Title says all. Like with white lion and white tiger, caterpillar isn't a species but rather a form of an animal, in this case a juvenile form. Specifically, it's comparable to how the tadpole is to amphibians or larva to other insects (not to mention both larva and tadpole are general tags themselves)

Caterpillar are a type of larval stage actually, so imho it should also imply larva to begin with. (vaguely relevant but since I'm here: tadpole should imply amphibian)