Stegana (Steganina) pinguifoliacea, 2019

Li, Bingxue, Zhang, Yuan & Chen, Hongwei, 2019, Nine new species of the subgenus Stegana (Steganina) from China, with DNA barcoding information (Diptera: Drosophilidae), Zootaxa 4576 (1), pp. 81-108 : 94-95

Stegana (Steganina) pinguifoliacea sp. nov.

( Figs 2D, 7)

Diagnosis. This species resembles S. longifibula Takada, 1968 in some characters of the body colour patterns ( Fig. 2D), but can be distinguished by the male terminalia, in this species, the surstylus without minute projections, except acute apically ( Fig. 7A); aedeagus medially expanded in lateral view, strongly narrowed in ventrally ( Fig. 7B, C); gonopods nearly vaulted in ventral view ( Fig. 7D). The minimum interspecific genetic distance to S. longifibula is 4.3%, which is smaller than to other species ( Table 2).

Description. Male: Frons black. First flagellomere greish yellow. Clypeus and palpus yellow. Mesonotum brown to dark brown, with 1 thin, unconspicuous, yellow longitudinal stripe medially, yellowish brown laterally. Katepisternum entirely white. Scutellum black. Femur of foreleg with 4 long erect setae near distal part of posteroventral surface. Abdominal tergites nearly black. Male terminalia ( Fig. 7): Epandrium slightly protruded ventrally, with ca. 15 setae on posterior portion per side. Surstylus with numerous setulae distally. Cercus lacking pubescence. Paramere with 2 setulae. Tenth sternite flat dorsolaterally.

Measurements. BL = 3.01 mm in holotype, ThL = 1.47 mm, WL = 2.95 mm, WW = 1.26 mm, arb = 6/4, avd = 0.62, adf = 1.36, flw = 1.87, FW/HW = 0.41, ch/o = 0.22, prorb = 1.30, rcorb = 0.73, vb = 0.52, dc1 = damaged, presct1 = damaged, sct1 = damaged, sterno = damaged, orbito = 1.73, dcp = 0.35, sct1p = 1.68, C = 2.08, 4c = 1.02, 4v = 1.55, 5x = 1.26, ac = 9.25, M = 0.45, C3F = 0.65.

Specimens examined. Holotype ♂ ( SCAU, No. 110944), China: Pangquangou, Jiaocheng , Shanxi, 37°04'47''N, 111°30'20''E, altitude 2200m, 30.vii.2016, tree trunk, L Zhu.

Etymology. A combination of the Latin words: pinguis and foliaceous, reference to the aedeagus medially expanded in lateral view.