Stegana (Steganina) rhomboica, 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 : 2007-2009

Stegana (Steganina) rhomboica sp. nov.

( Figure 8 )

Diagnosis

This species is similar to S. hirticeps sp. nov. in the cercus lacking pubescence ( Figure 8A ), the shapes of paramere and aedeagus ( Figure 8C, D ), can be differentiated from it by having the dorsal projection of gonopods slightly curved dorsad, lacking

serrated, minute processes ( Figure 8D, E ), aedeagus with serrated, minute processes, lacking pubescence ( Figure 8C, D ).

Description

Frons nearly black, lacking minute setulae. Fronto-orbital plate brownish yellow above, brown below. Pedicel and first flagellomere mostly dark brown. Face brown on upper two-thirds, yellow on lower margin. Clypeus brown medially, yellow laterally. Scutum black on anterior quarter, yellow posteriorly. Basisternum yellow. Scutellum mostly brown, yellow at tip, sometimes nearly brownish. Wing brown anteriorly, yellowish posteriorly, black on all crossveins. Fore femur with one row of four suberect setae on ventral surface. Abdominal tergites brownish yellow on first to third, brown on fourth to sixth. Sternites yellow on second to fourth, brown on fifth and sixth, slightly wider than length. Male terminalia: surstylus lacking prensiseta and minute processes on outer surface ( Figure 8A ). Tenth sternite slightly vaulted, broadened basolaterally ( Figure 8B ). Hypandrium narrowly protruded anteromedially ( Figure 8C ). Paramere distinctly protruded and with four sensilla ( Figure 8C, D ). Aedeagus slightly rhombic distally ( Figure 8C, D ).

Measurements

BL = 2.92 mm in holotype (range in three ♂ and five ♀ paratypes: 2.68–3.12 in ♂, 2.60–3.00 in ♀), ThL = 1.52 mm (1.28–1.48 in ♂, 1.26–1.64 in ♀), WL = 2.44 mm (2.48–2.76 in ♂, 2.44–2.92 in ♀), WW = 1.20 mm (1.12–1.40 in ♂, 1.00– 1.44 in ♀), arb = 10 / 6 (10–14 / 5–7), avd = 0.83 (0.71–0.86), adf = 1.20 (0.86–1.40), flw = 2.00 (1.71–2.20), FW / HW = 0.48 (0.33–0.54), ch / o = 0.20 (0.11–0.24), prorb = 0.91 (0.83–1.13), rcorb = 0.55 (0.46–0.75), vb = 0.45 (0.26–0.60), dcl = 0.45 (0.31–0.57), presctl = 0.54 (0.42–0.63), sctl = 2.00 (1.82–2.21), sterno = 0.73 (0.50–0.84), orbito = 1.80 (1.50–1.80), dcp = 0.23 (0.19–0.26), sctlp = 2.00 (1.50–2.22), C = 1.79 (1.81–2.00), 4c = 1.48 (1.30–1.52), 4v = 2.17 (1.79–2.44), 5x = 1.27 (1.54–2.40), ac = 17.00 (17.50–20.50), M = 0.61 (0.66–0.80), C3F = 0.65 (0.58–0.76).

Type material

Holotype ♂ ( SCAU, No. 121279), CHINA: Mount Wuliang, Jingdong , Yunnan, altitude 2230 m, 5 August 2006, HZ Cao . Paratypes: one ♂, six ♀ ( SCAU, Nos. 121280–86), 27, 28 July 2006, 5 August 2006, HL Cao, HZ Cao, T Li, same data as holotype ; six ♂, four ♀ (one ♂ and one ♀ in KIZ; five ♂ and three ♀ in SCAU, Nos. 121287–94), Mount Maoer, Guilin , Guangxi, altitude 700 m, 23 October 2004, HW Chen, MF Xu, XL Zhang .

Etymology

From the Greek word: rhombos, referring to the aedeagus being slightly rhombic distally.

Distribution

China (Guangxi, Yunnan) .

Figures

Figure 8. Stegana (Steganina) rhomboica sp. nov., male terminalia: (A) epandrium, cercus and surstylus; (B) 10th sternite; (C, D) hypandrium, paramere(s), gonopods, aedeagus and aedeagal apodeme; (E) gonopods. Scale bars: 0.1 mm.