[3][4] A yew artichoke gall caused by the fly Taxomyia taxi also exists, but is unrelated to the oak-borne species.

Previous names or synonyms for the species A. fecundator are A. fecundatrix, A. pilosus, A. foecundatrix (see below), A. gemmarum, A. gemmae, A. gemmaequercus, A. gemmaecinaraeformis and A. quercusgemmae.

A well grown specimen can be 2.0 cm long, dark green or russet, generally developing in June and reaching its full size before autumn.

The hairy catkin galls are oval, pointed, unilocular and unilarval structures, 0.3 cm long, changing colour from pale green to brown.

The flies that arise form these galls are of both sexes and the cycle then starts again after they have mated and eggs are laid in the oak buds.

Andricus curvator, the causative agent of the 'collared-bud gall' shows a marked preference for depositing its eggs on buds already colonised by A. fecundator.