Stegana (Steganina) cucullata 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 : 62-64

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

( Figs. 7C, 7D , 33 )

Diagnosis. This species closely resembles S. (S.) eurystoma Wang, Gao, & Chen, 2013 in the shape of male terminalia (as fig. 3 in Wang et al. 2013, Fig. 33 ), but can be distinguished from the latter by having the pregonite blurry or absent ( Fig. 33C, D, J, K ); the aedeagus lacking serrated process near distal margin ( Fig. 33C, D, J, K ); the aedeagal sheath distally slightly strong and dorsad curved ( Fig. 33E, F, L, M ).

Remarks. The type specimens collected from Guangxi and Sichuan slightly differ from those from Chongqing in the surstylus lacking serrated process, with 1 peg-like tooth near distal margin ( Fig. 33B, I ), the cercus lacking pubescence ( Fig. 33A, H ), and the aedeagus with several minute, serrated processes distally and pubescence distoventrally ( Fig. 33C, D, J, K ). They were conservatively identified as conspecific.

Description. Male and female: First flagellomere brown. Clypeus yellow. Mesonotum dark brown, with brownish yellow longitudinal stripes submedially and laterally ( Fig. 7C ). Katepisternum yellowish ( Fig. 7D ). Scutellum dark brown ( Fig. 7C ). Halter mostly grey ( Fig. 7D ). Fore femur with a row of 4 or 5 sturdy setae on distal part of posteroventral surface. Abdominal tergites dark brown ( Fig. 7C, D ); sternites yellow, about 2 times as wide as long. Male terminalia ( Fig. 33 ): Epandrium with ca. 14 setae on dorsal to posterior portions per side ( Fig. 33A, H ). Surstylus with numerous setulae near distal margin ( Fig. 33A, B, H, I ). Hypandrium roundly expanded anteromedially ( Fig. 33C, D, J, K ). Pregonite with 1 or 2 sensilla ( Fig. 33C, J, K ). Aedeagus spoon-shaped, distally broadened ( Fig. 33C, D, J, K ). Subepandrial sclerite slightly vaulted, broadened distally ( Fig. 33G, N ).

Measurement and indices. BL = 3.64 mm in holotype (2.35–3.15 in 5♂, 2.40–4.00 in 5♀ paratypes), ThL = 1.75 FW/HW = 0.37 (0.30–0.48), ch/o = 0.27 (0.18–0.36), prorb = 0.71 (0.76–1.38), rcorb = 0.53 (0.60–0.90), vb = 0.38 (0.50–0.78), dcl = damaged (0.36–0.75), presctl = 0.52 (0.31–0.78), sctl = 1.52 (1.56–2.13), sterno = 0.56 (0.55–1.17), orbito = 2.50 (1.20–2.40), dcp = 0.43 (0.15–0.34), sctlp = 1.64 (1.54–2.00), C = 1.71 (1.68–2.05), 4c = 1.24 (0.95–2.40), 4v = 1.88 (1.48–2.33), 5x = 1.57 (0.72–1.91), ac = 10.50 (7.33–12.67), M = 0.65 (0.53–0.82), C3F = 0.53 (0.54–0.72).

Type materials. Holotype ♂ ( SCAU, No. 121109, DNA #546), CHINA: Fengtongzhai, Baoxing , Sichuan, 30°32'42''N, 102°54'24''E, alt. 1700m, 19.ix.2005, ex tree trunk, H.W. Chen . Paratypes: 1♀ ( SCAU, No. 121110), other data same as holotype ; 5♂, 3♀ ( SCAU, Nos. 125595–603, DNA #2609), 18.vii.2017, L. Gong, Y. Lin, Y.L. Wang, other data same as holotype ; 1♂ ( SCAU, No. 125604, DNA #983), Maoershan, Xing'an , Guangxi, 25°51'28''N, 110°25'01''E, alt. 700m, 24.ix.2006, ex tree trunk, J.J. Jiang ; 1♂ ( SCAU, No. 125605, DNA #1782), Simianshan, Jiangjing , Chongqing, 28°37'19''N, 106°23'50''E, alt. 1108m, 7.vii.2014, ex tree trunk, Y.Q. Liu.

Distribution. China (Guangxi, Chongqing, Sichuan).

Etymology. From the Latin word " cucullatus " (= cucullate), referring to the spoon-shaped aedeagus.

Figures

FIGURE 7. Head, thorax, and abdomen in dorsal and lateral views: A, B. Stegana (Steganina) cornuta Li & Chen, sp. nov.; C, D. S. (S.) cucullata Li & Chen, sp. nov.; E, F. S. (S.) cultella Cui & Chen, sp. nov.; G, H. S. (S.) curvitabulata Cui & Chen, sp. nov.; I, J. S. (S.) daiya Cui & Chen, sp. nov.

FIGURE 33. Stegana (Steganina) cucullata Li & Chen, sp. nov. from Baoxing, Sichuan, China (A–G) and Jiangjin, Chongqing, China (H–N), male terminalia. A, H. Epandrium, surstylus, and cercus in lateral view; B, I. Surstylus in ventral view; C, D, J, K. Hypandrium, pregonite, aedeagus, and phallapodeme in ventral and lateral views; E, F, L M. Aedeagal sheath in ventral