Stegana (Steganina) cylindrica, Wang & Gao & Chen, 2013

Wang, Le, Gao, Jian-Jun & Chen, Hong-Wei, 2013, Ten new species of the subgenus Steganina (Diptera: Drosophilidae: Stegana) from southern China, Journal of Natural History (J. Nat. Hist.) 47 (29 - 30), pp. 1993-2013 : 1997-1999

Stegana (Steganina) cylindrica sp. nov.

( Figure 2 )

Diagnosis

This species is similar to S. cyclophylla Chen and Chen, 2009a from south-western China in the surstylus lacking serrated, minute processes on outer surface and the hypandrium slightly square anteromedially, can be differentiated from it by having the cercus lacking pubescence ( Figure 2A ), the dorsal projection of gonopods slightly triangularly expanded in ventral view, not curved dorsad ( Figure 2F ). In S. cyclophylla : the cercus with dense pubescence dorsally (as in Chen and Chen 2009a, fig. 8); the dorsal projection of gonopods slender and strongly curved dorsad (as in Chen and Chen 2009a, fig. 13).

Description

Frons slightly dark brown, lacking minute setulae. Fronto-orbital plate yellow above, brown below. Pedicel dark brown, yellow medially; first flagellomere dark brown. Face black on upper two-thirds, yellow on lower margin. Clypeus brown medially, yellow laterally. Scutum brown medially, yellow laterally. Basisternum yellow. Scutellum brown to black. Wing brown anteriorly, brownish posteriorly, slightly dark on all crossveins. Fore femur with one row of three or four long, suberect setae on ventral surface. Abdominal tergites brown to dark brown medially, narrowly yellow laterally. Sternites mostly yellow, brown on fifth, slightly wider than length. Male terminalia: Surstylus with one prensiseta apically ( Figure 2B ). Tenth sternite broadened, with pubescence basolaterally ( Figure 2C ). Paramere distinctly protruded, with ca. two sensilla ( Figure 2D, E ). Dorsal projection of gonopods with serrated, minute processes ( Figure 2F ). Aedeagus nearly cylindric in ventral view, with pubescence medially on opening ( Figure 2D ).

Measurements

BL = 2.64 mm in holotype (range one ♂ and one ♀ paratypes: 3.20 in ♂, 2.90 in ♀), ThL = 1.28 mm (1.52 in ♂, 1.31 in ♀), WL = 1.70 mm (1.96 in ♂, 1.90 in ♀), WW = 0.86 mm (1.16 in ♂, 0.97 in ♀), arb = 14 / 8 (15 / 6–8), avd = 0.75 (0.67–0.80), adf = 1.60 (0.86–1.67), flw = 2.40 (1.86–2.50), FW / HW = 0.40 (0.44–0.50), ch / o = 0.22 (0.20–0.25), prorb = 1.20 (1.08–1.33), rcorb = 0.90 (0.45–0.54), vb = 0.29 (0.27–0.37), dcl = 0.39 (0.39–0.41), presctl = 0.50 (0.50–0.65), sctl = 1.53 (2.08–2.17), sterno = 0.52 (0.56–0.57), orbito = 1.60 (1.29–2.00), dcp = 0.19 (0.19–0.22), sctlp = 1.50 (2.13–2.38), C = 1.80 (1.77–1.94), 4c = 1.14 (0.97–1.41), 4v = 1.68 (1.22–2.41), 5x = 1.07 (1.60), ac = 12.50 (15.50–17.50), M = 0.68 (0.45–0.73), C3F = 0.65 (0.69–0.78).

Type material

Holotype ♂ ( SCAU, No. 121129) and paratypes one ♂, one ♀ ( SCAU, Nos 121130, 31), CHINA: Mount Diaoluo, Lingshui , Hainan, 18 ◦ 10 ′ N, 108 ◦ 52 ′ E, altitude 1000 m, 3 December 2003, HW Chen.

Etymology

From the Greek words: cylindros, referring to the aedeagus being nearly cylindric in lateral view.

Distribution

China (Hainan).

Figures

Figure 2. Stegana (Steganina) cylindrica sp. nov., male terminalia: (A) epandrium, cercus and surstylus; (B) surstylus; (C) 10th sternite; (D, E) hypandrium, paramere(s), aedeagus and aedeagal apodeme; (F) gonopods. Scale bars: 0.1 mm.