101°25'E, 700–900 m, 12.viii.2001, M.J. Toda, 22.ix.2003, H.W. Chen, 16.iv.2007, H.W. Chen; 23 6ΨΨ (KIZ), Mengla, Xishuangbanna, Yunnan, 21°28΄ N, 101°38΄ E, alt. 600 m, 22–25.iv.2007, J.J. Gao. LAOS: 23 (SCAU, Nos 120497, 98), Reu Gnomnolat, 680 m, 25.v.2007, X.M. Wang.

Etymology. A combination of the Latin words: medius and spinosus, referring to the surstylus submedially with 1 strong prensiseta.

Distribution. China (Yunnan), Laos.

Figures

FIGURES 1 – 4. Stegana (Oxyphortica) mediospinosa sp. nov. 3. 1. Epandrium, cercus and surstylus (lateral view); 2. Surstylus (ventral view); 3, 4. Hypandrium, parameres, gonopods, aedeagus and aedeagal apodeme (ventral and lateral view). Scale lines = 0.1 mm.