Stegana (Oxyphortica) gonglui Wang and Chen, 2018

Huang, Jia, Wang, Nan-Nan, Zhang, Yuan & Chen, Hong-Wei, 2018, Stegana (Oxyphortica) convergens species group (Diptera: Drosophilidae) from the Oriental region, with morphological and molecular evidence, Journal of Natural History 52 (21 - 24), pp. 1473-1492 : 1484-1485

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

( Figures 4 (d) and 6)

Diagnosis

This species strongly resembles S. apicopubescens Cheng et al. 2010 in male terminalia, but can be distinguished from the latter by surstylus and colour patterns of abdominal tergites; surstylus with 1 prensiseta dorsally and 2 projections posteroventrally ( Figure 6 (b), prs); abdominal 2nd to 6th tergites yellow medially, dark brown laterally, 2nd to 4th tergites lacking narrow caudal band ( Figure 4 (d)). In S. apicopubescens : surstylus with 2 prensisetae dorsally and 2 projections posteroventrally (as in Cheng et al. 2010, fig. 6); abdominal 3rd to 5th tergites each with narrow caudal band ( Figure 3 (a,b)).

Description

Male and female: Frons mostly brownish. Face yellow. Clypeus brown. Palpus yellow. Mesoscutum yellow medially, greyish yellow laterally. Scutellum greyish yellow. Pleura mostly with brown longitudinal stripe below base of wing and halter, yellow below. Abdominal 5th and 6th tergites each with narrow caudal band ( Figure 4 (d)); all abdominal sternites yellow.

Measurements

BL = 2.83 mm in the holotype (in 5 male and 5 female paratypes: 2.33 – 3.27 mm in males, 2.60 – 3.78 mm in females), THL = 1.43 (1.00 – 1.57 in males, 1.17 – 1.63 in females), WL = 2.40 (1.97 – 2.50 in males, 2.27 – 2.80 in females), WW = 1.07 (0.87 – 1.30 in males, 1.07 – 1.17 in females), arb = 7/5 (5 – 7/3 – 5), avd = 0.80 (0.55 – 0.92), adf = 2.14 (1.50 – 2.20), flw = 2.00 (1.50 – 2.20), FW/HW = 0.39 (0.29 – 0.40), ch/o = 0.20 (0.13 – 0.18), prorb = 2.00 (0.89 – 1.38), rcorb = 1.00 (0.56 – 0.88), vb = 0.50 (0.33 – 0.60), dcl = 0.53 (0.36 – 0.57), presctl = 0.47 (0.36 – 0.69), sctl = 1.38 (0.73 – 1.38), sterno = 0.78 (0.44 – 1.17), orbito = 2.00 (1.33 – 2.50), dcp = 0.31 (0.25 – 0.33), sctlp = 1.00 (0.75 – 1.10), C = 2.82 (2.33 – 3.50), 4c = 0.89 (0.64 – 0.93), 4v = 1.84 (1.40 – 2.07), 5x = 1.43 (1.00 – 1.33), ac = 3.78 (3.40 – 5.00), M = 0.53 (0.38 – 0.53), C3F = 0.86 (0.80 – 0.89).

Type specimens

Holotype male ( SCAU, No. 124557), CHINA: Husa, Longchuan, Yunnan, China , 24.450°N, 97.750°E, altitude 1230 m, 20 August 2016, swept over tree trunk, L Gong . Paratypes: 9 males ( KIZ, Nos. 0088090 – 98) and 27 males, 4 females ( SCAU, Nos. 124558 – 78), swept over tussock and tree trunks, HW Chen, L Gong, YQ Liu, other data same as holotype; 2 males ( SCAU, Nos. 124579, 80), Nabang, Yingjiang, Yunnan, 24.667°N, 97.583°E, altitude 700 m, 19 August 2016, swept over tussock, HW Chen, YQ Liu; 2 males, 1 female ( SCAU, Nos. 124581 – 83), Botanic Garden Ruili , Yunnan, 24.017°N, 97.850°E, altitude 1170 m, 22 August 2016, swept over tussock, HW Chen, L Gong .

Etymology

Patronym after the collector Mr Lu Gong (SCAU).

Distribution

China (Yunnan).

Figures

Figure 3. Colour patterns of abdominal tergites: (a,b) Stegana (Oxyphortica) apicopubescens; (c,d) S. (O.) apicosetosa; (e) S. (O.) convergens; (f–i) S. (O.) mediospinosa.

Figure 4. Colour patterns of abdominal tergites: (a–c) Stegana (Oxyphortica) setifrons; (d) S. (O.) gonglui sp. nov.; (e) S. (O.) xiaoyangae sp. nov.; (f–h) S. (O.) zhulinae sp. nov.; (i) colour legend for Figures 3 and 4.

Figure 6. Stegana (Oxyphortica) gonglui Wang and Chen,sp.nov., male terminalia: (a) epandrium,cercus and surstylus; (b) surstylus with two projections (prs) posteroventrally; (c, d) hypandrium, parameres, gonopods, aedeagus and aedeagal apodeme (ventral and lateral views). Scale bars: 0.1 mm.