Trichacis depressa Arias-Penna & Masner, new species
Creators: name: Arias-Penna, Tania Milena
name: Masner, Lubomir
name: Delsinne, Thibaut
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Platygastridae
Trichacis
Trichacis depressa

description: Trichacis depressa Arias-Penna & Masner, new species
Figures 7 E, 7F; 8A, 8B
Female. Body length: 2.40 mm (holotype); 1.90–2.70 mm (paratypes, n=4); mean length ± SD = 2.22 ± 0.33 mm. Black; A1–A10 dark brown; mandible yellow with apex brown; fore leg yellow; mid leg with trochanter, femur and base of tibia yellow, otherwise brown; hind leg dark brown; mid coxa yellow; hind coxa brown; fore wing infuscate.
Head, in dorsal view, 2.1 times wider than long; EH> IOS; interocellar area with fine coriaceous sculpture; OOL> LOL; antennal clava 3-segmented; A1 distinctly surpassing vertex dorsal margin; A2–A10 longer than wide; base of mandible smooth; frons between external margin of torulus and inner margin of eye medially covered by delicate coriaceous sculpture; interantennal process truncate, smooth and reaching, but not surpassing, ventral border of torulus; clypeus exposed; clypeal margin truncate; gena smooth; vertex laterally coriaceous and medially smooth; temple projection absent; hyperoccipital carina incomplete: in dorsal view, hyperoccipital carina fading before reaching level of imaginary line connecting eye inner margin to posterior cephalic margin; distance between posterior ocellus and hyperoccipital carina shorter 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; central pronotal area smooth; specialized area of mesoscutellum heart-shaped, moderately elevated, with a rather broad tuft of hairs; mesopleural carina incomplete (length of mesopleural carina/length of mesopleuron = 0.12); fore wing not surpassing apex of metasoma.
Metasoma distinctly elongate and depressed dorsoventrally; combined length of T3–T6> T2; T1–T2 longer than wide; T3–T6 wider than long; anteromedial area of T2 smooth and flattened; T3–T5 with some parts smooth and densely covered by shallow punctuation; T6 densely covered by shallow punctuation along its anterior margin and rest smooth; T6 subtriangular.
Male. Unknown.
Etymology. The name of the species refers to its depressed metasoma.
Diagnosis. Trichacis depressa and T. acarinata have combined length of T3–T6> T2. T. depressa is hitherto the only Neotropical species with a depressed metasoma and with EH> IOS.
Material examined. Holotype: 1 Ƥ, COSTA RICA, San José, Cerro de la Muerte, 19 km S, 3 km W Empalme, 2600 m, April–July 1992, MT, P. Hanson (CNCI); paratypes: 3 Ƥ, with same data as holotype, (2 at CNCI and 1 at ICN); 1 Ƥ S.J. Cerro de la Muerte. November 1992, 2600 m, MT, P. Hanson (CNCI).
Holotype is deposited in CNCI.
description: Published as part of 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, pp. 1-56 in Zootaxa 3337 on pages 17-19, DOI: 10.5281/zenodo.281325