Stegana (Steganina) acantha, Wu, Liang, Gao, Jian-Jun & Chen, Hong-Wei, 2010

Wu, Liang, Gao, Jian-Jun & Chen, Hong-Wei, 2010, The Stegana (Steganina) biprotrusa species group from the Oriental Region (Diptera: Drosophilidae), Zootaxa 2721, pp. 47-54 : 50

Stegana (Steganina) acantha sp. nov.

( Figs 4–9 )

Diagnosis. Articulating-to-aedeagus plate slightly sclerotized, with numerous, minute serrate processes ( Figs 6, 7 ); aedeagus bifurcated from base: ventral part broadened, divided submedolaterally; dorsal part broadened subapically, flat on apical margin ( Figs 6, 7 ).

Description. Male and female: Pedicel almost black, yellow medially. Mesonotum dark brown anteriorly, yellowish brown posteriorly. Basisternum brownish in male, black in female. Scutellum dark brown, yellow at tip in male, pale in female. Fore femur distally with 8 thick setae on anteroventral. All abdominal sternites dark brown, twice broad as the wide. Male terminalia: Epandrium with approximately 20 setae near posterior margin on each body-side ( Fig. 4 ). Tenth sternite concave ventrally and laterally, protruded dorsomedially ( Fig. 5 ). Hypandrium anteromedially concave ( Fig. 6 ). Gonopods round and with numerous, minute serrate processes distally ( Figs 8, 9 ).

Measurements. BL = 4.15 mm in the holotype (range in 131♀ paratypes: 4.10 mm in 3, 4.00 mm in ♀), THL = 2.10 mm (2.13 mm in 3, 2.05 mm in ♀), WL = 2.97 mm (3.06 mm in 3, 2.88 mm in ♀), WW = 1.50 mm (1.50 mm in 3, 1.50 mm in ♀), arb = 10/5 (8/5–9/5), avd = 0.64 (0.50–0.58), adf = 1.57 (1.09–1.56), flw = 2.14 (1.45– 1.67), FW/HW = 0.34 (0.37–0.41), ch/o = 0.19 (0.18–0.25), prorb = 0.94 (1.00–1.23), rcorb = 0.71 (0.71–0.78), vb = 0.44 (0.39–0.44), dc1 = 0.55 (0.48–0.55), presct1 = 0.50 (0.32–0.71), sct1 = 1.67 (1.52), sterno = 0.97 (0.82– 0.88), orbito = 1.82 (1.67–1.86), dcp = 0.20 (0.21–0.22), sct1p = 2.08 (2.30–3.13), C = 1.86 (2.00–2.03), 4c = 1.33 (1.16–1.18), 4v = 2.05 (1.72–1.82), 5x = 1.30 (1.14–1.30), ac = 18.70 (16.00–18.70), M = 0.62 (0.32–0.52), C3F = 0.83 (0.74–0.78).

Specimen examined. Holotype: 3 (SCAU, No. 120880), CHINA: Diaoluoshan, Lingshui, Hainan, 18°10′ N, 108°52′ E, altitude 800 m, 3.xii.2003, on tree trunk, HW Chen. Paratypes: CHINA: 131♀ (SCAU, Nos 120881, 82), same data as holotype; 131♀ (SCAU, Nos 120991, 92), Wuzhishan, Hainan, 18°20'N, 109°22'E, altitude 550m, 20.iv.2007, on tree trunks, HZ Cao, Li.

Distribution. China (Hainan).

Etymology. From the Greek word: acantha , referring to the articulating-to-aedeagus plate with minute serrate processes distally.

Figures

FIGURES 4 – 9. Stegana (Steganina) acantha sp. nov., 3: 4. Epandrium (epand), cercus (cerc) and surstylus (sur) (lateral view); 5. 10 th sternite (ventral view); 6, 7. hypandrium (hypd), aedeagus (aed), articulating-to-aedeagus plate (ap aed) and aedeagal apodeme (aed a) (ventral and lateral views); 8, 9. gonopods (ventral and lateral views) (scale bars: 0.1 mm).