Stegana (Steganina) radiciflava 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 : 92

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

( Figs. 12I, 12J, 57)

Diagnosis. This species closely resembles S. (S.) kanmiyai Okada & Sidorenko, 1992 in the shape of male terminalia (as fig. 3E–G in Okada & Sidorenko 1992, Fig. 57), but can be distinguished from the latter by having the surstylus with 1 peg-like tooth near distal margin, lacking seta ( Fig. 57A); the hypandrium only slightly expanded anteromedially ( Fig. 57B, C); the pregonite small, with 2 sensilla ( Fig. 57B, C); the aedeagus rounded distally ( Fig. 57B, C).

Description. Male: First flagellomere yellow on basal 2/3, brown on distal 1/3. Clypeus brownish medially, yellow laterally. Mesonotum dark brown medially, yellow laterally ( Fig. 12I). Katepisternum yellowish ( Fig. 12J). Scutellum dark brown, yellow at tip ( Fig. 12I). Halter mostly white ( Fig. 12J). Fore femur with a row of 5 long setae on distal part of posteroventral surface. Abdominal tergites dark brown to black ( Fig. 12I, J); sternites black, about 2 times as wide as long. Male terminalia ( Fig. 57): Epandrium with ca. 17 setae on dorsal to posterior portions per side ( Fig. 57A). Surstylus with numerous minute, serrated processes, lacking pubescence ( Fig. 57A). Cercus with much pubescence ( Fig. 57A). Pregonite small, with 2 sensilla ( Fig. 57B, C). Aedeagus distally rounded and with numerous symmetric, serrated processes distally ( Fig. 57B, C). Subepandrial sclerite deeply split medially ( Fig. 57D).

Measurements and indices. BL = 3.67 mm in holotype, ThL = 1.53 mm, WL = 2.80 mm, WW = 1.33 mm, arb = 8/5, avd = 0.63, adf = 1.00, flw = 1.50, FW/HW = 0.39, ch/o = 0.33, prorb = 0.61, rcorb = 0.78, vb = 0.50, dcl = 0.39, presctl = 0.61, sctl = 1.82, sterno = 0.75, orbito = 2.00, dcp = 0.17, sctlp = 2.42, C = 1.86, 4c = 1.40, 4v = 2.20, 5x = 2.00, ac = 7.00, M = 1.00, C3F = 0.79.

Type material. Holotype ♁ ( SCAU, No.125635, DNA #1434), CHINA: Hesong, Menghai , Yunnan, 21°50'17''N, 100°05'48''E, alt. 1600m, 12.v.2012, ex tree trunk, H.W. Chen.

Distribution. China (Yunnan).