The genus Synergus Hartig (Hymenoptera: Cynipidae: Synergini) in the New World: a complete taxonomic revision with a key to species Author Lobato-Vila, Irene Author Pujade-Villar, Juli 0000-0001-7798-2717 jpujade@ub.edu text Zootaxa 2021 2021-01-12 4906 1 1 121 journal article 8839 10.11646/zootaxa.4906.1.1 308129a3-a99f-4012-bb41-d3220692c398 1175-5326 4434000 09383AAD-8E30-4E50-A533-C6DA4D00E33C Synergus campanula Osten-Sacken, 1865 Synergus campanula Osten-Sacken, 1865 . Proc. Entomol. Soc. Phil. 4: 376. Type material: MCZ. Diagnosis . See Lobato-Vila et al . (2020c: 12) . Distribution . USA : Illinois , New Jersey , New York , Washington D.C. , and Wisconsin ( Burks 1979 ). Biology . Reared from asexual galls of Disholcaspis quercusglobulus ( Fitch, 1859 ) on a white oak, and from similar galls described by Osten-Sacken (1861) on an unknown oak ( Osten-Sacken 1865 ), which may correspond to Disholcaspis quercusmamma (Walsh, 1869) (= Holcaspis duricoria Bassett, 1890 ) on Q. bicolor ( Gillette 1896 ) . Also, from galls of D. quercusmamma and Trigonaspis ? quercusforticorne ( Walsh, 1864 ) (= Biorhiza forticornis ( Walsh, 1864 )) ( Gillette 1896 ) , the latter considered incertae sedis after Pujade-Villar et al. (2018) . Remarks . The type material of Synergus campanula was examined and the species was redescribed and illustrated by Lobato-Vila et al . (2020c: 11) . The host plant is not mentioned in the original description, but D. quercusglobulus was found on Q. alba and Q. prinoides ( Burks 1979: 1092 ) . Also, recorded from Q. prinus , but this name applies to two different species: Q. muehlenbergii and Q. montana .