Trichacis triangulata 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: 39-42

publication ID

10.5281/zenodo.281325

persistent identifier

http://treatment.plazi.org/id/038EFC5F-7C67-D46C-FF7B-FA27BB59FE43

treatment provided by

Plazi

scientific name

Trichacis triangulata Arias-Penna & Masner
status

new species

Trichacis triangulata Arias-Penna & Masner  , new species

Figures 18View FIGURE 18 F– 18 H; 19; 20 A– 20 F

Female. Body length: 2.05 mm (holotype); 1.95–2.20 mm (paratypes, n= 3); mean length ± SD = 2.09 ± 0.11 mm. Black; A 1 –A 10 brown; mandible black with apex brown; fore leg yellow; mid leg brown, with apical ½ of tibia darker; hind leg brown, with tarsi and apical ½ of femur and tibia darker; fore coxa brown; hind coxa dark brown, fore wing infuscate.

Head, in dorsal view, 2.6 times as wide as long; EH < IOSAbout IOS; interocellar area finely coriaceous; OOL > LOL; antennal clava 3 -segmented; A 1 not reaching vertex dorsal margin; A 2 –A 4 and A 10 longer than wide; A 5 –A 6 as long as wide; A 7 –A 9 wider than long; base of mandible smooth; frons above torulus and interantennal process coriaceous with three marked transverse striae; interantennal process surpassing ventral margin of torulus; clypeus exposed; clypeal margin convex medially; gena striate; vertex with lateral region coriaceous and with medial region smooth between posterior ocellus and hyperoccipital carina and coriaceous between hyperoccipital carina and occipital carina; temple projection absent; hyperoccipital carina complete; distance between posterior ocellus and hyperoccipital carina shorter than posterior ocellus diameter.

Mesosoma arched; antero-admedian line present; notaulus anteriorly incomplete; lateral notaular area with coriaceous sculpture along its anterior margin; inter-notaular area with basal 1 / 3 coriaceous and posterior 2 / 3 smooth; posteromedial region of inter-notaular area convex; parapsidal line present; central pronotal area with posterior half coriaceous; specialized area of mesoscutellum with broad triangular sheet-like projection, moderately elevated; mesopleural carina incomplete (length of mesopleural carina/length of mesopleuron = 0.29); fore wing distinctly surpassing apex of metasoma.

Metasoma elongate; combined length of T 3 –T 6 <T 2; T 1 shorter than wide; T 2 slightly longer than wide; anteromedial area of T 2 smooth and flattened; T 3 anterior margin smooth and with shallow punctuation; T 4 –T 6 densely covered by deep punctuation; T 6 subtriangular.

Male. Body length: 2.20 mm (allotype); 1.95–2.30 mm (paratypes, n= 10); mean length ± SD = 2.09 ± 0.11 mm.

Similar to female except the following: head, in dorsal view, twice as wide as long; EH < IOSAbout IOS; antenna filiform; A 5, A 7 –A 9 longer than wide; T 1 –T 2 longer than wide.

Etymology. The name of the species refers to the shape of its specialized area of the mesoscutellum.

Diagnosis. Trichacis triangulata  is the only species to have the combination of the following characters: distance between posterior ocellus and hyperoccipital carina shorter than posterior ocellus diameter; T 1 shorter than wide, and specialized area of mesoscutellum with broad triangular sheet-like projection.

Material examined. Holotype: 1 Ƥ, MEXICO, Oax, 26 km E Valle Nacional, 1220 m, June 25 1983, M. Kaulbars & S. Peck; allotype: 1 3, with same data as holotype ( CNCIAbout CNCI); paratypes: 9 3, 3 Ƥ, with same data as holotype ( CNCIAbout CNCI), 1 3, with same data as holotype but collected by S. Peck ( ICNAbout ICN).

Holotype is deposited in CNCIAbout CNCI.

IOS

Institute of Oceanographic Sciences

CNCI

Canadian National Collection Insects

ICN

Instituto de Ciencias Naturales, Museo de Historia Natural