Stegana (Steganina) marenubila Cui & 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 : 47-48

Stegana (Steganina) marenubila Cui & Chen , sp. nov.

( Figs. 5A, 5B , 21 )

Diagnosis. This species resembles S. (S.) crinata Zhang & Chen, 2015 in the shape of epandrium, surstylus, and cercus (as fig. 2 in Zhang & Chen 2015, Fig. 21A ), but can be distinguished from the latter by having the aedeagus with 3 pair of basally fused processes: ventral pair small, medial pair slender, and dorsal pair strong ( Fig. 21B, C ).

Description. Male and female: Frons yellow in male, brown in female. First flagellomere yellow in male, brown in female. Face black, with 1 yellow band medially; facial carina absent. Clypeus black. Palpus mostly yellow. Mesonotum and scutellum yellow in male ( Fig. 5A, B ), brownish in female. Katepisternum yellowish ( Fig.

5B). Halter mostly grey ( Fig. 5B ). Fore femur with 3 thin, long setae on distal part of posteroventral surface. Abdominal tergites yellow ( Fig. 5A, B ), 4th to 6th tergites brownish medially in female; sternites yellow, about 2 times as wide as long. Male terminalia ( Fig. 21 ): Epandrium with ca. 8 setae on dorsal to posterior portions per side ( Fig. 21A ). Surstylus lacking pubescence ( Fig. 21A ). Cercus with much pubescence ( Fig. 21A ). Hypandrium slightly expanded anteromedially ( Fig. 21B, C ). Pregonite blurry or absent ( Fig. 21B, C ). Junction between hypandrium and aedeagus with 3 sensilla per side ( Fig. 21B, C ).

Measurements and indices. BL = 2.45 mm in holotype (2.73 in 1♀ paratype), ThL = 1.21 mm (1.19), WL = 2.56 mm (2.75), WW = 0.93 mm (1.12), arb = 7/4 (7/5), avd = 0.73 (0.67), adf = 1.07 (1.21), flw = 1.42 (1.69), FW/ HW = 0.32 (0.37), ch/o = 0.24 (0.24), prorb = 0.96 (0.90), rcorb = 1.20 (0.54), vb = 0.57 (0.46), dcl = 0.28 (1.22), presctl = 0.38 (0.38), sctl = damaged (2.63), sterno = 0.41 (0.46), orbito = 2.22 (1.89), dcp = 0.53 (0.30), sctlp = 1.50 (1.39), C = 2.20 (2.16), 4c = 1.62 (1.02), 4v = 2.49 (1.75), 5x = 1.29 (1.42), ac = 10.75 (8.46), M = 0.93 (0.56), C3F = 0.64 (0.60).

Type materials. Holotype ♂ ( SCAU, No. 125411, DNA #2347), CHINA: Manghai, Mangshi , Yunnan, 24°07'03''N, 98°19'04''E, alt. 1720m, 8.xi.2017, ex tree trunk, H.W. Chen . Paratype: 1♀ ( SCAU, No. 125412, DNA #2747), other data same as holotype.

Distribution. China (Yunnan).

Etymology. A combination of the Latin words " mare " (= sea) and " nubilus " (= nubilous), referring to the meaning of the type locality (Manghai: a sea of clouds).

Figures

FIGURE 5. Head, thorax, and abdomen in dorsal and lateral views: A, B. Stegana (Steganina) marenubila Cui & Chen, sp. nov.; C, D. S. (S.) S. (S.) nigripalpula Cui & Chen, sp. nov.; E, F. S. (S.) glabra Chen & Chen, 2012; G, H. S. (S.) masanoritodai Okada & Sidorenko, 1992; I, J. S. (S.) multidentata Chen, Gao, & Chen, 2009.

FIGURE 21. Stegana (Steganina) marenubila Cui & Chen, sp. nov., male terminalia. A. Epandrium, surstylus, and cercus in lateral view; B, C. Hypandrium, aedeagus, phallapodeme, and aedeagal sheath in ventral and lateral views; D. Subepandrial sclerite in ventral view.