Synergus cultratus Ritchie & Shorthouse, 1987:231, ♂♀. Allotype ♂, Huehuetenango 3S, Gate[mala], 8.18.37 (AMNH); Holotype ♀, Huehuetenango 3S, Gate[mala], 8.18.37 (AMNH); Lobato-Vila et al., 2019Lobato-Vila, I., D. Cibrián-Tovar, U.M. Barrera-Rutz, A.Equihua-Martínez, E.G. Estrada-Vebegas, M.L. Buffington & J. Pujade-Villar 2019. Review of the Synergus Hartig species (Hymenoptera: Cynipidae: Synergini) associated with tuberous and other tumor-like galls on oaks from the New World with the description of three new species from Mexico. Proceedings of the Entomological Society of Washington 121 (2):193-255.:206, Holotype ♀, examined (AMNH); Lobato-Vila & Pujade-Villar, 2021Lobato-Vila, I. & J. Pujade-Villar 2021. The genus Synergus Hartig (Hymenoptera: Cynipidae: Synergini) in the New World: a complete taxonomic revision with a key to species. Zootaxa 4906 (1):1-121.:35, Holotype (AMNH). - Nieves-Aldrey, 2005Nieves-Aldrey, J. L. 2005. Notes on the Neotropical species of Synergus (Hymenoptera, Cynipidae), with description of a new species from Colombia. The Canadian Entomologist 137:501-508. (distribution); Medianero & Nieves-Aldrey, 2011Medianero, E. & J.L. Nieves-Aldrey 2011. Primer estudio de las avispas de las agallas de la República de Panamá, incluyendo una lista actualizada de los cinípidos neotropicales (Hymenoptera, Cynipoidea, Cynipidae). Boletín de la Sociedad Entomológica Aragonesa 48:89-104. (distribution); Nieves-Aldrey & Medianero, 2011Nieves-Aldrey, J. L. & E. Medianero 2011. Taxonomy of inquilines of oak gall wasps of Panama, with description of eight new species of Synergus Hartig (Hymenoptera, Cynipidae, Synergini). Zootaxa 2774:1-47. (distribution); Pénzes et al., 2012Pénzes, Z. C.-T. Tang, P. Bihari, M. Bozsó, S. Schwéger & G. Melika 2012. Oak associated inquilines (Hymenoptera, Cynipidae, Synergini). TISCIA monograph series 11:1-76. (distribution); Lobato-Vila & Pujade-Villar, 2021Lobato-Vila, I. & J. Pujade-Villar 2021. The genus Synergus Hartig (Hymenoptera: Cynipidae: Synergini) in the New World: a complete taxonomic revision with a key to species. Zootaxa 4906 (1):1-121. (distribution).