Trichacis Förster, 1856

Awad, Jessica, Krogmann, Lars & Talamas, Elijah, 2023, Illuminating a Dark Taxon: Revision of European Trichacis Förster (Hymenoptera Platygastridae) reveals a glut of synonyms, Zootaxa 5278 (3), pp. 563-577 : 565

Genus Trichacis Förster, 1856

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

Diagnosis. Head smooth or finely sculptured with transverse striae above the toruli ( Fig. 1E ); female with three to five clavomeres ( Fig. 2A ) as opposed to six in Isocybus ( Fig. 2C ); OOL less than or equal to LOL ( Fig. 1B, E ); mesoscutellum with tuft of setae originating in a depression ( Fig. 1A ).

Figures

FIGURE 1. Genus-level characters of Trichacis and Isocybus. A–B. Trichacis tristis female, SMNS_Hym_Pla_000797; A. Dorsal head and mesosoma, showing broad aspect of clava; B. Dorsal head showing narrow aspect of clava; C. Isocybus female, dorsal habitus, SMNS_Hym_Pla_000880; D. Isocybus female, anterior head, SMNS_Hym_Pla_000851; E. Trichacis tristis female, anterior head, SMNS_Hym_Pla_000805.

FIGURE 2. Antennae of Trichacis and Isocybus. A. T. tristis female, SMNS_Hym_Pla_000217; B. T. tristis male, SMNS_ Hym_Pla_000220; C. Isocybus female (apical antennomere missing), SMNS_Hym_Pla_000870.