Megaloptera

Corydalus cornutus: Eastern Dobsonfly - Photographs of the different life stages of this large insect whose aquatic larvae are known as hellgrammites, its distribution, description, life cycle and biology.
creatures.ifas.ufl.edu/misc/eastern_dobsonfly.htm

Megaloptera - Account from the Tree of Life of the Megaloptera (alderflies, dobsonflies, fishflies), formerly considered a suborder (Sialodea) of Neuroptera, generally considered to be among the most primitive of the holometabolous insect orders.
tolweb.org/tree?group=Megaloptera&contgroup=Endopterygota

Megaloptera: Dobsonflies and Alderflies - The characteristics of these insects, their life cycle, feeding and habitat, with illustrations.
www.ento.csiro.au/education/insects/megaloptera.html