Stegana (Oxyphortica) dainuo Wang and Chen, 2017

Wang, Nannan, Zhang, Yuan, Cheng, Yu & Chen, Hongwei, 2017, Nine new species of the subgenus Stegana (Oxyphortica) from the Oriental region, with morphological and molecular evidence based on Chinese species (Diptera: Drosophilidae), Journal of Natural History 51 (33 - 34), pp. 1943-1970 : 1956-1958

Stegana (Oxyphortica) dainuo Wang and Chen , sp. nov.

(Figures 2(g), 4(c), 5(h) and 9).

Diagnosis

This species is related to S. (O.) adentata Toda and Peng, 1992 from southern China in the shape of aedeagus in ventral view, but can be distinguished by having the aedeagus dorsally not protruded in lateral view ( Figure 9 (d)). In S. adentata : aedeagus protruded posterodorsally ( Toda and Peng 1992; figures 23 and 24). The 2.7% interspecific genetic distance to S. (O). laohlie sp. nov. is one of the smallest interspecific distances ascertained within this subgenus; see under that species.

Description

Clypeus dark brown to black. Palpus yellowish brown. Mesoscutum yellowish brown, brown to dark brown posteriomedially, with two pairs of thin, indistinct, brown longitudinal stripes sublaterally ( Figure 4 (c)). Scutellum mostly dark brown, yellow along margin, sometimes only at tip ( Figure 4 (c)). Katepisternum yellow. Wing yellow, brown anterodistally (Figure 2(g)). Abdominal tergites: 1st yellow; 2nd yellow medially, dark brown along posterior and lateral margins; 3rd to 5th mostly brownish to dark brown, yellow along anterior margins; 6th yellow medially, dark laterally ( Figure 5 (h)). Male terminalia: Epandrium nearly rectangular on posterolateral corners, with dense pubescence and setae ( Figure 9 (a)). Cercus lacking pubescence ( Figure 9 (a)). Surstylus small, lobe-shaped, only with several setae basally and apically ( Figure 9 (b)). Parameres absent ( Figure 9 (c, d)). Aedeagus sclerotized and bare dorsally, pubescent ventrally, apically slightly curved dorsad in lateral view, expanded outward on both sides of peristome ( Figure 9 (c, d)). Gonopods broadened, somewhat to hood-shaped ( Figure 9 (c, d)). Measurements

BL = 3.20 mm in holotype (range in two males and three females paratypes: 3.30– 3.33 mm in males, 3.75–4.13 mm in females), ThL = 1.57 mm (1.40–1.70 mm in males, 1.63–1.70 mm in females), WL = 2.77 mm (2.90–3.23 mm in males, 2.93–3.13 mm in females), WW = 1.20 mm (1.20–1.40 mm in males, 1.17–1.47 mm in females), arb = 6/4 (5–7/3–5), avd = 0.73 (0.67–0.91), adf = 1.88 (1.57–2.50), flw = 1.63 (1.67–2.50), FW/ HW = 0.37 (0.36–0.39), ch/o = 0.09 (0.09–0.12), prorb = 0.96 (0.80–0.96), rcorb = 0.61 (0.50–0.65), vb = 0.50 (0.40–0.63), dcl = 0.37 (0.40–0.43), presctl = 0.50 (0.25–0.49), sctl = damaged (1.02–1.26), sterno = 0.83 (0.70–0.78), orbito = 1.43 (1.57–1.80), dcp = 0.27 (0.24–0.29), sctlp = 0.78 (0.76–1.00), C = 2.45 (2.62–3.00), 4c = 0.85 (0.73– 0.87), 4v = 1.68 (1.59–1.78), 5x = 1.19 (1.00–1.44), ac = 5.00 (5.00–6.00), M = 0.40 (0.31– 0.54), C3F = 1.00 (1.00).

Type specimens

Holotype male ( SCAU, No. 124834), China: Mengdong, Cangyuan , Yunnan, altitude 1320 m, 7 May 2016, ex tussock, J Huang . Paratypes: China: three females ( SCAU, Nos. 124835–37), same data as holotype; two males ( SCAU, Nos. 124838–39), China: Husa, Longchuan , Yunnan, 24°27′37 ʹ ’N, 97°45′9 ʹ ’E, altitude 1200m, 20–21 August 2016, ex tussock, HW Chen .

Etymology

Derived from a girl name of the Jingpo nationality in Yunnan, China.

Distribution

China (Yunnan).

Figures

Figure 4. Dorsal view of thorax (same in male and female): (a) Stegana (Oxyphortica) maichouensis Sidorenko, 1998; (b) S. (O.) chuanjiangi Zhang and Chen, sp. nov.; (c) S. (O.) dainuo Wang and Chen, sp. nov.; (d) S. (O.) dawa Zhang and Chen, sp. nov.; (e) S. (O.) laohlie Zhang and Chen, sp. nov.; (f) S. (O.) luchun Wang and Chen, sp. nov.; (g) S. (O.) mengwan Wang and Chen, sp. nov.; (h) S. (O.) triodonta Cheng and Chen, sp. nov.

Figure 5. Abdominal tergites patterns (same in male and female): (a, b) Stegana (Oxyphortica) acutipenis Xu, Gao and Chen, 2007; (c) S. (O.) adentata Toda and Peng, 1992; (d) S. (O.) hirtipenis Xu, Gao and Chen, 2007; (e) S. (O.) latipenis Xu, Gao and Chen, 2007; (f) S. (O.) maichouensis Sidorenko, 1998; (g) S. (O.) chuanjiangi Zhang and Chen, sp. nov.; (h) S. (O.) dainuo Wang and Chen, sp. nov.; (i) S. (O.) dawa Zhang and Chen, sp. nov.

Figure 9. Stegana (Oxyphortica) dainuo Wang and Chen, sp. nov., male terminalia. (a) epandrium, cercus and surstylus (lateral view); (b) surstylus (ventral view); (c, d) hypandrium, aedeagus and aedeagal apodeme (ventral and lateral views); (e) gonopods. Scale lines = 0.1 mm.