Stegana (Steganina) unguiculata, 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 : 100-102

Stegana (Steganina) unguiculata sp. nov.

( Figs 2H , 11 )

Diagnosis. This species resembles S. linnanensis Cheng, Gao & Chen, 2009 from southern China in the colour patterns of body ( Fig. 2H ) and male terminalia ( Fig. 11 ), but can be distinguished from it by the aedeagus nearly bilobed, with 7 pair of slender processes and thick, long pubescence laterally ( Fig. 11C ); gonopods with 1 suberect lobe-like process bearing several pubescence ( Fig. 11D ). However, the minimum interspecific genetic distance is 3.3% to S. hirtifoliacea ( Table 2).

Description. Male and Female: Pedicel brown medially, black laterally; first flagellomere nearly black. Palpus yellow basally, brown on distal 1/ 3 in male, brown on distal 2/ 3 in female. Mesonotum dark brown medially, brown laterally ( Fig. 2H ). Katepisternum dark brown on upper part, white-yellow on lower part ( Fig. 2H ). Scutellum black ( Fig. 2H ). Legs dark brown to black, yellow on basal part of fore femora and 2nd to 5th tarsomeres. Fore femur with 3 long setae on distal half of posteroventral surface. All abdominal tergites brown ( Fig. 2H ); all sternites yellowish brown. Male terminalia ( Fig. 11 A–E): Epandrium with approximately 22 setae near posterior portion per side. Surstylus broad in lateral view. Cercus lacking pubescence. Tenth sternite with 1 pair of asymmetric projection sublaterally. Plate between hypandrium and aedeagus with 4 sensilla. Aedeagus composed of 1 bilobed medial process with pubescence. Female terminalia ( Fig. 11 F–H): Epiproct and cercus with setae, lacking pubescence. Hypoproct pubescent medially, with dense setae along lateral and posterior margins. Eighth sternite glabrous, with a pair of small setae near posterior margin.

Measurements. BL = 2.83 mm in holotype (mm in five ♂ and five ♀ paratypes: 2.37–2.83 in ♂, 2.87–3.27 in ♀), ThL = 1.17 mm (1.20–1.30 in ♂, 1.20–1.47 in ♀), WL = 1.83 mm (1.93–2.17 in ♂, 2.00– 2.23 in ♀), WW = 1.00 mm (1.00– 1.10 in ♂, 1.07–1.17 in ♀), arb = 7/5 (7–9/5–6), avd = 0.90 (0.60–0.92), adf = 1.67 (1.11–1.83), flw = 2.17 (1.57–2.50), FW/HW = 0.46 (0.34–0.44), ch/o = 0.10 (0.09–0.16), prorb = 0.94 (1.00–1.27), rcorb = 0.59 (0.60–0.91), vb = 0.29 (0.18–0.31), dc1 = damaged (0.31–0.48), presctl = damaged (0.55–0.71), sct1 = 2.00 (1.40– 1.90), sterno = 1.00 (0.85–1.25), orbito = 2.25 (1.67–2.50), dcp = 0.29 (0.17–0.36), sct1p = 1.30 (1.09–1.42), C = 1.89 (1.71–2.06), 4c = 1.20 (1.00–1.29), 4v = 1.60 (1.50–1.81), 5x = 1.50 (1.18–1.54), ac = 9.00 (7.00–10.05), M = 0.60 (0.43–0.67), C3F = 0.39 (0.50–0.74).

Specimens examined. Holotype: ♂ ( SCAU, No. 111477), China: Qimaba, Lüchun , Yunnan, 22°49'8''N, 102°17'25''E, altitude 1280m, 3,4. viii.2016, tree trunk, HW Chen . Paratypes: China: 3♂, 7♀ ( SCAU, Nos 111478 – 7), same data as holotype, HW Chen, L Gong, YQ Liu ; 1♀ ( SCAU, No. 111488), Dashuigou, Lühun , Yunnan, 22°57'19''N, 101°57'4''E, altitude 1310m, 2.viii.2016, tree trunk, HW Chen ; 1♂, 1♀ ( SCAU, Nos 111540, 41), Jinshan Forest Park, Menglian , Yunnan, 22°20'6''N, 99°34'34''E, altitude 1049m, 24.x.2017, tree trunks, HW Chen, L Gong ; 1♂, 1♀ ( KIZ, Nos 0 0 90663, 64), Moli Forest Park, Ruili , Yunnan, 24°7'5''N, 97°58'51''E, altitude 920m, 5.xi.2017, tree trunks, HW Chen, L Gong ; 1♀ ( SCAU, No. 124146), Beibeng, Motuo , Xizang, 29°19'N, 95°20'E, altitude 800m, 29.ix.2010, tree trunk, L Wang .

Etymology. From the Latin word: unguiculus, referring to the aedeagus with claw-shape processes. Distribution. China (Yunnan, Xizang).

Figures

FIGURE 2. Habitus. A. Stegana (Steganina) toyaensis Okada & Sidorenko, 1992; B–J in holotype: B. Stegana (Steganina) latitabula sp. nov.; C. Stegana (Steganina) panda sp. nov.; D. Stegana (Steganina) pinguifoliacea sp. nov.; E. Stegana (Steganina) spatulata, sp. nov.; F. Stegana (Steganina) stachydifolia, sp. nov.; G. Stegana (Steganina) hirtifoliacea sp. nov.; H. Stegana (Steganina) unguiculata sp. nov.; I. Stegana (Steganina) biflava sp. nov.; J. Stegana (Steganina) flavivittata sp. nov.

FIGURE 11. Stegana (Steganina) unguiculata sp. nov., male terminalia: A. Epandrium, surstylus and cercus (lateral view); B. Surstylus (inner view); C. Hypandrium, parameres, aedeagus and aedeagal apodeme (ventral view); D. Gonopods (ventral view); E. Tenth sternit (ventral view); F. Epiproct (epi) and cercus (cerc) (dorsal view); G. Hypoproct (ventral view); H. Eighth sternite (ventral view). Scale lines = 0.1 mm.