Hymenoptera: Cynipidae - gall wasp Andricus legitimus Agamic generation - photographs on Quercus, Oak Hosts: Only agamic generation known, on Quercus petraea, robur Forms a unilocular, ovoid gall within an aborted acorn which remains more/less completely enclosed in the cupula. Galls with several chambers have been affected by an iniquiline, possibly Synergus clandestinus, an iniquiline of A. legitimus and other acorn-galling Andricus species

Andricus legitimus
Broomhill, Dorset. November 2017