Stegana (Steganina) cornuta 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 : 61

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

( Figs. 7A, 7B , 32 )

Diagnosis. This species closely resembles S. (S.) angulistrata Wu & Chen, 2010 in the shape of male terminalia (as fig. 1–6 in Wu & Chen 2010, Fig. 32 ), but can be distinguished from the latter by having the aedeagus medially lacking serrated process but mediolaterally with a pair of horned processes ( Fig. 32C, D ); the aedeagal sheath distally slender and strongly dorsad curved ( Fig. 32E, F ).

Description. Male and female: First flagellomere brown. Clypeus yellow. Mesonotum yellow ( Fig. 7A ). Katepisternum yellowish ( Fig. 7B ). Scutellum yellow ( Fig. 7A ). Halter mostly grey ( Fig. 7B ). Fore femur with a row of 3 or 4 long setae on distal part of posteroventral surface. Abdominal tergites brown to dark brown ( Fig. 7A, B ); sternites brown, slightly wider than long. Male terminalia ( Fig. 32 ): Epandrium with ca. 9 setae on dorsal to posterior portions per side ( Fig. 32A ). Surstylus with 1 prensiseta, several setulae, and serrated processes near distal margin ( Fig. 32A, B ). Cercus lacking pubescence ( Fig. 32A ). Hypandrium expanded anteromedially ( Fig. 32C, D ). Pregonite small, with 2 sensilla ( Fig. 32C, D ). Aedeagus rounded distally, with numerous minute, serrated processes laterally and much pubescence distoventrally and sublaterally ( Fig. 32C, D ). Aedeagal sheath with some minute, serrated processes distally ( Fig. 32E, F ). Subepandrial sclerite slightly vaulted, split medially ( Fig. 32G ).

Measurements and indices. BL = 3.00 mm in holotype (2.34–3.04 in 4♂, 2.88–3.44 in 5♀ paratypes), ThL = 1.48 mm (1.21–1.46 in ♂, 1.29–1.80 in ♀), WL = 2.32 mm (2.31–2.59 in ♂, 2.43–2.72 in ♀), WW = 1.20 mm (0.97–1.09 in ♂, 0.91–1.24 in ♀), arb = 9/5 (6–9/4–6), avd = 0.83 (0.76–0.93), adf = 1.50 (0.91–1.29), flw = 2.50 (1.74–2.16), FW/HW = 0.48 (0.27–0.46), ch/o = 0.17 (0.26–0.37), prorb = 1.50 (0.53–1.41), rcorb = 0.70 (0.59– 1.16), vb = 0.56 (0.46–1.22), dcl = 0.33 (0.43–0.69), presctl = 0.57 (0.39–0.63), sctl = 2.23 (1.47–2.27), sterno = 0.64 (0.53–0.96), orbito = 1.40 (1.67–1.98), dcp = 0.28 (0.16–0.39), sctlp = 1.89 (1.55–2.08), C = 1.74 (1.53–2.13), 4c = 1.55 (1.06–1.38), 4v = 2.40 (1.36–2.10), 5x = 1.50 (1.06–2.00), ac = 15.50 (8.36–17.55), M = 0.75 (0.58–0.72), C3F = 0.81 (0.56–0.71).

Type materials. Holotype ♂ ( SCAU, No. 125586, DNA #1414, 2665), 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: 2♂, 5♀ ( SCAU, Nos. 125587–93, DNA #1414, 1939, 2665, 2702), 1♂, 1♀ on 28–30.iii.2013, J.J. Gao, other data same as holotype; 1♂ ( SCAU, No. 125594, DNA #2173), Mengdong, Cangyuan , Yunnan, 23°10'08''N, 99°13'52''E, alt. 1320m, 10.v.2016, ex tree trunk, J. Huang.

Distribution. China (Yunnan).

Figures

FIGURE 7. Head, thorax, and abdomen in dorsal and lateral views: A, B. Stegana (Steganina) cornuta Li & Chen, sp. nov.; C, D. S. (S.) cucullata Li & Chen, sp. nov.; E, F. S. (S.) cultella Cui & Chen, sp. nov.; G, H. S. (S.) curvitabulata Cui & Chen, sp. nov.; I, J. S. (S.) daiya Cui & Chen, sp. nov.

FIGURE 32. Stegana (Steganina) cornuta 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.