Ceroptres citriformis Ashmead, 1885:300, ♂♀. ♂♂♀♀, 1881; 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.:6, Lectotype ♀, examined (NMNH, Washington D.C., USA); Lobato-Vila et al., 2020Lobato-Vila, I., A. Equihua-Martínez, E.G. Estrada-Vengegas, D. Cibrián-Tovar, U.M. Barrera-Ruíz & J. Pujade-Villar 2020. Synergus Hartig species group (Hymenoptera: Cynipidae: Synergini) with partially smooth mesopleurae from the New World. Zootaxa 4822 (1):1-38.:14, Type (USNM); 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.:683, Type (USNM); 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.:29, Type material (USNM). - Dalla Torre, 1893Dalla Torre, C.G. 1893. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, Volumen II: Cynipidae. Breitkopf & Härtel, Leipzig. VIII + 140. (distribution). - As Synergus citriformis: - Weld, 1922Weld, L.H. 1922. Notes on cynipid wasps, with descriptions of new North American species. Proceedings of the United States National Museum 61 (18):1-29.:26 (comb. nov.); Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 1. Symphyta and Apocrita (Parasitica). Smithsonian Institution Press, Washington D.C. 1-1198. (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, 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. (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., A. Equihua-Martínez, E.G. Estrada-Vengegas, D. Cibrián-Tovar, U.M. Barrera-Ruíz & J. Pujade-Villar 2020. Synergus Hartig species group (Hymenoptera: Cynipidae: Synergini) with partially smooth mesopleurae from the New World. Zootaxa 4822 (1):1-38. (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 niger Fullaway, 1911:369, Lobato-Vila et al., 2020Lobato-Vila, I., A. Equihua-Martínez, E.G. Estrada-Vengegas, D. Cibrián-Tovar, U.M. Barrera-Ruíz & J. Pujade-Villar 2020. Synergus Hartig species group (Hymenoptera: Cynipidae: Synergini) with partially smooth mesopleurae from the New World. Zootaxa 4822 (1):1-38.:14, Lectotype (CAS); 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.:683, Lectotype ♀ (CAS, No. 5829); 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.:29, Lectotype (CAS). Synonymized with Synergus citriformis (Ashmead, 1885) 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.:683. - Lobato-Vila et al., 2020Lobato-Vila, I., A. Equihua-Martínez, E.G. Estrada-Vengegas, D. Cibrián-Tovar, U.M. Barrera-Ruíz & J. Pujade-Villar 2020. Synergus Hartig species group (Hymenoptera: Cynipidae: Synergini) with partially smooth mesopleurae from the New World. Zootaxa 4822 (1):1-38.:14 ( listed as synonym of Synergus citriformis (Ashmead, 1885)); 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.:28 ( listed as synonym of Synergus citriformis (Ashmead, 1885)); 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.:29 ( listed as synonym of Synergus citriformis (Ashmead, 1885)).
Synergus elegans Nieves-Aldrey & Medianero, 2011:4, ♂♀. Holotype ♀, Panama, Chiriquí, Boquete, El Salto, 8º 47' 32.08” N, 82º 27' 37.09” W, 1,431 m, gall collected 07.v.2008 (Museo Nacional de Ciencias Naturales, Madrid, Spain (MNCN), Cat. n° 2095, leg. Medianero & Nieves-Aldrey); 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.:7, Paratypes 2 ♀♀, examined (MNCNM (Madrid, Spain)); 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.:3, Type (MNCNM, Madrid, Spain); Lobato-Vila et al., 2020Lobato-Vila, I., A. Equihua-Martínez, E.G. Estrada-Vengegas, D. Cibrián-Tovar, U.M. Barrera-Ruíz & J. Pujade-Villar 2020. Synergus Hartig species group (Hymenoptera: Cynipidae: Synergini) with partially smooth mesopleurae from the New World. Zootaxa 4822 (1):1-38.:14, Holotype (MNCN); 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.:683, Holotype (MNCN); 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.:29, Holotype (MNCN). Synonymized with Synergus citriformis (Ashmead, 1885) by 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.:6. - 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); 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, 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. (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.:437 ( listed as synonym of Synergus citriformis (Ashmead, 1885)); Lobato-Vila et al., 2020Lobato-Vila, I., A. Equihua-Martínez, E.G. Estrada-Vengegas, D. Cibrián-Tovar, U.M. Barrera-Ruíz & J. Pujade-Villar 2020. Synergus Hartig species group (Hymenoptera: Cynipidae: Synergini) with partially smooth mesopleurae from the New World. Zootaxa 4822 (1):1-38.:14 ( listed as synonym of Synergus citriformis (Ashmead, 1885)); 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.:683 ( listed as synonym of Synergus citriformis (Ashmead, 1885)); 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.:28 ( listed as synonym of Synergus citriformis (Ashmead, 1885)); 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.:29 ( listed as synonym of Synergus citriformis (Ashmead, 1885)).