Stegana (Steganina) hamata, 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 : 2000-2002

Stegana (Steganina) hamata sp. nov.

( Figure 4 )

Diagnosis

This species is similar to S. angulistrata Wu and Chen, 2010 from south-western China in the cercus lacking pubescence and the shape of gonopods, but can be differentiated from it by having the surstylus lacking serrated, minute processes on outer surface ( Figure 4A ), the aedeagus sub-basally with vertical process bearing some serrated processes on lateral margins ( Figure 4C, D ; vp). In S. angulistrata : the surstylus distally with serrated, minute processes on outer surface (as in Wu and Chen 2010, fig. 1); the aedeagus submedially with one irregular row (c.14–16) of serrated processes (as in Wu and Chen 2010, figs 3, 4).

Description

Frons nearly black, lacking minute setulae. Fronto-orbital plate brownish yellow. Pedicel orange-yellow; first flagellomere mostly black. Face black on upper twothirds, yellow on lower margin. Clypeus yellow. Scutum black medially, dark brown laterally. Basisternum slightly brown. Scutellum dark brown. Wing brown anteriorly, paler posteriorly, slightly dark on all crossveins. Fore femur with one row of three or four suberect setae on ventral surface. Abdominal tergites dark brown to black. Sternites brown, broadened, wider than length. Male terminalia: surstylus with one prensiseta near apical margin ( Figure 4A ). Tenth sternite slightly vaulted, expanded subbasolaterally ( Figure 4B ). Hypandrium roundly expanded anteromedially ( Figure 4C ). Paramere protruded and with one sensillum ( Figure 4C, D ). Dorsal projection of gonopods slender and strongly curved dorsad, with serrated, minute processes ( Figure 4D ). Aedeagus broadened distally in ventral view, with serrated, minute processes laterally and pubescence near anterior margin of opening ( Figure 4C, D ).

Measurements

BL = 2.60 mm in holotype (range in five ♂ and five ♀ paratypes: 2.48–2.92 in ♂, 2.63–3.32 in ♀), ThL = 1.32 mm (1.12–1.40 in ♂, 1.34–1.52 in ♀), WL = 2.40 mm (1.90–2.24 in ♂, 2.12–2.40 in ♀), WW = 1.20 mm (0.88–1.08 in ♂, 0.92–1.17 in ♀), arb = 10 / 4 (10–13 / 4–6), avd = 0.83 (0.78–0.88), adf = 1.00 (1.00–1.80), flw = 1.83 (2.00–2.50), FW / HW = 0.40 (0.38–0.55), ch / o = 0.22 (0.13–0.27), prorb = 0.80 (0.67–1.29), rcorb = 0.70 (0.45–1.29), vb = 0.50 (0.36–0.71), dcl = (0.33–0.64), presctl = 0.56 (0.36–0.83), sctl = 2.50 (1.71–2.29), sterno = 074 (0.45–0.90), orbito = 1.60 (1.40–2.00), dcp = 0.24 (0.17–0.40), sctlp = 2.50 (2.07–2.67), C = 2.22 (1.59–2.06), 4c = 0.96 (1.13–1.42), 4v = 1.75 (1.46–2.30), 5x = 1.70 (1.11–1.88), ac = 27.00 (14.50–29.00), M = 0.61 (0.50–0.69), C3F = 0.68 (0.67–0.75).

Type material

Holotype ♂ ( SCAU, 121186) and paratypes 11 ♂, 13 ♀ (four ♂ and four ♀ in KIZ; seven ♂ and nine ♀ in SCAU, Nos 121187–202), CHINA: Mengla, Xishuangbanna , Yunnan, altitude 600–800 m, 17–24 April 2007, HW Chen, JJ Gao, F Zhao.

Etymology

From the Latin word: hamatus, referring to the dorsal projection of gonopods being hooked.

Distribution

China (Yunnan).

Figures

Figure 4. Stegana (Steganina) hamata sp. nov., male terminalia: (A) epandrium, cercus and surstylus; (B) 10th sternite; (C, D) hypandrium, paramere(s), gonopods, aedeagus and aedeagal apodeme. Scale bars: 0.1 mm.