Pseudostegana linyongi, 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 : 2113-2115

Pseudostegana linyongi sp. nov.

( Figures 4 (m–r) and 10)

Diagnosis

This species differs from the other known species of this group in yellow body colour, the paramere protruding bearing three acute projections on distal one-third ( Figure 10 (c)), and the aedeagus distally strongly expanded dorsad, with strong basal process ( Figure 10 (b,c)). The 13.4% interspecific genetic distance to P. latifasciata is the smallest

within this group; there are 11 diagnostic sites between P. linyongi sp. nov. and P. latifasciata ( Figure 2).

Description

Male and female. Head ( Figure 4 (m,p)): Ocellar triangle yellow, narrowly elongated to anterior margin of frons. Frons, pedicel, first flagellomere, face, gena yellow. Clypeus brownish yellow. Palpus yellow, broad, large in male, medially half as wide as long. black. Thorax ( Figure 4 (n,q)): Scutum nearly yellow, sublaterally with thin longitudinal stripes. Pleura yellow above, brownish below. Katepisternal setae two. Scutellum brownish yellow. Wing ( Figure 4 (o)): Medial band greyish. Legs: Yellow. Abdomen ( Figure 4 (r)): All tergites and sternites nearly yellow. Male terminalia ( Figure 10): Epandrium roundly protruding on ventral margin, with about 18 setae per side. Surstylus protruding on posteroventral corner. Cercus ventrally slightly protruding. Paramere: apical process bifurcated, with two long sensilla; lateral process with two small projections and with numerous sensilla on dorsal projection. Aedeagus apically strongly curved dorsad, with several thin finger-like projections.

Measurements

BL = 2.93 mm in holotype (range in two female paratypes: 3.40–4.07), ThL = 1.27 mm (1.46–1.50), WL = 2.73 mm (3.47–3.67), WW = 1.10 mm (1.33–1.43), arb = 7/1 (6–8/1), avd = 1.09 (1.00), adf = 1.57 (1.44–1.88), flw = 1.71 (1.44–1.63), FW/HW = 0.43 (0.44), ch/ o = 0.06 (0.08), prorb = damaged (damaged), rcorb = damaged (damaged), vb = 0.71 (0.81–0.90), dcl = 0.32 (0.19), sct1 = damaged (1.07), sterno = damaged (0.56–0.67), orbito = 0.57 (0.55–0.70), dcp = 0.19 (0.13), sct1p = 0.91 (1.23–1.58), C = 2.00 (2.00–2.35), 4c = 1.50 (1.30–1.61), 4v = 2.88 (2.60–2.94), 5x = 1.38 (0.90–1.20), ac = 24.00 (12.5–13.00), M = 0.65 (0.58–0.60), C3F = 0.75 (0.74–0.77).

Type material

Holotype male ( SCAU, No. 111426), China: Dafengding, Mabian , Sichuan, 28.628°N, 103.357° E, altitude 1547 m, 26 June 2017, ex tree trunk, L. Gong . Paratypes: two females ( SCAU, Nos. 111427–28), altitude 1270 m, 27 June 2017, ex tussock, Y . Lin, same data as holotype .

Etymology

Patronym of the collector Mr Yong Lin (SCAU).