12 July 2005
Museum of Zoology, University of Michigan, Ann Arbor
This is an adult male dobsonfly, (Corydalus cornutus) that was found near the Huron River, in or near Ann Arbor, Michigan. The very long mandibles, though fierce-looking, are used mainly during courtship and mating. Males of this species are not reported to feed in the adult stage.
Animal Diversity Web, University of Michigan Museum of Zoology (copyright holder)