According to blaadmineerders.nl P xenia feeds on Aspen

Could these mines not be microtheriella? Looks like the correct shape, and there's multiple mines on the same leaf, which is common for microtheriella

Can't be taken beyond genus but most likely to be cagnagella with those white terminal cilia

In this Perspective, students from the 2024 Embryology Course share their experiences spending the summer at the Marine Biological Laboratory (@mblscience.bsky.social‬) in Woods Hole:
journals.biologists.com/dev/article/...

I assume you reared them from larvae? What did you feed them - are you close enough to Bearberry to feed them that, or did you try them on Willow?

Not argyrana IMO, suspect one of albuginana/suspectana, worth dissecting

How'd you find this one? On a fencepost?

Thank you!