Stegana (Steganina) dianensis, Chen, Xi-Peng & Chen, Hong-Wei, 2012

Chen, Xi-Peng & Chen, Hong-Wei, 2012, Ten new species of the Stegana (Steganina) shirozui species group (Diptera, Drosophilidae) from China, Zootaxa 3333, pp. 24-37 : 26

Stegana (Steganina) dianensis sp. nov.

( Figs 7–13 )

Diagnosis. This species is related to S. montana sp. nov., but clearly distinguishable from the latter by the scutellum and tenth sternite, in this species: scutellum yellow on distal half; tenth sternite not expanded distally ( Fig. 9 ).

Description. Male terminalia: Epandrium broadened on posterior margins, wider than 3/5 high, pointedly protruded ventrally ( Fig. 7 ). Cercus lacking pubescence ( Fig. 7 ). Surstylus with 8 prensisetae submedially ( Fig. 8 ). Tenth sternite sclerotized and furcated basally ( Fig. 9 ). Paramere with ca. 4–6 sensilla ( Figs 10, 11 ). Aedeagal opening narrow, aperture-like in ventral view ( Figs 10, 11 ). Gonopods slightly roundly protruded, with oval, strong projection dorsomedially ( Fig. 13 ).

Measurements. BL = 2.64 mm in holotype (range in 43 paratypes: 2.35–2.90 mm), ThL = 2.03 mm (1.76– 1.98 mm), WL = 4.20 mm (3.90–4.30 mm), WW = 1.64 mm (1.54–1.68 mm), arb = 6/5 (6/5–7/5), avd = 0.64 (0.64–0.73), adf = 1.38 (1.22–2.38), flw = 1.63 (1.44–1.63), FW/HW = 0.42 (0.42–0.46), ch/o = 0.24 (0.21–0.24), prorb = 0.96 (0.94–0.96), rcorb = 0.68 (0.65–0.67), vb = 0.41 (0.35), dcl = 0.54 (0.39–0.44), presctl = 0.46 (0.41– 0.47), sctl = 1.25 (1.23–1.41), sterno = 0.92 (0.92–0.93), orbito = 1.67 (1.67–2.00), dcp = 0.26 (0.25–0.26), sctlp = 2.09 (2.08–2.10), C = 2.15 (2.11–2.21), 4c = 1.00 (0.93–1.00), 4v = 1.70 (1.49–1.83), 5x = 1.70 (1.55–1.77), ac = 9.40 (9.20–9.33), M = 0.47 (0.44–0.55), C3F = 0.63 (0.63–0.67).

Type material. Holotype 3 ( SCAU, No. 120722), CHINA: Mt. Ailao, Jingdong, Yunnan, 24°32' N, 101°01' E, 2450 m, 1–3.viii.2006, HZ Cao. Paratypes: CHINA: 43 (23 in KIZ; 23 in SCAU, Nos 120723, 24), same data as holotype; 13, Samage, Weixi, Yunnan, 27°22' N, 99°51' E, 1900 m, 27.vii.2004, HW Chen ( SCAU, No. 120725).

Distribution. China (Yunnan).

Etymology. In reference to the shortened form of Yunnan province of the type locality.

Figures

FIGURES 7 – 13. Stegana (Steganina) dianensis sp. nov., male terminalia: 7. Epandrium, cercus and surstylus; 8. surstylus; 9. 10 th sternite; 10, 11. hypandrium, aedeagus and aedeagal apodeme; 12, 13. gonopods. Scale bars: 0.1 mm.