When moths emerge from their pupal shell, their wings start out small and shriveled. Over time the wings expand and harden so the moth is able to fly.
Unfortunately, sometimes things go wrong, and the wings aren’t able to expand. We see this periodically here in the lab, and we’re not sure why. Yesterday this little fuzz ball, Proserpinus lucidus, emerged. Perhaps due to the fact that it was not actually due to emerge until spring, its wings never expanded.
For reference, here is a fully formed adult (from Moth Photographer’s Group)
If you have raised moths and/or butterflies before – have you had this experience before, and do you have a sense of why it may have happened? One of my hypotheses is that a moth may spend too much time in the pupal shell once fully formed, and the wings could become hardened before actually emerging. Or in the case of our moth, being kept in a cool room for overwintering, it may have simply been too cold.