Anisozygoptera is the smallest of the three families of dragonflies, comprising insects which are superficially similar to the Anisoptera, but whose wings have narrow bases (a feature of Zygoptera). The larvae also show features possessed by both the other families. The Anisozygoptera flourished during the Mesozoic, when they replaced the ancestral dragonfly order Protanisoptera. Today there are only two, poorly known, living species, found in India and Japan.