Hello!
I grew couple of Arctia caja (yellow ssp, not sure which one, maybe wiscotti) caterpillars at this autumn, most of them decided to overwinter as they should, but couple grew to L5 and pupated (they were not very large if that's important).
One moth emerged ok with only hind wings a bit crumpled, but second one is very crippled.
I wanted to ask, what is that yellow thing (I am not good in moth anatomy, unfortunately) visible? is it coremata, one of its internal organs prolapsed, or it is some sort of mutation? moth was unable to spread its wings - they remained same size as when it has emerged from pupae. pupae itself took about a month to hatch
sorry for bad quality pictures, I don't have a good camera.
I tried to google but didn't found anything about that