Stegana (Steganina) menglian 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 : 85-86

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

( Figs. 11G, 11H , 51 )

Diagnosis. This species is similar to S. (S.) lancang sp. nov. in the shape of male terminalia ( Figs. 46A–G , 51 ), but can be distinguished from the latter by having the surstylus lacking serrated process ( Fig. 51A, B ); the aedeagus lacking a row of serrated processes distoventrally ( Fig. 51C, D ).

Description. Male and female: First flagellomere yellowish brown. Clypeus yellow. Mesonotum dark brown medially, brown laterally ( Fig. 11G ). Katepisternum mostly yellowish, brownish on anterior corner ( Fig. 11H ). Scutellum dark brown, yellow at tip ( Fig. 11G ). Halter mostly white ( Fig. 11H ). Fore femur with a row of 3 long setae on distal part of posteroventral surface. Abdominal tergites black ( Fig. 11G, H ); sternites brown, about 2 times as wide as long. Male terminalia ( Fig. 51 ): Epandrium with ca. 14 setae on dorsal to posterior portions per side ( Fig. 51A ). Surstylus with 1 peg-like tooth and some setulae near distal margin, lacking pubescence ( Fig. 51A, B ). Cercus with much pubescence ( Fig. 51A ). Hypandrium roundly expanded anteromedially ( Fig. 51C, D ). Pregonite with 2 sensilla ( Fig. 51C, D ). Aedeagus roundly expanded distally, with several minute, serrated processes distolaterally and some pubescence distoventrally ( Fig. 51C, D ). Aedeagal sheath distally strongly dorsad curved and with several minute, serrated processes ( Fig. 51E, F ). Subepandrial sclerite nearly vaulted ( Fig. 51G ).

Measurements and indices. BL = 2.21 mm in holotype (2.43 in 1♂, 2.73–2.79 in 2♀ paratypes), ThL = 1.08 mm (1.21 in ♂, 1.32–1.36 in ♀), WL = 2.09 mm (2.12 in ♂, 2.46–2.52 in ♀), WW = 0.88 mm (0.91 in ♂, 0.99–1.04 in ♀), arb = 7/4 (5–6/3–4), avd = 0.84 (0.77–0.88), adf = 0.97 (1.11–1.26), flw = 1.77 (1.73–1.93), FW/HW = 0.40 (0.41–0.45), ch/o = 0.30 (0.25–0.27), prorb = 1.18 (1.04–1.20), rcorb = 0.78 (0.57–0.71), vb = 0.71 (0.71–0.72), dcl = 0.74 (0.53–0.80), presctl = 0.67 (0.47–0.88), sctl = 1.44 (1.57–1.92), sterno = 0.79 (0.60–0.85), orbito = 1.46 (1.19–1.40), dcp = 0.30 (0.32–0.37), sctlp = 1.92 (1.41–1.79), C = 1.68 (1.62–1.82), 4c = 1.10 (1.30–1.36), 4v = 1.42 (1.86–2.07), 5x = 1.55 (1.34–1.50), ac = 10.86 (9.18–10.22), M = 0.70 (0.62–0.65), C3F = 0.61 (0.55–0.62).

Type materials. Holotype ♂ ( SCAU, No. 125725, DNA #2673), CHINA: Jinshan, Menglian, Yunnan, 22°19'29''N, 99°35'00''E, alt. 940m, 25.x.2017, ex tree trunk, H.W. Chen. Paratypes: 1♀ (SCAU, No. 125726, DNA #2692), other data same as holotype; 1♂, 1♀ ( SCAU, Nos. 125727, 28, DNA #2720), Longtan Park, Ximeng , Yunnan, 22°38'55''N, 99°36'02''E, alt. 1150m, 17.iv.2018, ex tree trunks, L. Gong, Y. Lin.

Distribution. China (Yunnan).

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

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 46. Stegana (Steganina) lancang Li & Chen, sp. nov., male (A–G) and female terminalia (H–J). 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; H. Epiproct and cercus in dorsal view; I. Eighth sternite in ventral view; J. Hypoproct in ventral view.

FIGURE 51. Stegana (Steganina) menglian 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.