Stegana (Steganina) bimai Cui & 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 : 57-59

Stegana (Steganina) bimai Cui & Chen , sp. nov.

( Figs. 6E, 6F , 29 )

Diagnosis. This species closely resembles S. (S.) clavispinula Chen & Chen, 2009 in the shape of epandrium, surstylus, cercus (as figs. 1, 2 in Chen & Chen 2009, Fig. 29A, B ), and aedeagal sheath in ventral view (as fig. 6 in Chen & Chen 2009, Fig. 29E ), but can be distinguished from the latter by having the surstylus with 1 peg-like tooth near distal margin ( Fig. 29B ); the aedeagus expanded distally in ventral view ( Fig. 29D ), lacking serrated process in median process ( Fig. 29C, D ); the subepandrial sclerite slightly X-shaped ( Fig. 29G ).

Description. Male and female: First flagellomere brown. Clypeus yellow. Mesonotum brown medially, yellow laterally ( Fig. 6E ). Scutellum brown, yellow along margin ( Fig. 6E ). Katepisternum yellowish ( Fig. 6F ). Halter mostly grey ( Fig. 6F ). Fore femur with 3 thin, long setae on distal part of posteroventral surface. Abdominal tergites brown ( Fig. 6E, F ); sternites brownish, about 2 times as wide as long in male, about 3 times as wide as long in female. Male terminalia ( Fig. 29 ): Epandrium with ca. 15 setae on dorsal to posterior portions per side ( Fig. 29A ). Surstylus slightly squared, with minute, serrated processes distally and several setulae near distal margin ( Fig. 29A, B ). Cercus lacking pubescence ( Fig. 29A ). Hypandrium expanded anteromedially ( Fig. 29C, D ). Pregonite small, with 3 sensilla ( Fig. 29C, D ). Aedeagus with some pubescence distoventrally ( Fig. 29C ). Aedeagal sheath with several minute, serrated processes distally ( Fig. 29E, F ).

Measurements and indices. BL = 2.63 mm in holotype (2.52–2.61 in 2♂, 2.48–2.65 in 2♀ paratypes), ThL = 1.31 mm (1.31–1.34 in ♂, 1.26–1.28 in ♀), WL = 2.32 mm (2.28–2.51 in ♂, 2.31–2.61 in ♀), WW = 1.00 mm (0.97–1.01 in ♂, 0.95–1.08 in ♀), arb = 6/4 (7/4–5), avd = 0.65 (0.84–0.93), adf = 1.12 (1.08–1.20), flw = 2.12 (1.87–2.39), FW/HW = 0.40 (0.36–0.44), ch/o = 0.26 (0.24–0.27), prorb = 0.68 (0.87–1.07), rcorb = 0.71 (0.60– 0.71), vb = 0.60 (0.61–0.89), dcl = damaged (0.55–0.72), presctl = damaged (0.46–0.66), sctl = 2.19 (2.17–2.89), sterno = 0.39 (0.47–0.93), orbito = 1.80 (1.80–1.98), dcp = 0.30 (0.28–0.36), sctlp = 1.78 (1.50–1.73), C = 1.67 (1.72–1.98), 4c = 1.17 (1.22–1.28), 4v = 1.83 (1.88–2.19), 5x = 1.81 (1.44–1.86), ac = 15.17 (9.00–13.14), M = 0.74 (0.61–0.71), C3F = 0.55 (0.60–0.64).

Type materials. Holotype ♂ ( SCAU, No. 125744, DNA #2706), CHINA: Muyiji Park, Ximeng , Yunnan, 22°37'23''N, 99°36'11''E, alt. 1100m, 16.iv.2018, ex tree trunk, L. Zhu . Paratypes: 2♀ ( SCAU, Nos. 125745, 46), other data same as holotype; 2♂ ( SCAU, Nos. 125747, 48, DNA #2727), Menglun, Mengla , Yunnan, 21°47'29''N, 101°22'59''E, alt. 860m, 24.xii.2003, ex tree trunk, H.W. Chen.

Distribution. China (Yunnan).

Etymology. From the word " bimai " in Dai language from the Dai nationality living in Yunnan, China, referring to the Water-Sprinkling Festival (new year).

Figures

FIGURE 6. Head, thorax, and abdomen in dorsal and lateral views: A, B. Stegana (Steganina) alafoliacea Zhang & Chen, sp. nov.; C, D. S. (S.) baoxing Li & Chen, sp. nov.; E, F. S. (S.) bimai Cui & Chen, sp. nov.; G, H. S. (S.) cinereipecta Zhang & Chen sp. nov.; I, J. S. (S.) cordhirsuta Wang & Chen, sp. nov.

FIGURE 29. Stegana (Steganina) bimai Cui & 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.