The family Corydalidae contains the megalopterous insects known as dobsonflies and fishflies. Megaloptera includes dobsonflies, alderflies and relatives. There are about sixty species of dobsonflies. It contains the alderflies, dobsonflies and fishflies, and there are about 300 known species. The nine genera of dobsonflies are distributed in the Americas, Asia, and South Africa. Dobsonflies are a subfamily of insects, Corydalinae, part of the Megalopteran family Corydalidae.