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)

stylus, 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

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).