Stegana (Steganina) yani 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 : 99-100

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

( Figs. 14A, 14B , 63 )

Diagnosis. This species is similar to S. (S.) cornuta sp. nov. in the shape of epandrium, surstylus, cercus ( Figs. 32A, 32B , 63A ), aedeagus ( Figs. 32C, 32D , 63B, 63C ), and subepandrial sclerite ( Figs.32E, 32F , 63D, 63E ), but can be distinguished from the latter by having the cercus with sparse pubescence ( Fig. 63A ); the pregonite blurry or absent ( Fig. 63B, C ); the subepandrial sclerite nearly triangular ( Fig. 63F ).

Description. Male and female: First flagellomere brown. Clypeus brown. Mesonotum brownish ( Fig. 14A ). Katepisternum yellowish ( Fig. 14B ). Scutellum brown ( Fig. 14A ). Halter mostly grey ( Fig. 14B ). Fore femur with a row of 3 long setae on distal part of posteroventral surface. Abdominal tergites dark brown ( Fig. 14A, B ); sternites dark brown, about 1.2 times as wide as long. Male terminalia ( Fig. 63 ): Epandrium with ca. 12 setae on dorsal to posterior portions per side ( Fig. 63A ). Surstylus with 1 peg-like tooth and some setulae near distal margin, lacking serrated process and pubescence ( Fig. 63A ). Hypandrium roundly expanded anteromedially ( Fig. 63B, C ). Aedeagus with numerous minute, serrated processes distodorsally and much pubescence distoventrally ( Fig. 63B, C ). Aedeagal sheath distally slender, strongly dorsad curved, and with some minute, serrated processes ( Fig. 63D, E ).

Measurements and indices. BL = 2.39 mm in holotype (2.25–2.57 in 5♂, 2.47–3.05 in 5♀ paratypes), ThL = 1.07 mm (1.14–1.29 in ♂, 0.99–1.46 in ♀), WL = 2.21 mm (2.12–2.43 in ♂, 2.14–2.66 in ♀), WW = 0.92 mm (0.93–1.04 in ♂, 0.94–1.07 in ♀), arb = 6/4 (6–8/4–5), avd = 0.81 (0.75–0.89), adf = 1.17 (0.80–1.32), flw = 2.00 (1.41–2.22), FW/HW = 0.43 (0.37–0.43), ch/o = 0.34 (0.24–0.42), prorb = 1.17 (0.72–1.36), rcorb = 0.60 (0.69– 0.87), vb = 0.74 (0.68–1.13), dcl = 0.53 (0.65–0.94), presctl = 0.76 (0.46–0.84), sctl = 2.52 (1.25–2.69), sterno = 0.73 (0.64–1.07), orbito = 1.63 (1.61–2.41), dcp = 0.35 (0.31–0.36), sctlp = 1.95 (1.65–2.17), C = 1.87 (1.57–1.84), 4c = 1.23 (0.91–1.36), 4v = 2.06 (1.47–2.19), 5x = 1.13 (1.31–1.82), ac = 9.88 (8.55–11.22), M = 0.56 (0.55–0.76), C3F = 0.62 (0.53–0.70).

Type materials. Holotype ♂ ( SCAU, No.125732, DNA #2179), CHINA: Qimaba, Lüchun , Yunnan, 22°49'08''N, 102°17'25''E, alt. 600m, 30.x.2016, ex tussock, H.W. Chen . Paratypes: 1♀ ( SCAU, No. 125734, DNA #2182), Er'pu, Lüchun , Yunnan, 22°37'06''N, 102°21'06''E, alt. 600m, 28.x.2016, ex tree trunk, H.W. Chen; 2♂, 3♀ ( SCAU, Nos. 125735–39, DNA #2728), Longtan Park, Ximeng , Yunnan, 22°38'55''N, 99°36'02''E, alt. 1150m, 17.iv.2018, ex tree trunks, H.W. Chen, L. Gong, Y. Lin; 1♀ ( SCAU, No. 125733, DNA #2188), Botanic Garden, Ruili , Yunnan, 24°04'19''N, 97°49'08''E, alt. 1150m, 22.iv.2018, ex tree trunk, H.W. Chen; 4♂ ( SCAU, Nos. 125740–43, DNA #2643, 2744), Menglun, Mengla, Yunnan, 21°47'29''N, 101°22'59''E, alt. 560m, 16,17. iv.2007, ex tree trunks, H.W. Chen, J.J. Gao, F. Zhao.

Distribution. China (Yunnan).

Etymology. From the word " yani " in Hani language from the Hani nationality living in Yunnan, China, referring to the meaning "dreamlike hometown".

Figures

FIGURE 14. Head, thorax, and abdomen in dorsal and lateral views: A, B. S. (S.) yani Li & Chen, sp. nov.; C, D. S. (S.) yixiang Zhang & Chen, sp. nov.; E, F. S. (S.) zaduo Cui & Chen, sp. nov.; G, H. S. (S.) zhuoma Cui & Chen, sp. nov.

FIGURE 32. Stegana (Steganina) cornuta Li & Chen, sp. nov., male terminalia. 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.

FIGURE 63. Stegana (Steganina) yani Li & 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.