In association with Acadia Learning we present this dichotomous key that will help you identify larval dragonflies (Order: Odonata, Suborder: Anisoptera) of the northeastern U.S. to the family level. There are seven families in the Northeast (but one is quite rare).

This site includes:

• The key itself, which guides you through identification of a dragonfly larva (or nymph) using questions and photos. The key begins with a quick check of other aquatic invertebrates, to make sure you’re on the right track with your specimen.


• A diagram so that you can identify the various parts of the larval dragonfly’s anatomy. You can refer to it while you are using the key, without losing your place.


• A glossary that lists terms that are underlined throughout these pages. Click any underlined word to see its definition.


• If you wish to identify your specimen further – to genus or species – or to find other resources about dragonflies, see our Links page.