Pseudostegana bingxueae, Gong & Chen, 2018

Gong, Lu & Chen, Hongwei, 2018, Seven new species of the genus Pseudostegana (Diptera: Drosophilidae) from South-west China, with DNA barcoding information, Journal of Natural History 52 (31 - 32), pp. 2097-2119 : 2111-2112

Pseudostegana bingxueae sp. nov.

( Figures 4 (a–f) and 8)

Diagnosis

This species is most closely related to P. nitidifrons Chen and Wang in Chen et al. (2005) from Yunnan, China in the slender palpus ( Figure 4 (a)) and wing pattern ( Figure 4 (c)), but can be distinguished from it by the male terminalia: in this species, paramere apically acute ( Figure 8 (b,c)); aedeagus apically hook-like, curved dorsad in lateral view ( Figure 8 (c)). The interspecific genetic distance to P. nitidifrons is 12.0%, but to P. husaensis sp. nov. 11.0% is the smallest within this group; there are 10 diagnostic sites between P. bingxueae sp. nov. and P. nitidifrons , and four diagnostic sites between P. bingxueae sp. nov. and P. husaensis sp. nov ( Figure 2).

Description

Male. Head ( Figure 4 (a,d)): Ocellar triangle brown, slightly narrowly elongated to anterior margin of frons. Frons brown. Pedicel yellow; first flagellomere greyish yellow. Face yellow. Clypeus medially black, brown laterally. Gena brownish. Palpus brownish and slender. Thorax ( Figure 4 (b,e)): Scutum anteriorly brown and with thin medial stripe, posteriorly black. Pleura nearly black. Katepisternal setae two. Scutellum brown, pale at tip. Legs: Pale yellow, brown on fore leg femur, black on mid and hind legs femora and tibiae. Abdomen ( Figure 4 (f)): First and second tergites dark brown medially, the rest black. Sternites brown on second and third, dark brown on the rest. Male terminalia ( Figure 8): Epandrium slightly roundly protruding on ventral margin, with about 17 setae per side. Surstylus protruding on posteroventral corner. Cercus ventrally broadened. Paramere subapically with three long sensilla and submedially several sensilla on dorsal projection. Aedeagus submedially expanded in lateral view. Basal process long with about 10 finger-like projections.

Measurements

BL = 2.80 mm, ThL = 1.08 mm, WL = 1.85 mm, WW = 1.00 mm, arb = 7/1, avd = 0.80, adf = 1.67, flw = 2.00, FW/HW = 0.43, ch/o = 0.05, prorb = 1.20, rcorb = 0.16, vb = 0.82, dcl = 0.27, sct1 = 1.07, sterno = damaged, orbito = 0.58, dcp = 0.28, sct1p = 1.60, C = 1.96, 4c = 1.50, 4v = 3.00, 5x = 1.83, ac = 16.67, M = 0.71, C3F = 0.64.

Type material

Holotype male ( SCAU, No. 111422), China: Moli Forest Park, Ruili , Yunnan, 24.118°N, 97.981°E, altitude 920 m, 5 November 2017, ex tussock, B.X. Li.

Etymology

Patronym of the collector Ms Bingxue Li (SCAU).

Distribution

China (Yunnan).