Stegana (Steganina) lancang 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 : 79-80

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

( Figs. 10E, 10F , 46 )

Diagnosis. This species is similar to S. (S.) kanmiyai Okada & Sidorenko, 1992 in the shape of male terminalia (as fig. 3E–G in Okada & Sidorenko 1992, Fig. 46A–G ), but can be distinguished from the latter by having the brownish yellow body color ( Fig. 10E, F ); the surstylus with 1 peg-like tooth near distal margin ( Fig. 46A, B ); the aedeagus lacking pubescence distolaterally ( Fig. 46C, D ).

Description. Male: Clypeus and palpus yellow. Mesonotum brownish yellow ( Fig. 10E ). Katepisternum yellowish ( Fig. 10F ). Scutellum brownish yellow, brownish near distal margin ( Fig. 10E ). Halter mostly grey ( Fig. 10F ). Fore femur with a row of 3 strong setae on distal part of posteroventral surface. Abdominal tergites brownish yellow ( Fig. 10E, F ); sternites yellow, about 2 times as wide as long. Male terminalia ( Fig. 46A–G ): Epandrium with 13 setae on dorsal to posterior portions per side ( Fig. 46A ). Surstylus with numerous setulae distally and some minute, serrated processes distoventrally ( Fig. 46C, D ). Aedeagal sheath acute apically, with 1 pair of acute processes subapically ( Fig. 46E, F ). Subepandrial sclerite vaulted ( Fig. 46G ). Female terminalia ( Fig. 46H–J ): Epiproct with several setae on distal 1/3 ( Fig. 46H ). Cercus and hypoproct with numerous setae and much pubescence ( Fig. 46H, J ). Eight sternite about 2 times as long as wide, mostly glabrous except with some setae distally ( Fig. 46I ).

Measurements and indices. BL = 2.74 mm in holotype (2.33–2.67 in 5♂, 2.39–2.73 in 4♀ paratypes), ThL = 1.32 mm (1.21–1.31 in ♂, 1.21–1.37 in ♀), WL = 2.48 mm (2.16–2.43 in ♂, 2.27–2.63 in ♀), WW = 0.99 mm (0.95–1.02 in ♂, 0.95–1.05 in ♀), arb = 6/4 (6–8/4–5), avd = 0.88 (0.74–0.89), adf = 1.05 (1.00–1.74), flw = 1.81 (1.56–2.15), FW/HW = 0.47 (0.34–0.43), ch/o = 0.27 (0.22–0.30), prorb = 0.93 (0.77–1.53), rcorb = 0.60 (0.62–0.91), vb = 0.52 (0.46–0.83), dcl = 0.87 (0.59–0.87), presctl = 0.52 (0.60–0.84), sctl = damaged (1.41–1.94), sterno = 0.52 (0.63–1.08), orbito = 1.80 (1.59–1.96), dcp = 0.30 (0.24–0.35), sctlp = 1.67 (1.27–2.19), C = 1.76 (1.65–2.11), 4c = 1.26 (0.96–1.30), 4v = 1.86 (1.44–1.84), 5x = 1.59 (1.26–1.76), ac = 10.67 (8.17–11.00), M = 0.67 (0.55–0.72), C3F = 0.68 (0.57–0.66).

Type materials. Holotype ♂ ( SCAU, No. 125697, DNA #2637), CHINA: Guanlei, Mengla , Yunnan, 21°38'39''N, 101°09'52''E, alt. 560m, 24.iv.2016, ex tree trunk, J. Huang . Paratypes: 4♀ ( SCAU, Nos. 125698–701, DNA #2637), other data same as holotype; 8♂ ( SCAU, Nos. 125702–09, DNA #2638), Wangtianshu, Mengla , Yunnan, 21°36'09''N, 101°35'06''E, alt. 560m, 17.xii.2017, ex tree trunks, H.W. Chen, L. Gong.

Distribution. China (Yunnan).

Etymology. From the word " lancang " in Dai language from the Dai nationality living in Yunnan, China, referring to the Lancang River.

Figures

FIGURE 10. Head, thorax, and abdomen in dorsal and lateral views: A, B. Stegana (Steganina) kanda sp. nov.; C, D. S. (S.) labao Cui & Chen, sp. nov.; E, F. S. (S.) lancang Li & Chen, sp. nov.; G, H. S. (S.) latifoliacea Wang & Chen, sp. nov.; I, J. S. (S.) liusanjieae Li & Chen, sp. nov.

FIGURE 46. Stegana (Steganina) lancang Li & Chen, sp. nov., male (A–G) and female terminalia (H–J). A. Epandrium, surstylus, and cercus in lateral view; B. Surstylus in ventral view; C, D. Hypandrium, pregonite, aedeagus, and phallapodeme in ventral and lateral views; E, F.Aedeagal sheath in ventral and lateral views; G. Subepandrial sclerite in ventral view; H. Epiproct and cercus in dorsal view; I. Eighth sternite in ventral view; J. Hypoproct in ventral view.