Stegana (Steganina) mailangang 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 : 83-84

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

( Figs. 11C, 11D, 49)

Diagnosis. This species slightly resembles S. (S.) cyclophylla Chen & Chen, 2009 in the shape of hypandrium, pregonite, and subepandrial sclerite (as figs. 9–11 in Chen & Chen 2009, Fig. 49C, D, G), but can be distinguished from the latter by having the aedeagus distally with some minute, serrated processes ( Fig. 49C, D); the aedeagal sheath lacking serrated process ( Fig. 49E, F).

Description. Male: First flagellomere black. Clypeus yellow. Mesonotum black medially, dark brown laterally ( Fig. 11C). Katepisternum yellowish ( Fig. 11D). Scutellum black ( Fig. 11C). Halter mostly black ( Fig. 11D). Fore femur with a row of 3 long setae on distal part of posteroventral surface. Abdominal tergites black ( Fig. 11C, D); sternites brown, about 2 times as wide as long. Male terminalia ( Fig. 49): Epandrium with ca. 14 setae on dorsal to posterior portions per side ( Fig. 49A). Surstylus with 1 peg-like tooth near distal margin and some setulae distally, lacking pubescence ( Fig. 49A, B). Cercus with much pubescence ( Fig. 49A). Hypandrium roundly expanded anteromedially ( Fig. 49C, D). Pregonite fused with hypandrium, with 3 sensilla ( Fig. 49C, D). Aedeagus roundly expanded distally, with some pubescence distoventrally ( Fig. 49C, D). Subepandrial sclerite vaulted, expanded dorsally ( Fig. 49G).

Measurements and indices. BL = 2.77 mm in holotype, ThL = 1.33 mm, WL = 2.75 mm, WW = 1.32 mm, arb = 7/5, avd = 0.68, adf = 1.35, flw = 1.78, FW/HW = 0.34, ch/o = 0.23, prorb = 1.21, rcorb = 0.97, vb = 1.45, dcl = 0.59, presctl = 0.49, sctl = 1.55, sterno = 0.76, orbito = 1.78, dcp = 0.30, sctlp = 1.69, C = 2.18, 4c = 1.14, 4v = 1.95, 5x = 1.65, ac = 8.09, M = 0.72, C3F = 0.69.

Type material. Holotype ♁ ( SCAU, No. 125694, DNA #2623), CHINA: Wangtianshu, Mengla , Yunnan, 21°36'09''N, 101°35'06''E, alt. 660m, 17.xii.2017, ex tree trunk, H.W. Chen.

Distribution. China (Yunnan).

Etymology. From the word " mailangang " in Dai language from the Dai nationality living in Yunnan, China, referring to the meaning of the type locality (Wangtianshu: sky tree).