Stegana (Stegana) polyrhopalia, 2010

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 : 732-733

STEGANA (STEGANA) POLYRHOPALIA CAO & CHEN SP. NOV. ( FIGS 22–28 )

Specimens examined: Holotype male, China: Hainan, Ledong, Jianfengling , 700 m, 16.v. 2005, ex tussock, MF Xu ( SCAU, no. 120281) . Paratypes: one male and one female, same data and place as holotype ( SCAU, no. 120282-83) .

Etymology: A combination of the Greek words polys and rhopalon, referring to the aedeagus with numerous rod-like processes apically.

Diagnosis: First flagellomere entirely black. Parameres strongly sclerotized, fused to each other from basal third, with a few sensilla on basal third ( Figs 25, 26 ); aedeagus with c. 16 pairs of short rodlike processes apically ( Figs 25, 26 ).

Description: Frons black, with yellow band submedially in male, entirely yellow in female. Face dark brown, with yellow band submedially in male, entirely yellow in female. Clypeus black in male, brown in female. Mesonotum and scutellum dark brown to black in male, brown in female. Katepisternum brown on upper part, white on lower part. Legs yellowish white, fore leg brown on knee; mid and hind leg black each on medial two-thirds and on distal half of femora; all tibiae with two black rings each basally and distally. Fore femur with four setae on distal part of ventral surface. Abdomen with all tergites dark brown to black in male, brown in female. Sternites black. Male terminalia: surstylus with one strong prensiseta on outer surface ( Fig. 23 ). Hypandrium strongly sclerotized anteromedially ( Fig. 24 ). Gonopods with one triangular process posteromedially and two sub-basal processes per side ( Fig. 26 ). Aedeagus membranous ventrally, sclerotized dorsally ( Figs 25, 26 ). Female terminalia: hypoproct with numerous peg-like processes and a few setae, lacking pubescence ( Fig. 28 ).

Measurements: BL = 2.13 mm in holotype (one male and one female paratypes: 2.43 mm in male, 2.43 mm in female), ThL = 1.13 mm (1.13 mm in male, 1.28 mm in female), WL = 1.83 mm (1.78 mm in male, 2.07 mm in female), WW = 0.98 mm (1.05 mm in male, 1.12 mm in female). Indices: arb = 9/5 (9/6–9/7), avd = 0.87 (0.66–0.72), adf = 1.50 (1.64–1.75), flw = 2.00 (2.00–2.02), FW/HW = 0.30 (0.33–0.36), ch/o = 0.07 (0.06), prorb = 1.33 (1.15–1.19), rcorb = 1.00 (0.84-damaged), vb = 0.22 (0.25–0.26), dcl = 0.38 (damaged), presctl = 0.58 (damaged), sctl = 1.47 (damaged), sterno = 0.81 (0.76 – damaged), orbito = 2.33 (2.50–2.67), dcp = 0.20 (0.22–0.25), sctlp = 1.11 (1.00–1.11), C = 1.98 (1.89–2.02), 4c = 1.21 (1.16– 1.28), 4v = 1.64 (1.64–1.82), 5x = 0.94 (1.11–1.14), ac = 7.83 (7.82–9.09), M = 0.44 (0.51), C3F = 0.64 (0.65–0.70).

Distribution: China (Hainan).

Figures

Figures 22–28. Stegana (Stegana) polyrhopalia Cao & Chen sp. nov., 22–26, male; 27, 28, female: 22, epandrium, surstylus, and cercus; 23, surstylus; 24, hypandrium and gonopods; 25, parameres, aedeagus, and aedeagal apodeme; 26, hypandrium, gonopods, paramere, aedeagus, and aedeagal apodeme; 27, epiproct and cercus; 28, oviscapt and hypoproct. For orientation, see Figures 1–7. Scale bars = 0.1 mm.