Trichacis delsinnei Arias-Penna & Masner

Arias-Penna, Tania Milena, Masner, Lubomir & Delsinne, Thibaut, 2012, Revision of the Neotropical species of Trichacis Foerster (Hymenoptera: Platygastroidea: Platygastridae), with description of 24 new species, Zootaxa 3337, pp. 1-56 : 17

Trichacis delsinnei Arias-Penna & Masner , new species

Figures 6 H; 7A–7D

Female. Body length: 2.20 mm (holotype).

Black; A1–A6 yellow; A7–A10 brown; mandible brown with base and apex dark brown; fore leg yellow; mid and hind legs with tarsi and tibial apex brown, otherwise yellow; coxae yellow; fore wing infuscate.

Head, in dorsal view, 1.9 times as wide as long; EH <IOS; interocellar area with fine coriaceous sculpture; OOL> LOL; antennal clava 3-segmented; A1 not reaching vertex dorsal margin; A2–A5, A10, A6–A9 as long as wide; base of mandible smooth; frons above torulus coriaceous with 4 marked transverse striae, and above interantennal process weakly striate; interantennal process smooth and surpassing ventral border of toruli; clypeus exposed; clypeal margin convex medially; gena smooth; lateral region of vertex between posterior ocellus and hyperoccipital carina markedly coriaceous, with 9-12 well-separated and irregularly curved longitudinal striae, and 2-3 curved transverse striae running between outer margin of posterior ocellus and inner margin of eye; medial area of vertex smooth; temple projection absent; hyperoccipital carina incomplete, but curving up and merging with stria running along the eye inner margin; distance between posterior ocellus and hyperoccipital carina longer than posterior ocellus diameter.

Mesosoma slightly arched; antero-admedian line present; notaulus anteriorly incomplete; lateral notaular area with coriaceous sculpture along its anterior margin; inter-notaular area with anterior 1/3 coriaceous and smooth in its posterior 2/3; posteromedial region of inter-notaular area broadly convex; parapsidal line present; area of the pronotum between epomiae smooth; specialized area of mesoscutellum heart-shaped and elevated; mesopleural carina incomplete (length of mesopleural carina/length of mesopleuron = 0.39); fore wing slightly surpassing apex of metasoma.

Metasoma elongate; combined length of T3–T6 <T2; T1, T2 shorter than wide; T3–T6 wider than long; anteromedial area of T2 smooth and flattened; T3 finely and densely punctured; T4–T5 and T6 anterior border densely covered by deep punctuation; T6 subtriangular.

Male. Unknown.

Etymology. The species is named in honor of the entomologist Thibaut Dominique Delsinne.

Diagnosis. Trichacis delsinnei , T. pecki and T. fernandezi have an incomplete hyperoccipital carina, which curves up before reaching the eye margin. T. delsinnei is diagnosed by its vertex sculpture and by the broad convexity of its posterior inter-notaular area.

Material examined. Holotype: 1 Ƥ, COSTA RICA, Alajuela, Est. Biol. San Ramón, 900 m, August–November 1995, MT, P. Hanson ( CNCI).

Holotype is deposited in CNCI.

Figures

FIGURE 6. Bright field images of Trichacis species. A – D: Trichacis corrugata Arias-Penna & Masner, n. sp. Ƥ (holotype). A, habitus, dorsal view; B, habitus, lateral view; C, head and anterior mesosoma, dorsal view; D, head and mesosoma, dorsolateral view. E – G: Trichacis costaricana Arias-Penna & Masner, n. sp., Ƥ (holotype). E, head and anteroventral mesosoma, anterior view; F, habitus, dorsal view; G, habitus, lateral view. H: Trichacis delsinnei Arias-Penna & Masner, n. sp., Ƥ (holotype), head, anterior view.