Stegana (Steganina) bibarbata 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 : 44

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

( Figs. 4G, 4H, 19)

Diagnosis. This species differs from the other species of the nigrolimbata species group in having the yellow body color ( Fig. 4G, H); the surstylus slightly triangular, lacking scale-like process ( Fig. 19A, B); the aedeagal sheath not expanded distolaterally, with some minute, serrated processes ( Fig. 19E, F).

Description. Male: Frons yellowish brown, lacking black band. First flagellomere yellow. Face black, with 1 yellow band medially. Clypeus black medially, yellow laterally. Palpus yellow basally, dark brown distally. Gena narrow and yellow. Mesonotum and scutellum mostly yellow ( Fig. 4G). Katepisternum yellowish above, brownish below ( Fig. 4H). Halter brownish basally, grey distally ( Fig. 4H). Fore femur with 4 thin, long setae on distal part of posteroventral surface. Abdominal tergites yellow ( Fig. 4G, H); sternites brownish, slightly wider than long. Male terminalia ( Fig. 19): Epandrium with ca. 28 setae on dorsal to posterolateral portions per side ( Fig. 19A). Surstylus with numerous setae near margin, lacking pubescence ( Fig. 19A, B). Cercus lacking pubescence ( Fig. 19A). Hypandrium expanded anteromedially ( Fig. 19C, D). Pregonite blurry or absent ( Fig. 19C, D). Aedeagus with much pubescence basally ( Fig. 19C, D). Phallapodeme (aedeagal apodeme in McAlpine 1981) podgy ( Fig. 19C, D).

Measurements and indices. BL = 2.93 mm in holotype, ThL = 1.46 mm, WL = 2.64 mm, WW = 1.28 mm, arb = 6/3, avd = 0.67, adf = 1.31, flw = 1.95, FW/HW = 0.36, ch/o = 0.10, prorb = 0.32, rcorb = 0.75, vb = 0.49, dcl = 0.61, presctl = 0.50, sctl = 1.17, sterno = 0.71, orbito = 1.58, dcp = 0.29, sctlp = 1.50, C = 1.78, 4c = 1.15, 4v = 1.55, 5x = 0.95, ac = 10.20, M = 0.44, C3F = 0.65.

Type material. Holotype ♁ ( SCAU, No. 125407, DNA #2460), CHINA: Husa, Longchuan , Yunnan, 24°28'21''N, 97°54'06''E, alt. 1340m, ex tree trunk, 7.xi.2017, H.W. Chen.

Distribution. China (Yunnan).

Etymology. A combination of the Latin words " bi -" (= two) and " barbatus " (= beard), referring to the pair of long, filar processes of aedeagus.