Thecomyia tricuneata Marinoni and Steyskal

Marinoni, Luciane, Steyskal, George C. & Knutson, Lloyd, 2003, Revision and cladistic analysis of the Neotropical Genus Thecomyia Perty (Diptera: Sciomyzidae), Zootaxa 191, pp. 1-36 : 27

12. Thecomyia tricuneata Marinoni and Steyskal , new species ( Figs. 17 , 29 , 40, 41, 42)

Description. Adult. Upper orbital seta strong, well developed. Fronto­orbital spot rounded, width approximately 1/4 of frontal width. Rostrum 0.68­0.7 in males and 0.77­ 0.85 in females as high as eye. White microtomentose infra­ocular marking triangular in lateral view, width 1/2 of the gena length. Mid femur without anteromedial seta. Mid and hind femora wholly yellowish. Mesonotum without distinct stripe, brownish. Ejaculatory apodeme wide apically, anterior margin slightly sinuous, posterior margin concave ( Fig. 17 ). Phallapodeme short, almost straight. Anterior basiphallic process with three pointed processes. Distiphallus with three extensions, not digitiform or slender but broad. Epiphallus concave, not extending to base of distiphallus. Hypandrium in lateral view with dorsal margin convex, anteroventral margin narrow and rounded ( Fig. 29 ). Anteroventral hypandrial plates in frontal view, with margins rounded. Membranous projections of margins of anteroventral hypandrial plates not extending to lateral margins of hypandrium, covered with minute hairs ( Fig. 29 ). Posterior and anterior surstyli distinct; anterior surstylus well developed, bare; posterior rounded ( Fig. 17 ). Female sternites 6, 7 and 8 almost fused, longer than wide; anterior margin of sternite 6 slightly sinuate; mid longitudinal portion almost membranous, with very weak sclerotization, sometimes folded. Spermathecal duct with sclerotized region joining spermatheca long, without apical, digitiform projection (Fig. 40).

Type specimens. HOLOTYPE MALE. 1. Small rectangular label: [ ECUADOR] "Coca, Napo, R., Napo, ECUADOR, 25­30.IV. 65, 250 m., L. Pena" ( CNC). PARATYPES. Same label as on the holotype, 4 m. and 2 f. ( CNC); 1 m. and 2 f. ( DZUP); 1m. ( USNM).

Etymology. The species epithet, tricuneata , is of Latin derivation and is a combination of tri, meaning three, and cuneata, meaning wedge shaped, in reference to the tricuneate anterior basiphallic process.

Figures

FIGURES 15 ­ 17. Male terminalia, left lateral view: 15, Thecomyia papaveroi Marinoni and Steyskal; 16, T. signorelli Marinoni and Steyskal; 17, T. tricuneata Marinoni and Steyskal.

FIGURES 24 ­ 29. Hypandrium, frontal view and right lateral view: 24, Thecomyia chrysacra Marinoni and Steyskal; 25, T. mathisi Marinoni; 26, T. naponica Marinoni and Steyskal; 27, T. papaveroi Marinoni and Steyskal; 28, T. signorelli Marinoni and Steyskal; 29, T. tricuneata Marinoni and Steyskal.