Stegana (Steganina) fusca 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 : 71

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

( Figs. 8I, 8J , 40 )

Diagnosis. This species differs from the other Steganina species in having the small body size (BL ranged from 2.33–2.85 mm in measured specimens) and the relatively light body color ( Fig. 8I, J ); the aedeagal opening nearly triangular in ventral view, with thick pubescence ( Fig. 40B ).

Description. Male and female: First flagellomere brown. Clypeus yellow. Mesonotum brownish yellow in male, brown medially, brownish laterally in female ( Fig. 8I ). Katepisternum yellowish ( Fig. 8J ). Scutellum brownish medially, brown laterally ( Fig. 8I ). Halter mostly brownish ( Fig. 8J ). Fore femur with a row of 3 strong setae on distal part of posteroventral surface. Abdominal tergites yellow to brownish in male ( Fig. 8I, J ), brown in female; sternites brown, slightly wider than long. Male terminalia ( Fig. 40 ): Epandrium with ca. 10 setae on dorsal to posterior portions per side ( Fig. 40A ). Surstylus with 1 peg-like tooth and several setulae near distal margin, lacking pubescence ( Fig. 40A ). Cercus lacking pubescence ( Fig. 40A ). Hypandrium roundly expanded anteromedially ( Fig. 40B, C ). Pregonite with 5 sensilla ( Fig. 40B, C ). Aedeagal sheath distally dorsad curved and with several minute, serrated processes ( Fig. 40D, E ). Subepandrial sclerite slightly vaulted ( Fig. 40F ).

Measurements and indices. BL = 2.75 mm in holotype (2.33–2.73 in 2♂, 2.37–2.85 in 3♀ paratypes), ThL = 1.29 mm (1.15–1.34 in ♂, 1.21–1.34 in ♀), WL = 2.21 mm (2.25–2.68 in ♂, 2.41–2.65 in ♀), WW = 1.14 mm (1.01–1.24 in ♂, 0.95–1.16 in ♀), arb = 7/3 (6–8/4–5), avd = 0.63 (0.74–0.89), adf = 1.24 (1.03–1.50), flw = 1.85 (2.36–3.13), FW/HW = 0.41 (0.37–0.43), ch/o = 0.26 (0.16–0.39), prorb = 1.35 (0.83–1.06), rcorb = 1.10 (0.57– 0.72), vb = 0.89 (0.61–0.75), dcl = 0.66 (0.54–0.75), presctl = 0.64 (0.52–0.78), sctl = 1.90 (1.87–2.52), sterno = 0.89 (0.67–1.14), orbito = 1.62 (1.63–2.05), dcp = 0.30 (0.29–0.36), sctlp = 1.39 (1.33–1.93), C = 1.65 (1.49–1.82), 4c = 1.04 (1.24–1.56), 4v = 1.44 (1.68–2.14), 5x = 1.53 (1.45–1.85), ac = 11.33 (9.91–13.00), M = 0.50 (0.59–0.74), C3F = 0.69 (0.56–0.70).

Type materials. Holotype ♂ ( SCAU, No. 125686, DNA #2172), CHINA: Mengdong, Cangyuan , Yunnan, 23°10'08''N, 99°13'52''E, alt. 1320m, 10.v.2016, ex tree trunk, Y.L. Wang . Paratypes: 2♂, 3♀ ( SCAU, Nos. 125687– 91, DNA #2729), Muyiji Park, Ximeng , Yunnan, 22°37'13''N, 99°35'45''E, alt. 1100m, 30.iv.2016, ex tree trunks, J. Huang, Y.Q. Liu, Y.L. Wang, L. Zhu.

Distribution. China (Yunnan).

Etymology. From the Latin word " fuscus " (= brown), referring to the brown body color.

Figures

FIGURE 8. A, B. Stegana (Steganina) dendrophila Zhang & Chen, sp. nov.; C, D. S. (S.) flabella Li & Chen, sp. nov.; E, F. S. (S.) flavipes Li & Chen, sp. nov.; G, H. S. (S.) formosa Zhang & Chen, sp. nov.; I, J. S. (S.) fusca Li & Chen, sp. nov.

FIGURE 40. Stegana (Steganina) fusca Li & Chen, sp. nov., male terminalia. A. Epandrium, surstylus, and cercus in lateral view; B, C. Hypandrium, pregonite, aedeagus, and phallapodeme in ventral and lateral views; D, E. Aedeagal sheath in ventral and lateral views; F. Subepandrial sclerite in ventral view.