Euura amerinae
Euura amerinae is a species of sawfly belonging to the family Tenthredinidae. The larvae form galls on bay willow. It was first described by Carl Linnaeus in 1758.
Description
The gall is a globular swelling, up to wide and long, on the shoots of bay willow. As the gall matures the surface becomes cracked. According to Redfern et al. the gall contains one or several larvae in indistinct chambers, while the website Plant Parasites of Europe suggests the galls have circa four cells, each with a single larva and Liston et al. state that several larvae normally inhabit the gall. E. piliserra and this species are the only European gall-inducing sawfly with several larvae in a single gall. Pupation takes place in the gall.E. amerinae is one of three closely related species known as the Euura amerinae species subgroup. The other members of the group are E. venusta and E. testaceipes.