Stegana (Steganina) longibarba, Cao, Hua-Zhi & Chen, Hong-Wei, 2008

Cao, Hua-Zhi & Chen, Hong-Wei, 2008, Revision of the Stegana nigrolimbata species group (Diptera: Drosophilidae) from the Oriental Region, Zootaxa 1848, pp. 27-36 : 32-33

Stegana (Steganina) longibarba sp. nov.

(Figs 12–15)

Type material. Holotype ɗ ( FRCK) labeled “ MALAYSIA: Lambir, Sarawak, 1.iii.1999, on fallen logs, M.J. Toda”.

Etymology. A combination of the Latin words: longus and barba, referring to the long filar-like processes of aedeagus.

Diagnosis. Fore tarsomeres with longer fringe-like setae on anterior surface; surstylus deeply bifurcated distally, with minute scale-like processes (Fig. 13); aedeagus with 4 pairs of rod-like processes, one of them twice as long as others (Fig. 14).

Description. Male. Frons and fronto-orbital plate brown. Palpus black. Mesonotum and scutellum yellow brown, without patches and longitudinal stripes. Postpronotal lobe yellow brown on upper 3/5, white on lower 2/5. Katepisternum nearly brown. Legs almost brown, pale on all tarsomeres. Fore femur with 4 setae on median of ventral surface; fore tarsomeres with longer fringe-like setae on anterior surface. Abdominal all tergites and sternites brown. Cercus with sporadic pubescence (Fig. 12). Plate between hypandrium and aedeagus with a few pubescence (Fig. 14).

Measurements. BL = 2.70 mm in holotype; ThL = 1.31 mm; WL = 1.75 mm; WW = 0.85 mm. Indices: arb = 8/7, avd = 0.86, adf = 1.58, flw = 1.90, FW/HW = 0.35, ch/o = 0.05, prorb = 1.46, rcorb = 0.75, vb = 0.21, dcl = 0.48, presctl = 0.58, sctl = 1.78, sterno = (damaged), orbito = 1.88, dcp = 0.20, sctlp = 1.14, C = 1.96, 4c = 1.23, 4v = 1.79, 5x = 1.12, ac = 7.6, M = 0.23, C3F = 0.70.

Distribution. Malaysia (Sabah).

FIGURES 12–15. Stegana (Steganina) longibarba sp. nov., ɗ: 12. Epandrium, surstylus and cercus (lateral view); 13. surstylus (frontal view); 14. hypandrium, aedeagus and aedeagal apodeme (ventral view); 15. base of aedeagus, gonopods and aedeagal apodeme (posterior view) (scale lines = 0.1 mm).