Synergus campanula Osten-Sacken, 1865

Lobato-Vila, Irene & Pujade-Villar, Juli, 2021, The genus Synergus Hartig (Hymenoptera: Cynipidae: Synergini) in the New World: a complete taxonomic revision with a key to species, Zootaxa 4906 (1), pp. 1-121 : 28

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 .