Microgaster chacoensis Cameron, 1908 Janzen et al., 2003Janzen, D.H., A.K. Walker, J.B. Whitfield, G. Delvare, & I.D. Gauld 2003. Host-specificity and hyperparasitoids of three new Costa Rican species of Microplitis Foerster (Hymenoptera: Braconidae: Microastrinae), parasitoids of Sphingid caterpillars. 12:42-76.:57, Type, examined (Natural History Museum, London); Fernández et al., 2020Fernández-Triana, J.L., M.R. Shaw, C. Boudreault, M. Beaudin & G.R. Broad 2020. Annotated and illustrated world checklist of Microgastrinae parasitoid wasps (Hymenoptera, Braconidae). ZooKeys 920:1-1089.:755, Holotype ♀, examined (NHMUK). - As Microplitis chacoensis: - Janzen et al., 2003Janzen, D.H., A.K. Walker, J.B. Whitfield, G. Delvare, & I.D. Gauld 2003. Host-specificity and hyperparasitoids of three new Costa Rican species of Microplitis Foerster (Hymenoptera: Braconidae: Microastrinae), parasitoids of Sphingid caterpillars. 12:42-76. (distribution); Fernández et al., 2020Fernández-Triana, J.L., M.R. Shaw, C. Boudreault, M. Beaudin & G.R. Broad 2020. Annotated and illustrated world checklist of Microgastrinae parasitoid wasps (Hymenoptera, Braconidae). ZooKeys 920:1-1089. (distribution).
Microplitis ayerzai Brèthes, 1910 Janzen et al., 2003Janzen, D.H., A.K. Walker, J.B. Whitfield, G. Delvare, & I.D. Gauld 2003. Host-specificity and hyperparasitoids of three new Costa Rican species of Microplitis Foerster (Hymenoptera: Braconidae: Microastrinae), parasitoids of Sphingid caterpillars. 12:42-76.:57, Type, examined (National Natural History Museum, Buenos Aires). Synonymized with Microplitis chacoensis (Cameron, 1908) by Janzen et al., 2003Janzen, D.H., A.K. Walker, J.B. Whitfield, G. Delvare, & I.D. Gauld 2003. Host-specificity and hyperparasitoids of three new Costa Rican species of Microplitis Foerster (Hymenoptera: Braconidae: Microastrinae), parasitoids of Sphingid caterpillars. 12:42-76.:57. - Fernández et al., 2020Fernández-Triana, J.L., M.R. Shaw, C. Boudreault, M. Beaudin & G.R. Broad 2020. Annotated and illustrated world checklist of Microgastrinae parasitoid wasps (Hymenoptera, Braconidae). ZooKeys 920:1-1089.:755 ( listed as synonym of Microplitis chacoensis (Cameron, 1908)).