Synergus filicornis Cameron, 1883:72, ♀. ♀, Guatemala, San Gerónimo (leg. Champion); Weld, 1930Weld, L.H. 1930. Notes on types (Hymenoptera: Cynipidae). Proceedings of the Entomological Society of Washington 32 (8):137-144.:143, Holotype ♀ (British Museum); Ritchie & Shorthouse, 1987Ritchie, A.J. & Shorthouse, J.D. 1987. A review of the species of Synergus from Guatemala, with notes on Cynips guatemalensis Cameron (Hymenoptera: Cynipidae). Proceedings of the Entomological Society of Washington 89 (2):230-241.:234, Holotype ♀, examined (BMNH); Lobato-Vila et al., 2020Lobato-Vila, I., D. Cibrián-Tovar, U.M. Barrera-Ruíz, A. Equihua-Martínez, E.G. Estrada-Venegas, E. Tovar-Sánchez, E. Catillo-Mendoza, M.L. Buffington & J. Pujade-Villar 2020. Review of the Synergus Hartig species (Hymenoptera: Cynipidae: Synergini) associated with woolly galls on oaks from the New World, with the description of a new species from Mexico. Proceedings of the Entomological Society of Washington 122 (3):678-715.:686, Type, examined (NHMUK); 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.:56, Type material (NHMUK). - Cameron, 1883-1888Cameron, P. 1883-1888. Biologia Centrali-Americana - Insecta. Hymenoptera. (Families Tenthredinidae-Chrysididae). Taylor and Francis, Red Lion Court, Fleet Street. 487 pp., 20 pl.:72 (listed); Dalla Torre, 1893Dalla Torre, C.G. 1893. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, Volumen II: Cynipidae. Breitkopf & Härtel, Leipzig. VIII + 140. (distribution); Weld, 1930Weld, L.H. 1930. Notes on types (Hymenoptera: Cynipidae). Proceedings of the Entomological Society of Washington 32 (8):137-144. (distribution); Ritchie & Shorthouse, 1987Ritchie, A.J. & Shorthouse, J.D. 1987. A review of the species of Synergus from Guatemala, with notes on Cynips guatemalensis Cameron (Hymenoptera: Cynipidae). Proceedings of the Entomological Society of Washington 89 (2):230-241. (distribution); 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); Pujade-Villar et al., 2016Pujade-Villar, J., M. Roca-Cusachs & I. Lobato-Vila 2016. Descripción de las primeras especies de Synergus con hembras de 13 antenómeros para México (Hymenoptera: Cynipidae: Synergini). Dugesiana 23 (2):109-116. (distribution); Lobato-Vila & Pujade-Villar, 2018Lobato-Vila, I. & J. Pujade-Villar 2018. Estado actual del conocimiento de la diversidad de inquilinos de agallas de Cinípidos en encinos de México (Hymenoptera: Cynipidae). Entomología mexicana 5:435-443. (distribution); Lobato-Vila et al., 2020Lobato-Vila, I., D. Cibrián-Tovar, U.M. Barrera-Ruíz, A. Equihua-Martínez, E.G. Estrada-Venegas, E. Tovar-Sánchez, E. Catillo-Mendoza, M.L. Buffington & J. Pujade-Villar 2020. Review of the Synergus Hartig species (Hymenoptera: Cynipidae: Synergini) associated with woolly galls on oaks from the New World, with the description of a new species from Mexico. Proceedings of the Entomological Society of Washington 122 (3):678-715. (distribution); Nastasi & Deans, 2021Nastasi, L.F. & A.R. Deans 2021. Catalogue of Rose Gall, Herb Gall, and Inquiline Gall Wasps (Hymenoptera: Cynipidae) of the United States, Canada and Mexico. Biodiversity Data Journal 9 (e68558):1-41. (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).
Synergus similis Gillette, 1896:92, Lobato-Vila et al., 2020Lobato-Vila, I., D. Cibrián-Tovar, U.M. Barrera-Ruíz, A. Equihua-Martínez, E.G. Estrada-Venegas, E. Tovar-Sánchez, E. Catillo-Mendoza, M.L. Buffington & J. Pujade-Villar 2020. Review of the Synergus Hartig species (Hymenoptera: Cynipidae: Synergini) associated with woolly galls on oaks from the New World, with the description of a new species from Mexico. Proceedings of the Entomological Society of Washington 122 (3):678-715.:687, Lectotype ♀ (USNM, AccNo71950); 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.:56, Type material (USNM). Synonymized with Synergus filicornis Cameron, 1883 by Lobato-Vila et al., 2020Lobato-Vila, I., D. Cibrián-Tovar, U.M. Barrera-Ruíz, A. Equihua-Martínez, E.G. Estrada-Venegas, E. Tovar-Sánchez, E. Catillo-Mendoza, M.L. Buffington & J. Pujade-Villar 2020. Review of the Synergus Hartig species (Hymenoptera: Cynipidae: Synergini) associated with woolly galls on oaks from the New World, with the description of a new species from Mexico. Proceedings of the Entomological Society of Washington 122 (3):678-715.:686. - Lobato-Vila et al., 2020Lobato-Vila, I., D. Cibrián-Tovar, U.M. Barrera-Ruíz, A. Equihua-Martínez, E.G. Estrada-Venegas, E. Tovar-Sánchez, E. Catillo-Mendoza, M.L. Buffington & J. Pujade-Villar 2020. Review of the Synergus Hartig species (Hymenoptera: Cynipidae: Synergini) associated with woolly galls on oaks from the New World, with the description of a new species from Mexico. Proceedings of the Entomological Society of Washington 122 (3):678-715. (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.:56 ( listed as synonym of Synergus filicornis Cameron, 1883).
Synergus furnessana Weld, 1913:134, Ritchie & Shorthouse, 1987Ritchie, A.J. & Shorthouse, J.D. 1987. A review of the species of Synergus from Guatemala, with notes on Cynips guatemalensis Cameron (Hymenoptera: Cynipidae). Proceedings of the Entomological Society of Washington 89 (2):230-241.:234, Holotype, examined (PANS); Lobato-Vila et al., 2020Lobato-Vila, I., D. Cibrián-Tovar, U.M. Barrera-Ruíz, A. Equihua-Martínez, E.G. Estrada-Venegas, E. Tovar-Sánchez, E. Catillo-Mendoza, M.L. Buffington & J. Pujade-Villar 2020. Review of the Synergus Hartig species (Hymenoptera: Cynipidae: Synergini) associated with woolly galls on oaks from the New World, with the description of a new species from Mexico. Proceedings of the Entomological Society of Washington 122 (3):678-715.:686, Holotype (ANSP); 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.:56, Holotype (ANSP). Synonymized with Synergus filicornis Cameron, 1883 by Weld, 1930Weld, L.H. 1930. Notes on types (Hymenoptera: Cynipidae). Proceedings of the Entomological Society of Washington 32 (8):137-144.:143. - Ritchie & Shorthouse, 1987Ritchie, A.J. & Shorthouse, J.D. 1987. A review of the species of Synergus from Guatemala, with notes on Cynips guatemalensis Cameron (Hymenoptera: Cynipidae). Proceedings of the Entomological Society of Washington 89 (2):230-241.:234 ( listed as synonym of Synergus filicornis Cameron, 1883); Pujade-Villar et al., 2016Pujade-Villar, J., M. Roca-Cusachs & I. Lobato-Vila 2016. Descripción de las primeras especies de Synergus con hembras de 13 antenómeros para México (Hymenoptera: Cynipidae: Synergini). Dugesiana 23 (2):109-116.:109 ( listed as synonym of Synergus filicornis Cameron, 1883); Lobato-Vila & Pujade-Villar, 2017Lobato-Vila, I. & Pujade-Villar, J. 2017. Description of five new species of inquiline oak gall wasps of the genus Synergus Hartig (Hymenoptera, Cynipidae: Synergini) with partially smooth mesopleurae from Mexico. Zoological Studies 56 (36):1-28.:2 ( listed as synonym of Synergus filicornis Cameron, 1883); Lobato-Vila & Pujade-Villar, 2018Lobato-Vila, I. & J. Pujade-Villar 2018. Estado actual del conocimiento de la diversidad de inquilinos de agallas de Cinípidos en encinos de México (Hymenoptera: Cynipidae). Entomología mexicana 5:435-443.:438 ( listed as synonym of Synergus filicornis Cameron, 1883); Lobato-Vila et al., 2020Lobato-Vila, I., D. Cibrián-Tovar, U.M. Barrera-Ruíz, A. Equihua-Martínez, E.G. Estrada-Venegas, E. Tovar-Sánchez, E. Catillo-Mendoza, M.L. Buffington & J. Pujade-Villar 2020. Review of the Synergus Hartig species (Hymenoptera: Cynipidae: Synergini) associated with woolly galls on oaks from the New World, with the description of a new species from Mexico. Proceedings of the Entomological Society of Washington 122 (3):678-715.:686 ( listed as synonym of Synergus filicornis Cameron, 1883); 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.:56 ( listed as synonym of Synergus filicornis Cameron, 1883).