Stegana (Oxyphortica) chuanjiangi Zhang 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 : 1953-1956

Stegana (Oxyphortica) chuanjiangi Zhang and Chen , sp. nov.

(Figures 2(f), 4(b), 5(g) and 8).

Diagnosis

Aedeagus strongly broadened mediolaterally, wider than long, not bifid apically ( Figure 8 (c, d)). The 3.9% interspecific genetic distance to S. (O). dawa sp. nov. is one of the smallest interspecific distances ascertained within this subgenus; see under that species.

Description

Clypeus brownish yellow. Palpus yellow. Mesoscutum yellow medially, with two pairs of broad, brown to dark brown longitudinal stripes sublaterally ( Figure 4 (b)). Scutellum brown to dark brown medially, yellow along margin ( Figure 4 (b)). Katepisternum yellow, slightly brownish anteriorly. Wing greyish basally, greyish brown distally, posterior crossvein and neighbouring longitudinal veins darkened (Figure 2(f)). Abdominal tergites: 1st yellow; 2nd and 3rd yellow medially, dark brown posterolaterally, anteromedially with one small brownish patch on 2nd; 4th to 6th tergites mostly dark brown, yellow along anterior margins, with brownish yellow to yellow longitudinal stripes medially ( Figure 5 (g)). Male terminalia: Epandrium nearly rectangular on posterolateral corners, with dense pubescence and setae ( Figure 8 (a)). Cercus lacking pubescence ( Figure 8 (a)). Surstylus small lobe-shaped, only with several setae distally ( Figure 8 (a, b)). Parameres absent ( Figure 8 (c, d)). Aedeagus dorsally sclerotized, apically slightly curved ventrad in lateral view, with sparse pubescence ventrally and one pair of small projections above peristome, slightly expanded outward on both sides of peristome ( Figure 8 (c, d)). Gonopods broadened to hood-shaped, not bilobed apically ( Figure 8 (e)).

Measurements

BL = 3.00 mm in holotype (range in five males and five females paratypes: 2.73–3.69 mm in males, 3.87–4.36 mm in females), ThL = 1.40 mm (1.33–1.73 mm in males, 1.42– 1.78 mm in females), WL = 2.70 mm (2.63–3.10 mm in males, 3.33–3.56 mm in females), WW = 1.13 mm (1.20–1.33 mm in males, 1.38–1.60 mm in females), arb = 4/3 (4–6/3–4), avd = 0.71 (0.67–1.00), adf = 2.00 (1.63–3.00), flw = 2.43 (1.83–2.60), FW/HW = 0.37 (0.34– 0.47), ch/o = 0.12 (0.09–0.13), prorb = 0.89 (0.75–1.12), rcorb = 0.68 (0.57–0.78), vb = 0.62 (0.45–0.62), dcl = 0.52 (0.46–0.58), presctl = 0.48 (0.41–0.50), sctl = 1.11 (1.00–1.27), sterno = 0.89 (0.81–0.96), orbito = 1.60 (1.29–2.00), dcp = 0.27 (0.21–0.37), sctlp = 1.00 (0.82–1.08), C = 2.78 (2.62–3.06), 4c = 0.74 (0.73–0.82), 4v = 1.70 (1.50–1.86), 5x = 1.38 (1.22–1.57), ac = 5.67 (5.00–6.67), M = 0.48 (0.42–0.55), C3F = 1.00 (1.00).

Type specimens

Holotype male ( SCAU, No. 121037), China: Hesong, Menghai , Yunnan, 21°49 ʹ N, 100°06 ʹ E, altitude 1750–1900 m, 17 April 2010, ex tussock, JJ Gao . Paratypes: China: 24 males, 18 females (six males, five females in KIZ, Nos. 0088137–47; 18 males, 13 females in SCAU, Nos. 121038– 52, 121479–94), 17 April 2010, 27 March 2011, 7 April 2011, 7–12 May 2012, same data as holotype, HW Chen, JJ Gao, JM Lu, ZF Shao, YR Su, L Wang, L Wu, SJ Yan, CJ Zhou; four females ( SCAU, Nos. 121053–56), Wangtianshu , Mengla , Yunnan, 21°28 ʹ N, 101°38 ʹ E, altitude 570 m, 22–24 April 2007, ex tussock, HW Chen, JJ Gao; two females ( SCAU, Nos. 121057, 58), Wuliangshan, Jingdong, Yunnan, 24°32 ʹ N, 101°01 ʹ E, altitude 1450 m, 5 August 2006, ex tussock, T Li; four males, three females ( SCAU, Nos. 122024–30), Baihualing, Baoshan, Yunnan, 25°27′N, 98°52′E, altitude 1400 m, 14 June 2011, 24 August 2013, ex tussock, HW Chen, JJ Gao, QS Gao; three males, three females ( SCAU, Nos. 124813–15, 111311–13), Mengdong, Cangyuan, Yunnan, 23°10′8 ʹ ’N, 99°13′52 ʹ ’E, altitude 1300 m, 6–10 May 2016, ex tussock, J Huang, YQ Liu, YL Wang; two males, one female ( SCAU, Nos. 123016–18), Nanling, Lincang, Yunnan, 22°47 ʹ 57 ʹ ’N, 99°55 ʹ 11 ʹ ’E, altitude 1860 m, 12 August 2016, ex tussock, HW Chen, L Gong .

Etymology

Patronym after Dr Chuanjiang Zhou (Henan Normal University), who helped us many times in the field.

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 8. Stegana (Oxyphortica) chuanjiangi Zhang 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.