Stegana (Steganina) menghai Zhang & 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 : 84

Stegana (Steganina) menghai Zhang & Chen , sp. nov.

( Figs. 11E, 11F, 50)

Diagnosis. This species slightly resembles S. (S.) nigridentata sp. nov. in the shape of epandrium, surstylus, cercus ( Figs. 50A, 55A), and subepandrial sclerite ( Figs. 50F, 55F), but can be distinguished from the latter by having the small pregonite with 4 sensilla ( Fig. 50B, C); the aedeagus with numerous minute, serrated processes distally ( Fig. 50B, C); the aedeagal sheath distally cambered, not strongly expanded ( Fig. 50D, E).

Description. Male and female: First flagellomere black. Clypeus yellow. Mesonotum broadly dark brown medially, brown laterally ( Fig. 11E). Katepisternum mostly yellowish, brownish on anterior corner ( Fig. 11F). Scutellum dark brown, yellow at tip ( Fig. 11E). Halter mostly grey ( Fig. 11F). Fore femur with a row of 3 long setae on distal part of posteroventral surface. Abdominal tergites black ( Fig. 11E, F); sternites brown, about 2 times as wide as long. Male terminalia ( Fig. 50): Epandrium with ca. 14 setae on dorsal to posterior portions per side ( Fig. 50A). Surstylus with 1 peg-like tooth, several setulae, and some pubescence near distal margin ( Fig. 50A). Cercus with much pubescence ( Fig. 50A). Hypandrium roundly expanded anteromedially ( Fig. 50B, C). Aedeagus roundly expanded distally, lacking pubescence ( Fig. 50B, C). Aedeagal sheath with numerous minute, serrated processes distally ( Fig. 50D, E). Subepandrial sclerite vaulted, roundly expanded dorsally ( Fig. 50F).

Measurements and indices. BL = 3.00 mm in holotype (3.07 in 2♁, 2.93–3.67 in 5♀ paratypes), ThL = 1.47 mm (1.33 in ♁, 1.27–2.27 in ♀), WL = 2.00 mm (2.33 in ♁, 2.20–2.60 in ♀), WW = 1.00 mm (1.20 in ♁, 1.00– 1.27 in ♀), arb = 6/3 (7–8/3–5), avd = 0.89 (0.80–1.60), adf = 1.13 (0.63–1.25), flw = 1.63 (1.20–1.75), FW/HW = 0.38 (0.32–0.48), ch/o = 0.28 (0.24–0.40), prorb = 1.50 (0.71–1.25), rcorb = 0.80 (0.56–0.81), vb = 0.40 (0.27–0.36), dcl = 0.57 (0.32–0.57), presctl = 0.63 (0.50–0.71), sctl = 2.73 (1.43–3.50), sterno = 0.95 (0.65–0.87), orbito = 2.00 (2.00–2.50), dcp = 0.21 (0.20–0.34), sctlp = 2.00 (1.88–2.78), C = 1.90 (1.60–1.83), 4c = 1.25 (1.11–1.38), 4v = 1.88 (1.78–2.25), 5x = 2.00 (1.67–1.75), ac = 6.67 (6.50–12.00), M = 1.00 (0.56–0.88), C3F = 0.80 (0.67–0.82).

Type materials. Holotype ♁ ( SCAU, No. 125641, DNA #1433), CHINA: Hesong, Menghai , Yunnan, 21°50'17''N, 100°05'48''E, alt. 1600m, 7.v.2012, ex tree trunk, H.W. Chen . Paratypes: 5♀ ( SCAU, Nos. 125642–46, DNA #2657), other data same as holotype ; 2♁, 1♀ ( SCAU, Nos. 125647–49, DNA #2732), Botanic Garden, Ruili , Yunnan, 24°04'19''N, 97°49'08''E, alt. 1150m, 22.iv.2018, ex tree trunks, H.W. Chen .

Distribution. China (Yunnan).

Etymology. From the name of the type locality "Menghai".