Cynips lignicola Osten-Sacken, 1862:252, ♂♀ - As Synergus lignicola: - Osten Sacken, 1862Osten Sacken, R. 1862. Additions and corrections to the paper entitled 'On the Cynipidae of the North American oaks and their galls'. Proceedings of the Entomological Society of Philadelphia 1:241-259. (distribution).
Synerges rhoditiformis Walsh, 1864:499, ♂♀ - 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.:220 ( listed as synonym of Synergus lignicola (Osten-Sacken, 1862)).
Andricus davisi Beutenmüller, 1907:463 Synonymized with Synergus lignicola (Osten-Sacken, 1862) by 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.:220.