The eastern dobsonfly, Corydalus cornutus, is a large insect in the Corydalidae family. There is one species of threatened dobsonfly in Michigan and no species of threatened fishflies. The origin of the word "dobsonfly" is unclear. Nevromus austroindicus is a species of dobsonfly found in the Western Ghats of India. The eastern dobsonfly, "Corydalus cornutus", is the most well-known North American species among the dobsonflies. The dobsonfly is found in most of eastern North America. Dobsonfly larvae, commonly called hellgrammites, are often used for angling bait in North America.