Hymenoptera: Cynipidae - gall wasp Andricus aries Ram's-horn Gall Agamic generation (Rams-horn Gall) - photographs on Quercus, Oak Hosts: Agamic generation on Quercus petraea, pubescens, robur Only has an agamic generation in NW Europe Galls very variable owing to distortion by iniquilines and parasitoids. Originally from SE Central Europe, widespread in NW Europe since the start of the 21th century

Andricus aries, Ram's-horn Gall
Upton Heath, Dorset. August 2017