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.

Figures

FIGURE 19. Stegana (Steganina) bibarbata Li & Chen, sp. nov., male terminalia. A. Epandrium, surstylus, and cercus in lateral view; B. Surstylus in lateral view; C, D. Hypandrium, aedeagus, and phallapodeme in ventral and lateral views; E, F. Aedeagal sheath in ventral view.

FIGURE 1-4. An un-rooted, neighbor-joining (NJ) tree constructed using 435 DNA barcode sequences of 102 Steganina species. Numbers around the nodes are bootstrap percentages (BPs). BPs lower than 50 are not shown. The bars indicate the estimated number of substitutions per site.