Caterpillar : Butterfly :: Maggot : ? Which word completes the analogy?

The relation is the soft crawling young stage : the winged adult it turns into. A caterpillar becomes a butterfly; a maggot, that legless white grub found in decaying matter, is the young of the housefly. The distractors all pass through a young stage of their own, which is the trap, but none of those stages is a maggot — the mosquito's young is a wriggler that hangs in still water, the beetle's is a hard-headed grub and the bee's is a pale larva fed inside its cell.