Illuminating a Dark Taxon: Revision of European Trichacis Förster (Hymenoptera Platygastridae) reveals a glut of synonyms Author Awad, Jessica State Museum of Natural History Stuttgart, Rosenstein 1, 70191 Stuttgart; University of Hohenheim, Institute of Biology, Biological Systematics (190 w), 70599 Stuttgart, Germany. Author Krogmann, Lars 0000-0002-3724-1735 State Museum of Natural History Stuttgart, Rosenstein 1, 70191 Stuttgart; University of Hohenheim, Institute of Biology, Biological Systematics (190 w), 70599 Stuttgart, Germany. & lars. krogmann @ smns-bw. de; https: // orcid. org / 0000 - 0002 - 3724 - 1735 lars.krogmann@smns-bw.de Author Talamas, Elijah 0000-0002-1048-6345 Florida Department of Agriculture and Consumer Services, Division of Plant Industry, Gainesville, FL, USA. elijah. talamas @ fdacs. gov; https: // orcid. org / 0000 - 0002 - 1048 - 6345 elijah.talamas@fdacs.gov text Zootaxa 2023 2023-05-08 5278 3 563 577 http://dx.doi.org/10.11646/zootaxa.5278.3.8 journal article 53604 10.11646/zootaxa.5278.3.8 22a9d0bb-946a-41d8-8632-60e0041bb5fa 1175-5326 7906722 21E1839C-A08E-422F-8F25-70DD84205CF6 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 ).