Dobsonfly
Dobsonflies are large aquatic insects in the subfamily Corydalinae, order Megaloptera, known for the males’ enlarged mandibles and the aquatic larvae called hellgrammites.
Dobsonflies are large aquatic insects in the subfamily Corydalinae, order Megaloptera, known for the males’ enlarged mandibles and the aquatic larvae called hellgrammites. They are found near moving water and are best known in North America for the eastern dobsonfly, Corydalus cornutus.
Classification
Dobsonflies belong to the order Megaloptera and the family Corydalidae. Sources describe them as a group within the subfamily Corydalinae, with several genera and dozens of species worldwide.
Life cycle and habitat
Dobsonflies spend most of their lives as aquatic larvae in flowing freshwater habitats such as streams and rivers. Adults are short-lived, usually emerging in late spring or summer and living only a few days.
Appearance and behaviour
Adults are large insects with four similarly sized, net-veined wings and long antennae. Males are especially notable for their enlarged jaws, which are used mainly for display and mating rather than defense.
Larvae and ecological role
The larvae, known as hellgrammites, are predatory aquatic insects and are commonly used by anglers as bait. They contribute to stream ecosystems as mid-level predators.
Key facts
- Dobsonflies are large, net-veined insects in the subfamily Corydalinae.
- Adults are usually nocturnal and are often attracted to lights.
- Males have very large mandibles used mainly in courtship, while females have shorter, stronger mandibles that can deliver a painful bite.
- The aquatic larvae are called hellgrammites and live in streams and rivers.
- Dobsonflies are associated with clean, moving water and are important predators in aquatic food webs.
Dobsonflies occur in eastern North America and are reported from Canada, where they are associated with rivers and streams and may be encountered by anglers and naturalists.
Frequently asked questions
What is a dobsonfly?
Are dobsonflies dangerous to humans?
Where do dobsonflies live?
What do dobsonfly larvae look like?
How long do adult dobsonflies live?
What is the eastern dobsonfly?
References
- University of Maine Cooperative Extension — https://extension.umaine.edu/home-and-garden-ipm/fact-sheets/common-name-listing/dobsonflies/Supports: Adult and larval description, behavior, mandibles, habitat, and larval name hellgrammite.
- Encyclopaedia Britannica — https://www.britannica.com/animal/dobsonflySupports: Taxonomic placement, distribution, number of genera, and general characteristics.
- WebMD — https://www.webmd.com/a-to-z-guides/what-to-know-about-dobsonfliesSupports: Size, lifespan, habitat, distribution, and general biology.
- Missouri Department of Conservation — https://www.mdc.mo.gov/discover-nature/field-guide/eastern-dobsonflySupports: Eastern dobsonfly as the only species in eastern North America.