The secret has been revealed! My moth eclosed on July 21, completing its life cycle. I released it the day it emerged, after I finished snapping off many photos of it (and before I’d gotten it identified).

The moth I reared from older caterpillar to adult was…

A Mouse Moth (Amphipyra tragopoginis)!

Possibly introduced from Europe (oops), these moths eat a variety of plants as caterpillars (mine just wanted dandelions, and lots of them). They can be identified by the triangle of black spots on each forewing.

According to ukmoths.org.uk, they may be called Mouse Moths because, when startled, they tend to run away like little mice instead of flying. That would fit with my experience while trying to re-catch it after I accidentally let it escape during its photo shoot.

All in all, raising that little caterpillar was a fun experience! And now I have a souvenir pupa skin to remember it by!