Stegana (Steganina) nigridentata 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 : 90-91

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

( Figs. 12E, 12F , 55 )

Diagnosis. This species is similar to S. (S.) menghai sp. nov. in the shape of male terminalia ( Figs. 50 , 55 ), but can be distinguished from the latter by having the pregonite blurry or absent ( Fig. 50B, C ); the aedeagus laterally deeply dehiscent and with 4 small black teeth per side, distally lacking serrated process ( Fig. 55B, C ).

Description. Male and female: First flagellomere dark brown. Clypeus dark brown medially, yellow laterally. Mesonotum brown to black medially, brownish yellow to brown laterally ( Fig. 12E ). Katepisternum yellow above, brownish below ( Fig. 12F ). Scutellum dark brown to black ( Fig. 12E ). Halter mostly grey ( Fig. 12F ). Fore femur with a row of 3 or 4 long setae on distal part of posteroventral surface. Abdominal tergites mostly black ( Fig. 12E , margin, lacking pubescence ( Fig. 55A ). Cercus with much pubescence ( Fig. 55A ). Hypandrium expanded anteromedially ( Fig. 55B, C ). Aedeagal sheath distally dorsad curved and with numerous minute, serrated processes ( Fig. 55D, E ). Subepandrial sclerite vaulted ( Fig. 55F ).

Measurements and indices. BL = 3.28 mm in holotype (2.88–3.52 in 5♂, 3.24–4.20 in 5♀ paratypes), ThL = 1.44 mm (1.43–1.80 in ♂, 1.76–2.05 in ♀), WL = 2.44 mm (2.36–3.00 in ♂, 2.72–3.24 in ♀), WW = 1.20 mm (1.10–1.40 in ♂, 1.208–1.60 in ♀), arb = 14/5 (8–14/4–6), avd = 0.60 (0.44–0.91), adf = 1.43 (1.57–2.25), flw = 1.57 (1.50–2.60), FW/HW = 0.38 (0.27–0.38), ch/o = 0.22 (0.13–0.27), prorb = 1.25 (0.75–1.14), rcorb = 0.92 (0.58–1.17), vb = 0.75 (0.29–0.67), dcl = 0.75 (0.27–0.75), presctl = 0.63 (0.50–0.93), sctl = 1.50 (1.24–1.93), sterno = 0.92 (0.59–0.82), orbito = 2.60 (1.67–2.50), dcp = 0.21 (0.18–0.26), sctlp = 1.73 (1.50–2.27), C = 2.62 (1.73–2.25), 4c = 0.81 (1.09–1.26), 4v = 1.63 (1.63–2.19), 5x = 1.60 (1.36–2.00), ac = 13.00 (10.00–21.25), M = 0.50 (0.50–0.81), C3F = 0.57 (0.69–0.82).

Type materials. Holotype ♂ ( SCAU, No. 121132), CHINA: Maoershan, Xing'an , Guangxi, 25°51'28''N, 110°25'01''E, alt. 700m, 23.x.2004, ex tree trunk, H.W. Chen . Paratypes: 6♂, 18♀ ( SCAU, Nos. 121133–56, DNA #1461, 1462), 19.x.2006, other data same as holotype ; 2♀ ( SCAU, Nos. 125606, 07, DNA #2190), Yixiang, Pu'er , Yunnan, 22°44'19''N, 101°07'01''E, alt. 1400m, 13.v.2012, ex tree trunks, J.J. Gao.

Distribution. China (Guangxi, Yunnan).

Etymology. A combination of the Latin words " niger " (= black) and " dentatus " (= dentate), referring to the aedeagus laterally with 4 small black teeth.

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 50. Stegana (Steganina) menghai Zhang & 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.

FIGURE 55. Stegana (Steganina) nigridentata 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.