Geometrid moth caterpillar (Geometridae) from Monteverde, Costa Rica.
Shore fly maggot, Ephydridae (Iowa). I found this almost-microscopic larva swimming near the surface of an algae-covered pond. The breathing tubes on the posterior end (called spiracles) function like tiny snorkels, allowing the larvae to breathe underwater.
Colorado Potato Beetle larva, Leptinotarsa decemlineata, from Roseville, Minnesota.
