Stegana (Steganina) dendrophila Zhang & 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 : 66-67

Stegana (Steganina) dendrophila Zhang & Chen , sp. nov.

( Figs. 8A, 8B , 36 )

Diagnosis. This species resembles S. (S.) cyclophylla Chen & Chen, 2009 in the shape of hypandrium, pregonite, and aedeagus (as figs. 10, 11 in Chen & Chen 2009, Fig. 36B, C ), but can be distinguished from the latter by having the surstylus lacking peg-like tooth (Fig. 36A); the aedeagus with numerous minute, serrated processes distally, lacking pubescence (Fig. 36B, C); the subepandrial sclerite slightly squared, concaved anteromedially (Fig. 36D).

Description. Male: First flagellomere yellow on basal 1/3, black on distal 2/3. Clypeus brown medially, yellow laterally. Mesonotum and scutellum black ( Fig. 8A ). Katepisternum yellowish, brown on anterior corner ( Fig. 8B ). Halter mostly brownish ( Fig. 8B ). Fore femur with a row of 3 long setae on distal part of posteroventral surface. Abdominal tergites dark brown ( Fig. 8A, B ); sternites brown, slightly wider than long. Male terminalia ( Fig. 36 ): Epandrium with ca. 20 setae on dorsal to posterior portions per side ( Fig. 36A ). Surstylus with several setulae and some pubescence distally ( Fig. 36A ). Cercus with much pubescence ( Fig. 36A ). Hypandrium expanded anteromedially ( Fig. 36B, C ). Pregonite fused with hypandrium and small, with 4 sensilla ( Fig. 36B, C ). Aedeagal sheath with some numerous minute, serrated processes distally ( Fig. 36B, C ).

Measurements and indices. BL = 3.20 mm in holotype, ThL = 1.30 mm, WL = 1.93 mm, WW = 1.07 mm, arb = 9/6, avd = 0.83, adf = 1.71, flw = 1.29, FW/HW = 0.46, ch/o = 0.14, prorb = 1.45, rcorb = 1.00, vb = 0.33, dcl = 0.66, presctl = 0.70, sctl = 2.77, sterno = 1.00, orbito = 2.50, dcp = 0.19, sctlp = 2.50, C = 1.84, 4c = 1.23, 4v = 1.80, 5x = 1.33, ac = 9.25, M = 0.53, C3F = 0.62.

Type material. Holotype ♂ ( SCAU, No. 125633, DNA #1338, 2770), CHINA: Menglun, Mengla , Yunnan, 21°47'29''N, 101°22'59''E, alt. 680m, 28.ix.2011, ex tree trunk, H.W. Chen.

Distribution. China (Yunnan).

Etymology. From the Greek word '' dendrophilus '' (= dendrophilous), referring to the arboreal Steganina flies.

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