Stegana (Steganina) alafoliacea 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 : 55-56

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

( Figs. 6A, 6B , 27 )

Diagnosis. This species is similar to S. (S.) baoxing sp. nov. in the dark body color ( Fig. 6A–D ), but can be distinguished from the latter by having the surstylus with numerous minute, serrated processes on outer surface ( Fig. 27A ); the aedeagus strongly expanded apicolaterally in ventral view ( Fig. 27B ); the aedeagal sheath with numerous minute, serrated processes ( Fig. 27D, E ).

Description. Male: First flagellomere black. Clypeus black. Mesonotum and scutellum dark brown ( Fig. 6A , as wide as long. Male terminalia ( Fig. 27 ): Epandrium with ca. 5 setae on dorsal to posterior portions per side ( Fig. 27A ). Surstylus curved submedially, with 1 peg-like tooth and several setulae distally ( Fig. 27A ). Cercus with much pubescence ( Fig. 27A ). Hypandrium expanded anteromedially ( Fig. 27B, C ). Pregonite blurry or absent ( Fig. 27B, C ). Aedeagal sheath erect, slightly dorsad curved ( Fig. 27D, E ). Subepandrial sclerite deeply split medially ( Fig. 27F ).

Measurements and indices. BL = 2.35 mm in holotype, ThL = 1.27 mm, WL = 2.00 mm, WW = 0.93 mm, arb = 7/4, avd = 1.60, adf = 1.25, flw = 2.50, FW/HW = 0.45, ch/o = 0.10, prorb = 1.22, rcorb = 0.67, vb = 0.75, dcl = 0.73, presctl = 0.28, sctl = 1.80, sterno = 0.80, orbito = 2.00, dcp = 0.20, sctlp = 1.71, C = 1.88, 4c = 1.33, 4v = 1.83, 5x = 1.67, ac = 8.00, M = 0.83, C3F = 0.63.

Type material. Holotype ♂ ( SCAU, No. 125631, DNA #1459), CHINA: Maoershan, Xingan , Guangxi, 25°51'28''N, 110°25'01''E, alt. 700m, 17.x.2004, ex tree trunk, H.W. Chen.

Distribution. China (Guangxi).

Etymology. A combination of the Latin words " alaris " (= alary) and '' foliaceus " (= foliaceous), referring to the apicolaterally strongly extended aedeagus.

Figures

FIGURE 6. Head, thorax, and abdomen in dorsal and lateral views: A, B. Stegana (Steganina) alafoliacea Zhang & Chen, sp. nov.; C, D. S. (S.) baoxing Li & Chen, sp. nov.; E, F. S. (S.) bimai Cui & Chen, sp. nov.; G, H. S. (S.) cinereipecta Zhang & Chen sp. nov.; I, J. S. (S.) cordhirsuta Wang & Chen, sp. nov.

FIGURE 27. Stegana (Steganina) alafoliacea Zhang & Chen, sp. nov., male terminalia.A. Epandrium, surstylus, and cercus in lateral view; B, C. Hypandrium, aedeagus, and phallapodeme in ventral and lateral views; D, E. Aedeagal sheath in ventral and lateral views; F. Subepandrial sclerite in ventral view.