Euura pedunculi

Formerly placed within the genus Eupontania.

These galls were found on what I was fairly happy was Goat Willow or Sallow Salix caprea (not cinerea as I had accidentally typed here in an earlier version of this page), though I struggle with my willow identification. The first two photos show the same gall from different sides of the leaf - the main gall hanging below the leaf and just a mark on the top. The third photo shows a different older-looking gall nearby (on the same plant if I remember rightly).

Euura pedunculi gall on Grey Willow, Wendling Beck Environment Project (Norfolk, UK), 19th October 2023

I think this was also on Goat Willow Salix caprea though I wasn't convinced it wasn't Grey Willow or their hybrid.

Euura pedunculi gall on Goat Willow (or Grey Willor or their hybrid), Wendling Beck Environment Project (Norfolk, UK), 25th September 2025

I retained the gall above to see if I could breed out the adult. I was successful in this but, despite keeping the pot in my line of sight next to my laptop on my desk, I completely failed to notice when an adult did indeed emerge and it was dead, possibly long dead, before I noticed it later in the winter.

female Euura pedunculi showing forewing, valvula before and after clearing and antennal depressions, emerged from above gall collected on 25th September 2025, Wendling Beck Environment Project (Norfolk, UK)

I wasn't happy putting a name to the willow this one was on, and consequently am not certain of the sawfly gall ID. However it clearly wasn't one of the narrow-leaved species which rules out some of the alternatives, and I suspect it was another pedunculi. I've included a photo showing some leaves in case anyone can confirm.

probable Euura pedunculi gall on Willow sp., County School bridge, North Elmham (Norfolk, UK), 4th July 2022