Tachytrechus giganteus (Brooks)

Brooks, Scott E. & Cumming, Jeffrey M., 2008, The Tachytrechus alatus species group (= Syntomoneurum Becker) revisited: new species and revised species group limits (Diptera: Dolichopodidae), Zootaxa 1676, pp. 1-27 : 14

Tachytrechus giganteus (Brooks)

(Figs. 6, 13)

Syntomoneurum giganteum Brooks in Brooks and Wheeler 2002: 321. Tachytrechus giganteus ( Brooks) : Brooks (2005).

Diagnosis. Large; body length 7.6–8.5 mm, wing length 10–11 mm; male face silvery, strongly depressed with vertical median line in male; female face dull metallic green with grey sides; male clypeus parallel sided and truncate below (Fig. 6C); 1 notopleural bristle; male fore tarsus unmodified; hind femur dark metallic green, male with 2–3 anterior preapical bristles, female with 1–2 anterior preapical bristles; M with weak obtuse, sinuous bend in distal half; R4+5 and M convergent distally (Figs. 6A, 6B); male wing with elongate costal swelling along middle third (Fig. 6A) extended to insertion point of R2+3, anterior margin of costal swelling with very fine setae; abdominal tergite 5 of male with large posterior membranous region, extended laterally towards ventral margin of sclerite; hypopygium (Figs. 6D, 6E): basiventral epandrial lobe welldeveloped, elongate, curved and tapered apically; apicoventral epandrial lobe weakly developed with rounded apex, short, projected posteriorly; accessory epandrial process absent; ventral surstylar lobe with denticulate ventral surface; apicolateral arm of postgonite with medial process present, apex rounded, unmodified; cercus rounded in dorsal view with strong, black setae on apical margin, margin not darkened; hypandrium asymmetrical in ventral view, rugose dorsolaterally; middle third of phallus with weak dentiform projection proximally and rounded fin-like projection distally. Female sternite 8 undivided, heavily sclerotized, with deep medial invagination.

Type material examined. Holotype ɗ, COLOMBIA: Antioquia, 10 km East of Medellin on road to Las Palmas, 2000 m, 21.ii.1984, C.M. & O.S. Flint, Jr. Paratypes, 1ɗ and 2Ψ, from same locality as holotype ( USNM).

Other material examined. 1ɗ, 2Ψ same data as holotype ( USNM).

Distribution. This species is known only from the type locality near Medellin, Colombia ( Fig. 13 ).

Figures

FIGURE 13. Known distribution of Tachytrechus alatus (Becker), T. analis (Parent), T. dios Brooks sp. nov., T. giganteus (Brooks) and T. peruicus Yang & Zhang.