Stegana (Steganina) sciophila 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 : 94-95

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

( Figs. 13C, 13D , 59 )

Diagnosis. This species is similar to S. (S.) hirticeps Wang, Gao, & Chen, 2013 in the shape of male terminalia (as fig. 5 in Wang et al. 2013, Fig. 59 ), but can be distinguished from the latter by having the surstylus with 1 peg-like tooth near distal margin ( Fig. 59A, B ); the subepandrial sclerite vaulted, bifurcated basally per side, roundly expanded distally ( Fig. 59G ).

Description. Male and female: First flagellomere brown. Clypeus yellow. Mesonotum dark brown medially, brownish laterally ( Fig. 13C ). Katepisternum yellowish ( Fig. 13D ). Scutellum mostly yellow, brown anteromedially ( Fig. 13C ). Halter mostly brownish ( Fig. 13D ). Fore femur with a row of 4 long setae on distal part of posteroventral surface. Abdominal tergites dark brown to black ( Fig. 13C, D ); sternites brown in male, yellow in female, about 2.2 times as wide as long. Male terminalia ( Fig. 59 ): Epandrium with ca. 8 setae on dorsal to posterior portions per side ( Fig. 59A ). Surstylus with some minute, serrated processes on outer surface and setulae near distal margin, lacking pubescence ( Fig. 59A ). Cercus lacking pubescence ( Fig. 59A ). Hypandrium roundly expanded anteromedially ( Fig. 59C, D ). Pregonite small, with 2 sensilla ( Fig. 59C, D ). Aedeagus with much pubescence distomedially ( Fig. 59C, D ). Aedeagal sheath distally dorsad curved and with several minute, serrated processes ( Fig. 59E, F ).

Measurements and indices. BL = 3.07 mm in holotype (2.54–2.88 in 4♂, 3.13–3.21 in 3♀ paratypes), ThL = 1.48 mm (1.21–1.36 in ♂, 1.36–1.49 in ♀), WL = 2.97 mm (2.33–2.78 in ♂, 2.64–2.91 in ♀), WW = 1.23 mm (0.92–1.04 in ♂, 1.01–1.31 in ♀), arb = 7/5 (5–7/4–5), avd = 0.76 (0.73–0.91), adf = 1.44 (0.96–1.30), flw = 2.05 (1.53–2.21), FW/HW = 0.34 (0.33–0.39), ch/o = 0.19 (0.26–0.34), prorb = 1.09 (1.07–1.46), rcorb = 0.78 (0.69– 1.04), vb = 0.87 (0.60–0.82), dcl = 0.43 (0.49–0.82), presctl = 0.49 (0.55–0.83), sctl = 2.33 (1.66–3.04), sterno = 0.81 (0.69–1.45), orbito = 1.43 (1.56–2.00), dcp = 0.31 (0.31–0.37), sctlp = 1.73 (1.14–1.92), C = 1.82 (1.60–1.95), 4c = 1.19 (1.02–1.22), 4v = 1.84 (1.51–1.69), 5x = 1.94 (1.33–1.69), ac = 9.33 (9.91–14.00), M = 0.66 (0.51–0.60), C3F = 0.62 (0.55–0.64).

Type materials. Holotype ♂ ( SCAU, No. 125717, DNA #2667), CHINA: Jinshan, Menglian , Yunnan, 22°19'29''N, 99°35'00''E, alt. 940m, 25.x.2017, ex tree trunk, H.W. Chen . Paratypes: 3♂, 1♀ ( SCAU, Nos. 125718– 21), L. Gong, B.X. Li, other data same as holotype ; 1♂, 2♀ ( SCAU, Nos. 125722–24, DNA #2668), Muyiji Park, Ximeng , Yunnan, 22°37'23''N, 99°36'11''E, alt. 1100m, 16.iv.2018, ex tree trunks, H.W. Chen, L. Gong.

Distribution. China (Yunnan).

Etymology. From the Greek word " sciophilous " (= sciophilous), referring to the sciophilous Steganina flies.

Figures

FIGURE 13. Head, thorax, and abdomen in dorsal and lateral views: A, B. Stegana (Steganina) rava Cui & Chen, sp. nov.; C, D. S. (S.) sciophila Li & Chen, sp. nov.; E, F. S. (S.) septencolorata Li & Chen, sp. nov.; G, H. S. (S.) silvestrella Zhang & Chen, sp. nov.; I, J. S. (S.) simola Cui & Chen, sp. nov.

FIGURE 59. Stegana (Steganina) sciophila 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.