Trichacis Förster, 1856

Awad, Jessica, Krogmann, Lars & Talamas, Elijah, 2023, Taxonomic history and review of the Förster genera of Platygastridae (Hymenoptera: Platygastroidea), European Journal of Taxonomy 875 (1), pp. 1-46 : 38

Genus Trichacis Förster, 1856

Figs 22–23

Trichacis Förster, 1856: 108 , 115. Type species Trichacis pisis ( Walker, 1835) by subsequent designation by Ashmead 1893: 294.

Trichasis Förster, 1856 – Thomson 1859: 78. — Vlug 1995: 84 (misspelling).

Remarks

Trichacis is characterized by a tuft of setae on the mesoscutellum and a round or ovoid head (as opposed to the blocky head of Isocybus ). Species of Trichacis typically have a smooth or finely sculptured frons with transverse striation or rugulae above the toruli. Upon its description, Förster included T. didas ( Walker, 1835 ), T. pisis ( Walker, 1835) , and T. remulus ( Walker, 1835) . Trichacis pisis was designated as the type species by Ashmead (1983). The NHMW includes one female original exemplar of T. tristis , a species for which there is no known type material. We here designate this specimen (NHMW-HYM#0005319) as the neotype of Platygaster tristis Nees, 1834 .

Figures

Fig. 22. Trichacis pisis (Walker, 1835), lectotype, ♂ (NMINH_2018_11_24).

Fig. 23. Trichacis tristis (Nees, 1834), neotype, ♀ (NHMW-HYM#0005319). A. Lateral habitus. B. Anterior head. C. Dorsal mesosoma and metasoma. D. Dorsal head. E. Labels.