Stegana (Steganina) eurystoma, Wang & Gao & Chen, 2013

Wang, Le, Gao, Jian-Jun & Chen, Hong-Wei, 2013, Ten new species of the subgenus Steganina (Diptera: Drosophilidae: Stegana) from southern China, Journal of Natural History (J. Nat. Hist.) 47 (29 - 30), pp. 1993-2013 : 1999-2000

Stegana (Steganina) eurystoma sp. nov.

( Figure 3 )

Diagnosis

This species is similar to S. sphaerica sp. nov. in the cercus with dense pubescence and the surstylus lacking prensiseta and serrated, minute processes on outer surface, can be differentiated from it by having the paramere distinctly present and with ca. four sensilla ( Figure 3C, D ), the dorsal projection of gonopods strong and not pointed apically ( Figure 3F ), the aedeagal opening flat and with some minute processes on posterior margin ( Figure 3C, D ).

Description

Frons brownish, lacking minute setulae. Fronto-orbital plate yellow. Pedicel and first flagellomere mostly brownish. Face dark brown on upper two-thirds, yellow on lower margin. Clypeus brownish medially, yellow laterally. Scutum brown medially, yellow laterally. Basisternum yellow. Scutellum dark brown. Wing brown anteriorly, yellowish posteriorly, dark on all crossveins. Fore femur with one row of three or four suberect setae on ventral surface. Abdominal tergites black medially, yellow laterally. Sternites yellow, much broadened, wider than length. Male terminalia: tenth sternite broadened medially ( Figure 3B ). Hypandrium roundly expanded anteromedially ( Figure 3C ). Dorsal projection of gonopods with serrated, minute processes ( Figure 3E, F ). Aedeagus broadened distally in ventral view, medially with pubescence on anterior margin of opening ( Figure 3C, D ).

Measurements

BL = 3.52 mm in holotype (range in three ♂ and three ♀ paratypes: 2.80–3.15 in ♂, 2.96–3.40 in ♀), ThL = 1.24 mm (1.40–1.68 in ♂, 1.48–1.52 in ♀), WL = 2.08 mm (2.16–2.44 in ♂, 2.04–2.28 in ♀), WW = 1.16 mm (0.96–1.04 in ♂, 0.94–1.16 in ♀), arb = 12 / 7 (8–16 / 4–8), avd = 0.70 (0.71–1.29), adf = 1.67 (1.40–2.25), flw = 1.83 (1.50–2.75), FW / HW = 0.35 (0.33–0.41), ch / o = 0.24 (0.11–0.27), prorb = 0.85 (0.67–1.21), rcorb = 0.62 (0.47–0.93), vb = 0.56 (0.24–0.57), dcl = 0.44 (0.42–0.75), presctl = 0.56 (0.61–0.83), sctl = 2.38 (1.88–2.36), sterno = 0.58 (0.50–0.68), orbito = 2.00 (1.40–1.80), dcp = 0.20 (0.19–0.29), sctlp = 2.83 (1.86-3.20), C = 1.87 (1.63–1.97), 4c = 1.20 (1.14–1.35), 4v = 1.84 (1.68–1.96), 5x = 2.14 (1.67–1.89), ac = 15.00 (15.50–16.50), M = 0.60 (0.59–0.74), C3F = 0.71 (0.70–0.77).

Type material

Holotype ♂ ( SCAU, No. 121181) and paratypes three ♂, three ♀ (one ♂ and one ♀ in KIZ; two ♂ and two ♀ in SCAU, Nos 121182–85), CHINA: Menglun, Mengla, Xishuangbanna , Yunnan, altitude 700 m, 16–19 April 2007, HW Chen, JJ Gao.

Etymology

A combination of the Greek words: eurys + stoma referring to the broad aedeagal opening.

Distribution

China (Yunnan).

Figures

Figure 3. Stegana (Steganina) eurystoma sp. nov., male terminalia: (A) epandrium, cercus and surstylus; (B) 10th sternite; (C, D) hypandrium, parameres, aedeagus and aedeagal apodeme; (E, F) gonopods. Scale bars: 0.1 mm.