Meconium is a metabolic waste product from the pupal stage that is expelled through the anal opening of the adult butterfly. Metalmarks are butterflies that belong to the family Riodinidae. Metalmarks have long antennae. The forelegs are normal in females, but reduced in the males. Most metalmarks have some type of relationship with ants.
Caterpillars are slug-like, short, and often have tubercles with bristles.
The micropyle is the large depression at the top of a butterfly's egg. This small pit marks where the sperm entered the egg. While the egg is developing, air and water enter the egg through the micropyle. Many butterflies migrate in order to avoid cold weather. Butterfly migration is not well understood.