Euura myrtilloides

Euura myrtilloides is a species of sawfly belonging to the family Tenthredinidae (common sawflies) and the larvae forms galls on swamp willow (Salix myrtilloides). It was first described by Jens-Peter Kopelke in 1996. E. myrtilloides is one of a number of closely related species which is known as the Euura atra subgroup.

Description
The gall is often low down on the plant and is a conspicuous, elongated swelling on young branches. The larvae over-winter in the gall.

Other similar looking galls in the Euura atra subgroup are,
 * E. atra, found on white willow (S. alba) and crack willow (S. fragilis)
 * E. auritae, found on eared willow (S. aurita)
 * E. salicispurpureae, found on purple willow (S. purpurea)
 * E. weiffenbachiella, found on creeping willow (S. repens) and S. rosmarinifolia.

Distribution
Recorded from Finland and Norway.