All of these except Lithosaphonecrus and Rhoophilus are found in the eastern Palearctic realm.[3] Synergus has the greatest number of species in Synergini.[6]
A reworking of the entire Cynipidae family published in 2015 transferred three genera formerly included in Synergini to other tribes - Ceroptres to a tribe of its own (Ceroptresini), and Periclistus and Synophromorpha to Diastrophini.[7]
Members of Synergini have lost the ability to create their own galls, and instead make use of galls left behind by other wasps. As a result, they are classified as inquilines.[8] Species in Synergini usually make use of galls made by wasps in tribe Cynipini.[6]