Stegana (Steganina) nayun 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 : 88-90

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

( Figs. 12C, 12D , 54 )

Diagnosis. This species is similar to S. (S.) cylindrica Wang, Gao, & Chen, 2013 in the shape of male terminalia (as fig. 2 in Wang et al. 2013, Fig. 54 ), but can be distinguished from the latter by having the tubular aedeagus distoventrally with 3 rugae per side, lacking pubescence ( Fig. 54C, D ); the subepandrial sclerite lacking pubescence ( Fig. 54G ).

Description. Male and female: First flagellomere brownish. Clypeus yellow. Mesonotum brown medially, brownish yellow laterally ( Fig. 12C ). Katepisternum yellow ( Fig. 12D ). Scutellum brown medially, dark brown laterally, yellow at tip ( Fig. 12C ). Halter mostly grey ( Fig. 12D ). Fore femur with a row of 4 long setae on distal part of posteroventral surface. Abdominal tergites brown to dark brown; sternites brown, about 2 times as wide as long. Male terminalia ( Fig. 54A–G ): Epandrium with ca. 11 setae on dorsal to posterior portions per side ( Fig. 54A ). Surstylus with 1 peg-like tooth and some setulae near distal margin, lacking pubescence ( Fig. 54A, B ). Cercus lacking pubescence ( Fig. 54A ). Hypandrium strongly expanded anteromedially ( Fig. 54C, D ). Pregonite small, with 2 sensilla ( Fig. 54C, D ). Aedeagus lacking serrated process ( Fig. 54C, D ). Aedeagal sheath distally dorsad curved and with several minute, serrated processes ( Fig. 54E, F ). Subepandrial sclerite slightly rectangle distally ( Fig. 54G ). Female terminalia ( Fig. 54H–J ): Epiproct with several setae on distal 1/2 ( Fig. 54H ). Cercus and hypoproct with numerous setae and much pubescence ( Fig. 54H, J ). Eight sternite about 1.5 times as long as wide, glabrous on basal 4/5, with several setae and some pubescence on distal 1/5 ( Fig. 54I ).

HW = 0.38 (0.42), ch/o = 0.29 (0.38), prorb = 1.05 (1.50), rcorb = 0.79 (0.88), vb = 0.64 (0.93), dcl = 0.43 (0.35), presctl = 0.70 (0.70), sctl = 3.15 (2.39), sterno = 1.19 (0.93), orbito = 1.89 (1.89), dcp = 0.21 (0.21), sctlp = 1.78 (2.22), C = 1.98 (1.95), 4c = 1.05 (1.39), 4v = 1.20 (2.21), 5x = 1.54 (1.91), ac = 10.25 (13.00), M = 0.55 (0.76), C3F = 0.61 (0.70).

Type materials. Holotype ♂ ( SCAU, No. 125730, DNA #2674), CHINA: Jinshan, Menglian , Yunnan, 22°19'29''N, 99°35'00''E, alt. 940m, 25.x.2017, ex tree trunk, H.W. Chen . Paratypes: 1♀ ( SCAU, No. 125731, DNA #2693), other data same as holotype ; 1♀ ( SCAU, No. 125787, DNA #2608), Fengtongzhai, Baoxing , Sichuan, 30°32'42''N, 102°54'24''E, alt. 1500m, 18.vii.2017, ex tree trunk, Y.L. Wang.

Distribution. China (Sichuan, Yunnan).

Etymology. From the name of the type locality "Jinshan" belonging to "Nayun, Menglian, Yunnan ".

Figures

FIGURE 12. Head, thorax, and abdomen in dorsal and lateral views: A, B. Stegana (Steganina) multiprocera Li & Chen, sp. nov.; C, D. S. (S.) nayun Li & Chen, sp. nov.; E, F. S. (S.) nigridentata Li & Chen, sp. nov.; G, H. S. (S.) otphylla Cui & Chen, sp. nov.; I, J. S. (S.) radiciflava Zhang & Chen, sp. nov.

FIGURE 54. Stegana (Steganina) nayun 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.