Stegana, Meigen, 1830

Li, Tong, Cao, Huazhi, Gao, Jianjun & Chen, Hongwei, 2010, A revision of the subgenus Stegana (s. s.) (Diptera, Drosophilidae) from mainland China, Zoological Journal of the Linnean Society 158 (4), pp. 726-739 : 729-730

STEGANA ( STEGANA ) APICIPROCERA CAO & CHEN SP. NOV. ( FIGS 8–14 )

Specimens examined: Holotype male, China: Guangdong, Guangzhou, Huolushan , 5.iv.2004, ex tree trunk, MF Xu ( SCAU, no. 120274) . Paratypes: two females, same date and place as the holotype ( SCAU, no. 120275-76). One male, Hainan, Ledong, Jianfeng , 230 m, 1.xii.2003, ex tree trunk, HW Chen ( SCAU, no. 120277) .

Etymology: A combination of the Latin words apex and procerus, referring to the aedeagus apically protruding on posteromedian surface.

Diagnosis: Paramere entirely pubescent, lacking setae ( Fig. 11 ); aedeagus apically protruding on posteromedian surface ( Fig. 12 ).

Description: Male and female: frons yellow. First flagellomere black, yellow on basal quarter. Face yellow, brownish on lower margin. Clypeus brown. Mesonotum yellow, dark brown laterally, with two brown stripes sublaterally. Katepisternum white, with brown stripe on upper part. Scutellum brownish. Legs white; fore leg brown on knee; mid and hind legs dark brown on distal half of femora and basal third of tibiae. Fore femur with five setae on distal part of ventral surface. Abdomen with all tergites brown to dark brown, with median stripe and yellowish white patches laterally. Sternites black. Male terminalia: surstylus with one strong prensiseta on outer surface ( Fig. 9 ). Hypandrium somewhat sclerotized anterome- dially ( Fig. 10 ). Gonopods with one curved process posteromedially and two triangular processes submedially ( Figs 10, 12 ). Aedeagus with numerous tentacle-like setae along peristome and spine-like processes ventrally ( Figs 11, 12 ).

Measurements: BL = 2.33 mm in holotype (range one male and two female paratypes: 2.04 mm in male, 2.80–2.92 mm in females), ThL = 1.21 mm (1.18 mm in male, 1.43–1.45 mm in females), WL = 1.89 mm (1.70 mm in male, 2.20–2.21 mm in females), WW = 1.07 mm (1.00 mm in male, 1.13–1.20 mm in females). Indices: arb = 8/6 (8/7–9/6), avd = 0.80 (0.68– 0.73), adf = 2.00 (1.87–2.00), flw = 2.00 (1.90–2.09), FW/HW = 0.38 (0.36–0.39), ch/o = 0.10 (0.08–0.10), prorb = damaged (1.21–1.31), rcorb = 0.70 (0.82–0.91), vb = 0.28 (0.27–0.35), dcl = damaged (0.39–0.49), presctl = 0.68 (0.63–0.73), sctl = 1.70 (1.62–1.77), sterno = damaged (0.81–0.85), orbito = 1.83 (1.90– 2.26), dcp = 0.15 (0.15–0.20), sctlp = 1.29 (1.27–1.31), C = 1.86 (1.80–2.13), 4c = 1.33 (1.27–1.46), 4v = 2.08 (2.10–2.17), 5x = 1.05 (0.96–1.06), ac = 8.40 (6.42– 7.86), M = 0.56 (0.52–0.55), C3F = 0.71 (0.68–0.78).

Distribution: China (Guangdong, Hainan).

Figures

Figures 8–14. Stegana (Stegana) apiciprocera Cao & Chen sp. nov., 8–12, male; 13, 14, female: 8, epandrium, surstylus, and cercus; 9, surstylus; 10, hypandrium and gonopods; 11, parameres, aedeagus, and aedeagal apodeme; 12, hypandrium, gonopods, aedeagus, and aedeagal apodeme; 13, epiproct and cercus; 14, oviscapt and hypoproct. For orientation, see Figures 1–7. Scale bars = 0.1 mm.