Pseudostegana silvana, Li & Gao & Chen, 2010

Li, Tong, Gao, Jianjun & Chen, Hongwei, 2010, Six new species of the genus Pseudostegana (Diptera: Drosophilidae) from the Oriental region, Journal of Natural History 44 (23 - 24), pp. 1401-1418 : 1416-1417

publication ID	https://doi.org/ 10.1080/00222931003679584
persistent identifier	https://treatment.plazi.org/id/03D55018-3779-FF99-FE2F-64403DC202FD
treatment provided by	Felipe
scientific name	Pseudostegana silvana
status	sp. nov.

Treatment

Pseudostegana silvana View in CoL sp. nov.

( Figures 1G,H View Figure 1 ; 20; 8)

Diagnosis

Paramere subapically roundly expanded in lateral view, lacking any projections ( Figure 8E View Figure 8 ); aedeagus smoothly narrowed on distal one-third ( Figure 8D,E View Figure 8 ).

Description

Only important characters are described here.

Head. Ocellar triangle dark brown. Frons brown. Pedicel brown; first flagellomere greyish brown on basal two-thirds, greyish black on distal one-third. Face mostly dark brown, with one small yellow patch. Palpus black, yellow at tip, broad, large in male, medially half as wide as long. Clypeus black. Gena brown.

Thorax. Scutum yellow on anterior two-thirds, dark brown on posterior one-third. Pleura brownish yellow on upper part, black on lower part. Katepisternal setae two. Scutellum brownish yellow, pale at tip.

Legs. Yellow, black on hind tibia.

Abdomen. Tergites yellow first and second, glossy black on the rest. Sternites brown to black in male; male fifth with a few long setae on posterior margin.

Male terminalia. Epandrium roundly protruded on ventral margin, with about 20 setae ( Figure 8A View Figure 8 ). Surstylus protruded on antero- and posteroventral corners ( Figure 8B View Figure 8 ). Cercus ventrally round ( Figure 8A,C View Figure 8 ). Basal process of aedeagus slender ( Figure 8E View Figure 8 ).

Measurements

BL = 2.68 mm in holotype (range in five male paratypes: 2.28–2.90 mm), ThL = 1.09 mm (1.00– 1.31 mm), WL = 2.30 mm (2.15–2.34 mm), WW = 1.00 mm (0.91–1.13 mm), arb = 5/1 (6/1–7/1), avd = 0.93 (0.70–1.50), adf = 1.75 (1.50–2.00), flw = 2.40 (2.00–2.60), FW/HW = 0.44 (0.38–0.42), ch/o = 0.09 (0.09), prorb = 1.00 (0.75–0.89), vb = 0.80 (0.50–0.81), dcl = damaged (0.21–0.29), sctl = 1.36 (1.11–1.36), sterno = 0.75 (0.61–0.64), orbito =0.60 (0.50–0.72), dcp = 0.19 (0.18–0.21), sctlp = 1.30 (1.00–1.50), C = 1.85 (1.67–1.85), 4c = 1.75 (1.64–2.00), 4v = 3.30 (2.90– 3.50), 5x = 0.94 (1.00–1.28), ac = 11.6 (12.70–15.60), M = 0.63 (0.57–0.75), C3F = 0.81 (0.71–0.79).

Type material

Holotype male ( SCAU No.120561), Mount Diaoluo , Lingshui, Hainnan, 18°10′ N, 108°52′ E, altitude 1000 m, 22 May 2004, swept over fallen logs and tussock, H.W. Chen GoogleMaps . Paratypes: China: eight males and eight females (four males and four females in KIZ; four males and four females in SCAU, Nos. 120562–69), same data as holotype except 16, 17 May 2005, 23, 24 April 2008, H.L. Cao, H.W. Chen, X.P. Chen, J.J. Gao, M.F. Xu GoogleMaps ; ten males and five females (five males and three females in KIZ; five males and females in SCAU, Nos. 120573–79), Mount Jianfengling, Ledong , Hainan, 18°41′ N, 108°52′ E, altitude 800 m, 20 May 2004, 20 April 2008, swept over fallen logs and over tussock, H.W. Chen, X.P. Chen, J.J. Gao GoogleMaps ; two males, one female ( SCAU, Nos. 120570–72), Mount Atuoling, Wuzhishan , Hainan, 18°20′ N, 109°22′ E, altitude 550 m, 20 April 2007, swept over fallen logs, T. Li GoogleMaps .