Stegana (Steganina) albiventralis, Cheng, Gao & Chen, 2009

Cheng, Yu, Gao, Jian-Jun & Chen, Hong-Wei, 2009, Stegana ornatipes species group from the Oriental Region (Diptera: Drosophilidae), Zootaxa 2216 (1), pp. 37-48 : 40-41

Stegana (Steganina) albiventralis sp. nov.

( Figs 1–6 )

Specimens examined. Holotype: ♂ ( SCAU, No. 120589), CHINA: Ailaoshan, Jingdong, Simao , Yunnan, 24°50ʹ N, 100°48ʹ E, altitude 2400 m, 31.vii.2006, on tree trunks, HZ Cao . Paratypes: CHINA: 6♂ ( SCAU, Nos 120590-95), same data as holotype ; 7♂ 6♀ ( SCAU, Nos 120596-0608), Wuliangshan, Nanjian, Dali , Yunnan, 24°28ʹ N, 100°40ʹ E, altitude 2200 m, 27–28.vii.2006, on tree trunks, HL Cao, HZ Cao, T Li ; 15♂ 11♀ (5♂ 5♀ in KIZ; 8♂ 4♀ in SCAU, Nos 120609-0620; 2♂ 2♀ in SEHU), Wuliangshan, Jingdong, Simao , Yunnan, 24°31ʹ N, 101°40ʹ E, altitude 2230 m, 4,5. viii.2006, on tree trunks, HL Cao, HZ Cao, T Li .

Diagnosis. Palpus entirely yellow; katepisternum entirely white; aedeagus divided into several slender, rod-like processes from base ( Fig. 4 ).

Description. Male and female: Pedicel and first flagellomere brown. Mesonotum brown, with yellow stripe medially. Scutellum black. Legs white-yellow, black on all knee joints and basal part of all 1st tarsomeres. Fore femur with 4 setae on distal part of ventral surface. All abdominal tergites dark brown to black. Sternites yellow. Male terminalia: Epandrium with approximately 14 setae near posterior margin on each body-side ( Fig. 1 ). Cercus with sporadic pubescence ( Fig. 1 ). Plate between hypandrium and aedeagus lacking pubescence ( Fig. 4 ).

Measurements. BL = 2.56 mm in holotype (range in 4♂ 5♀ paratypes: 2.72–3.09 mm in ♂, 2.88–3.16 mm in ♀); ThL = 1.47 mm (1.34–1.53 mm in ♂, 1.56–1.69 mm in ♀); WL = 2.84 mm (2.38–2.91 mm in ♂, 2.75–3.03 mm in ♀); WW = 1.44 mm (1.26–1.44 mm in ♂, 1.40–1.42 mm in ♀). Indices: arb = 7/6 (6–7/6–7), avd = 0.77 (0.67–0.80), adf = 1.08 (0.93–1.29), flw = 1.58 (1.50–1.64), FW/HW = 0.42 (0.38–0.40), ch/o = 0.09 (0.08–0.09), prorb = 1.08 (1.04–1.19), rcorb = 0.72 (0.69–0.81), vb = 0.25 (0.21–0.28), dcl = 0.51 (0.36– 0.42), presctl = 0.67 (0.47–0.63), sctl = 1.34 (1.25–1.51), sterno = 0.92 (0.89–0.98), orbito = 2.14 (2.00–2.50), dcp = 0.25 (0.18–0.23), sctlp = 1.04 (1.12–1.48), C = 2.10 (1.90–2.10), 4c = 1.14 (1.08–1.27), 4v = 1.66 (1.63–1.79), 5x = 1.29 (1.29–1.54), ac = 10.00 (9.00–10.50), M = 0.51 (0.50–0.59), C3F = 0.63 (0.51–0.71).

Distribution. China (Yunnan).

Etymology. A combination of the Latin words: albulus and ventriculus, referring to the mesopleuron white below black longitudinal stripe.

Figures

FIGURES 1–6. Stegana (Steganina) albiventralis sp. nov., ♀: 1–4 male terminalia, 5, 6 female terminalia. 1. Epandrium (epand), surstylus (sur) and cercus (cerc) (lateral view); 2. surstylus (frontal view); 3. 10th sternite (ventral view); 4. hypandrium (hypd), gonopods (gon), aedeagus and aedeagal apodeme (ventral view); 5. epiproct (epi) and cercus (cerc) (dorsal view); 6. 8th sternite (ovi) and hypoproct (hypo) (Scale bars: 0.1 mm).