Stegana (Steganina) rava 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 : 93-94

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

( Figs. 13A, 13B , 58 )

Diagnosis. This species is similar to S. (S.) flavipes sp. nov. in the shape of male terminalia ( Figs. 38 , 58 ), but can be distinguished from the latter by having the surstylus laterally with some minute, serrated processes ( Fig. 58A, B ); the aedeagus with some pubescence distoventrally ( Fig. 58C, D ); the subepandrial sclerite vaulted ( Fig. 58G ).

Description. Male: First flagellomere brown. Clypeus yellow. Mesonotum yellow ( Fig. 13A ). Katepisternum yellowish ( Fig. 13B ). Scutellum yellow, brownish near distal margin ( Fig. 13A ). Halter mostly brownish ( Fig. 13B ). Fore femur with 4 thin, long setae on distal part of posteroventral surface. Abdominal tergites brownish ( Fig. 13A, B ); sternites yellow, about 1.6 times as wide as long. Male terminalia ( Fig. 58 ): Epandrium with ca. 8 setae on dorsal to posterior portions per side ( Fig. 58A ). Surstylus slightly oval, with some setulae along distal margin and inner surface, lacking pubescence ( Fig. 58A, B ). Cercus with sparse pubescence ( Fig. 58A ). Hypandrium expanded anteromedially ( Fig. 58C, D ). Pregonite small, with 2 sensilla ( Fig. 58C, D ). Aedeagus tubular, distally slightly expanded, distoventrally with 3 rugae per side, lacking serrated process ( Fig. 58C, D ). Aedeagal sheath small, lacking serrated process ( Fig. 58E, F ).

Measurements and indices. BL = 2.67 mm in holotype, ThL = 1.15 mm, WL = 2.32 mm, WW = 1.01 mm, arb = 6/5, avd = 0.76, adf = 0.93, flw = 1.76, FW/HW = 0.37, ch/o = 0.28, prorb = 0.87, rcorb = 0.68, vb = 0.60, dcl = 0.61, presctl = 0.80, sctl = 2.10, sterno = 0.76, orbito = 1.67, dcp = 0.21, sctlp = 1.51, C = 1.66, 4c = 1.07, 4v = 1.63, 5x = 1.23, ac = 9.27, M = 0.52, C3F = 0.62.

Type material. Holotype ♂ ( SCAU, No. 125656, DNA #2705), Menglun, Mengla , Yunnan , 21°47'29''N, 101°22'59''E, alt. 560m, 16,17. iv.2007, ex tree trunk, H.W. Chen.

Distribution. China (Yunnan).

Etymology. From the word " rava " in Dai language from the Dai nationality living in Yunnan, China, referring to the meaning "a happy place".

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 38. Stegana (Steganina) flavipes 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.

FIGURE 58. Stegana (Steganina) rava Cui & 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.