Stegana ( Oxyphortica ) spinosa Cheng and Chen, 2017

Wang, Nannan, Zhang, Yuan, Cheng, Yu & Chen, Hongwei, 2017, Nine new species of the subgenus Stegana (Oxyphortica) from the Oriental region, with morphological and molecular evidence based on Chinese species (Diptera: Drosophilidae), Journal of Natural History 51 (33 - 34), pp. 1943-1970 : 1966-1967

Stegana ( Oxyphortica) spinosa Cheng and Chen , sp. nov.

Diagnosis

Surstylus subbasally with irregular 1 row of ca. 6 somewhat thickened setae along inner margin, distally with two prensisetae ( Figure 15 (b)); aedeagus erect and broadened, acute apically, its medial part sligtly spinulose and with a pair of thorn-like processes, one sheaf of setulae on submedial portion per side ( Figure 15 (c)).

Description

Body colour had been almost lost, because preservation in 70% ethanol for long time. Male terminalia: Epandrium slightly prominent on posterolateral corners, with pubescence and dense setae ( Figure 15 (a)). Cercus lacking pubescence ( Figure 15 (a)). Surstylus basally with a few small setae, submedially curved, distally with ca. 12 long setae except prensisetae ( Figure 15 (b)). Hypandrium with one pair of large flaps anteromedially ( Figure 15 (c)). Parameres slender, fused basally, with ca. 7–8 sensilla ( Figure 15 (c)). Gonopods low-reaching, fused with each other ( Figure 15 (c)).

Measurements

BL = 2.83 mm in holotype, ThL = 1.52 mm, WL = 2.80 mm; WW = 1.18 mm, arb = 8/5, avd = 0.60, adf = 2.27, flw = 2.00, FW/HW = 0.30, ch/o = 0.09, prorb = 0.74, rcorb = 0.71, vb = 0.29, dcl = 0.48, presctl = 0.48, sctl = 1.02, sterno = 0.83, orbito = 1.50, dcp = 0.29, sctlp = 0.95, C = 3.12, 4c = 1.00, 4v = 2.36, 5x = 1.67, ac = 5.00, M = 0.70, C3F = 0.82.

Type specimen

Holotype male ( KPSP), Malaysia: Mahua , Sabah, 4 October 1999, ex tree trunk, MJ Toda.

Etymology

From the Latin word: spinosus (thorny), referring to the aedeagus with numerous spinules.

Distribution

Malaysia ( Sabah).

Figures

Figure 15. Stegana (Oxyphortica) spinosa Cheng and Chen, sp. nov., male terminalia. (a) epandrium, cercus and surstylus (lateral view); (b) surstylus (ventral view); (c) hypandrium, parameres, aedeagus and aedeagal apodeme (ventral view). Scale lines = 0.1 mm.