Cothornobata elegantula, Li, Xuankun, Marshall, Stephen A. & Yang, Ding, 2015

Li, Xuankun, Marshall, Stephen A. & Yang, Ding, 2015, A review of the Oriental species of Cothornobata Czerny (Diptera, Micropezidae, Eurybatinae), Zootaxa 4006 (2), pp. 201-246 : 229

12. Cothornobata elegantula sp. nov.

( Fig. 15 )

Diagnosis. Palpus dark brown. Fore tibia black. Arms of genital fork convergent on distal 1/3, widest point across arms only slightly wider than 1.5X width of base at midpoint; basal tubercles finger-like, contiguous. Postgonite slender and strongly bent, creating a “V-shape”.

Description. Male. Body length 8.0–11.0 mm, wing length 5.0–7.0 mm.

Head mostly subshiny blackish-brown with very thin gray pollinosity. Frontal vitta brown but yellow at apex, densely microsetulose, about 2/3 width of frons; lower orbital plate pollinose; ocellar triangle black; median occipital sclerite with a small dark yellow spot at middle; lunule reddish orange; face pale yellow, densely microsetulose; gena dark yellow, pollinose; clypeus uniformly blackish, shiny. Setae and setulae on head black; postgena with 1 strong seta at lower margin. Antenna brownish-yellow; first flagellomere 1.6X as long as broad; pedicel with 1 ventral apical seta more than half length of first flagellomere; arista nearly 3.5X length of first flagellomere, brown with yellow base, with long pubescence except on distal half. Proboscis dark yellow with brown apex, setulae brown. Palpus dark brown, setulae black.

Thorax black, with pale gray pollinosity. Scutellum slightly convex, angled dorsally. Setae on thorax black, setulae blackish; katepisternum with 3 to 4 strong setae.

Legs mostly dark yellow, except mid and hind coxae brown, apical 1/2 of fore femur black, mid and hind femora with blackish-brown apex; fore tibia black, mid and hind tibiae blackish-brown to brown with base and apex darker, and tarsi blackish-brown with mid basitarsus pale yellow with blackish-brown tip.

Wing generally infuscated except for pale strip posterior to CuA1 and pale circular area (incomplete pale band) above and just beyond dm-cu; discal band and apical infuscation only slightly darker than base of wing.

Wing brown with distal and discal bands dark brown; distal band basal to middle of distal section of M1; discal band along M1 but posterior to R4+5, basal to middle of penultimate section of M1. Bm-cu proximal to CuA2, A1+CuA2 2.4X as long as CuA2; distance between apex of R2+3 and R4+5 0.5X as long as M1 beyond dm-cu ( Fig. 15 C). Halter pale yellow but dark yellow at base.

Abdomen mostly blackish-brown with pale gray pollinosity, tergites 2–5 pale yellow apically with pale gray pollinosity. Pleuron pale gray. Epandrium blackish-brown. Genital fork blackish-brown to black, with blackishbrown to black setulae; arms strongly divergent basally and convergent on distal 1/3, widest point across arms only slightly wider than 1.5X width of base at midpoint; basal tubercles finger-like, contiguous, medial tubercle strong, broadly convex ( Fig. 15 D). Distiphallus inflated apically, glans present. Pregonite long and expanded apically. Postgonite slender and strongly bent, creating a “V-shape” (best viewed ventrally) ( Fig. 15 GH).

Female. Unknown.

Type material. HOLOTYPE: VIETNAM, Ninh Binh Province: Cuc Phuong National Park, 400 m, 16.v.2012, Xingyue Liu (♂, CAU). PARATYPE: same data as holotype (1 ♂, CAU).

Distribution. Oriental: Vietnam (Ninh Binh).

Remarks. Cothornobata elegantula is similar to C. atra sp. nov., but differs as follows: postocellar seta present; bm-cu proximal to CuA2; postgonite slender and strongly bent, creating a “V-shape”.

Etymology. The specific name refers to the postgonite which forms an “elegant” and distinctive structure.

Figures

FIGURE 15. Cothornobata elegantula sp. nov., male. A, left lateral; B, head; C, wing; D, genital fork; E, genitalia, left lateral; F, genitalia, posterior; G, aedeagus and associated structures, left lateral; H, aedeagus and associated structures, ventral; I, back of head, showing inner and outer vertical setae and postocellar seta (Red spots mark the setal bases). Scale bars = 1 mm. Abbreviations: i vt s, inner vertical seta; o vt s, outer vertical seta; poc s, postocellar seta.