Stegana (Steganina) minutiflava Li & Chen

WANG, YA-LIAN, LI, BING-XUE, CUI, MENG-DI, ZHANG, YUAN, WANG, LE, ZHANG, CAI-HONG, TSAUR, SHUN-CHERN, CHEN, HONG-WEI & HUANG, JIA, 2023, Revision of the subgenus Stegana (Steganina) from China, with assessment of species delimitation using DNA barcodes (Diptera, Drosophilidae), Zootaxa 5250 (1), pp. 1-109 : 86-87

Stegana (Steganina) minutiflava Li & Chen , sp. nov.

( Figs. 11I, 11J , 52 )

Diagnosis. This species is similar to S. (S.) cylindrica Wang, Gao, & Chen, 2013 in the shape of male terminalia (as fig. 2 in Wang et al. 2013, Fig. 52 ), but can be distinguished from the latter by having the surstylus lacking peg-like tooth ( Fig. 52A, B ); the cercus with much pubescence ( Fig. 52A ); the aedeagus tubular, lacking pubescence ( Fig. 52C, D ); the aedeagal sheath lacking serrated process ( Fig. 52E, F ).

Description. Male and female: First flagellomere brown. Clypeus brownish in male, brown in female. Mesonotum brownish yellow medially, yellow laterally ( Fig. 11I ). Katepisternum yellowish ( Fig. 11J ). Scutellum brown, yellow at tip in male ( Fig. 11I ), brown to black in female. Halter mostly grey ( Fig. 11J ). Fore femur with a row of 3 long setae on distal part of posteroventral surface. Abdominal tergites medially brownish in male, black in female, yellow laterally ( Fig. 11I, J ); sternites yellow, about 1.3 times as wide as long. Male terminalia ( Fig. 52 ): Epandrium with ca. 15 setae on dorsal to posterior portions per side ( Fig. 52A ). Surstylus with some setulae near distal margin, lacking pubescence ( Fig. 52A, B ). Hypandrium strongly expanded anteromedially ( Fig. 52C, D ). Pregonite small, with 2 sensilla ( Fig. 52C, D ). Aedeagus lacking serrated process ( Fig. 52C, D ). Subepandrial sclerite expanded dorsally ( Fig. 52G ).

Measurements and indices. BL = 2.75 mm in holotype (2.57–2.99 in 3♂, 2.54–3.14 in 4♀ paratypes), ThL = 1.21 mm (1.39–1.49 in ♂, 1.32–1.56 in ♀), WL = 2.61 mm (2.47–2.61 in ♂, 2.31–3.05 in ♀), WW = 1.23 mm (0.99–1.01 in ♂, 1.01–1.12 in ♀), arb = 6/4 (9–6/6–4), avd = 0.78 (0.69–0.95), adf = 1.14 (0.85–1.30), flw = 2.28 (1.54–2.00), FW/HW = 0.37 (0.35–0.38), ch/o = 0.33 (0.24–0.31), prorb = 0.90 (0.86–1.34), rcorb = 0.68 (0.61–0.79), vb = 0.59 (0.52–0.77), dcl = 0.28 (0.28–0.64), presctl = 0.38 (0.38–0.85), sctl = 2.00 (1.66–2.56), sterno = damaged (0.80–0.96), orbito = 2.33 (1.66–2.00), dcp = 0.17 (0.16–0.21), sctlp = 1.92 (1.59–2.15), C = 1.70 (1.50–1.95), 4c = 1.20 (1.03–1.26), 4v = 1.83 (1.60–2.06), 5x = 1.63 (1.02–1.48), ac = 9.18 (10.22–14.43), M = 0.62 (0.47–0.72), C3F = 0.60 (0.57–0.68).

Type materials. Holotype ♂ ( SCAU, No. 125660, DNA #1874), CHINA: Yixiang, Pu'er , Yunnan, 22°44'19''N, 101°07'01''E, alt. 1420m, 13.v.2012, ex tree trunk, H.W. Chen . Paratypes: 1♂ ( SCAU, No. 125662, DNA #816), Diaoluoshan, Lingshui , Hainan, 18°43'51''N, 109°51'28''E, alt. 980m, 18.v.2005, ex tree trunk, H.W. Chen; 1 ♂, 1♀ ( SCAU, Nos. 125663, 64, DNA #2650), Jinshan, Menglian , Yunnan, 22°19'29''N, 99°35'00''E, alt. 940m, 3.iv.2018, ex tree trunks, H.W. Chen; 1♂, 2♀ ( SCAU, Nos. 125665–67, DNA #2698), Botanic Garden, Ruili , Yunnan, 24°04'19''N, 97°49'08''E, alt. 1150m, 22.iv.2018, ex tree trunks, H.W. Chen, L. Gong ; 1♀ ( SCAU, No. 125661, DNA #2726), Yunjishan, Xinfeng , Guangdong, 24°05'19''N, 114°10'42''E, alt. 530m, 9.xi.2019, ex tree trunk, Z.Q. Peng.

Distribution. China (Guangdong, Hainan, Yunnan).

Etymology. A combination of the Latin words " minutus " (= minute) and " flavus " (= yellow), referring to the small body size and the yellow body color.

Figures

FIGURE 11. Head, thorax, and abdomen in dorsal and lateral views: A, B. Stegana (Steganina) magniflava Cui & Chen, sp. nov.; C, D. S. (S.) mailangang Li & Chen, sp. nov.; E, F. S. (S.) menghai Zhang & Chen, sp. nov.; G, H. S. (S.) menglian Li & Chen, sp. nov.; I, J. S. (S.) minutiflava Li & Chen, sp. nov.

FIGURE 52. Stegana (Steganina) minutiflava Li & Chen, sp. nov., male terminalia.A. Epandrium, surstylus, and cercus in lateral view; B. Surstylus in ventral view; C, D. Hypandrium, pregonite, aedeagus, and phallapodeme in ventral and lateral views; E, F. Aedeagal sheath in ventral and lateral views; G. Subepandrial sclerite in ventral view.