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 laeviventris ( Osten-Sacken, 1861 ) Synophrus laeviventris Osten Sacken, 1861 . Proc. Entomol. Soc. Phil. 1: 57. Type material: MCZ. Synergus laeviventris : Osten-Sacken (1865) . Proc. Entomol. Soc. Phil. 4: 375. Diagnosis . See Lobato-Vila et al . (2020c: 19) . Distribution . USA : Washington D.C. ( Osten-Sacken 1861 ; Burks 1979 ), Colorado , and Michigan ( Gillette 1896 ). Biology . Reared from galls of Amphibolips confluenta ( Harris, 1841 ) on Q. rubra ( Osten-Sacken 1861 ) ; from galls of Amphibolips quercusspongifica ( Osten-Sacken, 1862 ) , Atrusca quercuscentricola ( Osten-Sacken, 1861 ) , as well as from an unnamed gall on Q. falcata described by Osten-Sacken (1861) ( Osten-Sacken 1865 ); and from galls of Disholcaspis rubens ( Gillette, 1893 ) and D. quercusglobulus ( Fitch, 1859 ) ( Gillette 1896 ) . Remarks . The type material of Synergus laeviventris was examined and the species was redescribed and illustrated by Lobato-Vila et al . (2020c: 19) . The host plant is not mentioned neither for Amphibolips quercusspongifica , Atrusca quercuscentricola , Disholcaspis rubens nor D. quercusglobulus . However, and according to Burks (1979) , A. quercusspongifica is associated with oaks of the Lobatae section ( Q. coccinea , Q. marilandica , and Q. velutina ); Atrusca quercuscentricola , with Q. stellata ; Disholcaspis rubens , with some species of oaks from Quercus section ( Q . arizonica , Q. x undulata , Q. gambelii , Q. oblongifolia , Q. rugosa , Q. turbinella , and Q. toumeyi ); and D. quercusglobulus , with oaks from Quercus section ( Q. alba , Q. prinoides , and ‘ Q. prinus ’).