Escaping the pupal shell
Life is getting more exciting here in the Wagner lab – moths are emerging! Every year we raise hundreds and hundreds of caterpillars for various projects. I am only directly involved in rearing my own specimens, but we have an army of undergraduates who help Dave rear caterpillars for his books and research. We have a “rearing room” in the lab where they are kept as caterpillars during the summer, and as pupae during the winter. Lately we have been increasing the photoperiod, heat, and humidity in order to encourage the moths to emerge a bit early. We are going to kill them to become specimens, and it’s nice to get all the pinning done before the field collecting season starts.
Today some lab members alerted me to this moth, a cute fuzzy species in the genus Cucullia (family Noctuidae). It had created its pupal chamber directly against the bottom of the plastic container amidst some paper towel. We thought this would make it easier for it to emerge, but it couldn’t seem to figure out what to do.
Its head appeared to be stuck, and it could not manage to break apart any other section of the pupal shell. We were about to cut it open to help, when…
Hurray! It emerged! It had to do some interesting yoga moves to flip around, but it got out of there in the end. It then took a few minutes to inflate its wings with hemolymph, and after a short time started looking like a regular moth.
Usually moths emerge at night in order to fluff up their wings out of sight of birds… so we had never seen a dramatic emergence such as this. Maybe it just needed some encouragement.