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Epiaeschna heros

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description Epiaeschna heros Overview

Epiaeschna heros, commonly known as the swamp darner, is a large dragonfly native to the eastern United States and southeastern Canada. First described by Fabricius in 1798, it ranks among the largest dragonfly species in North America, typically reaching a body length of approximately 90 millimeters. This species inhabits wooded swamps, marshes, and temporary pools where its aquatic nymphs develop before emerging as adults in late spring and early summer.

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How big does the swamp darner (Epiaeschna heros) get?

The swamp darner is one of the largest dragonfly species in North America, reaching a body length of approximately 85 to 90 millimeters (around 3.5 inches) with a wingspan that can exceed 5 inches. Its large size and distinctive brown-and-green coloration make it easily identifiable in the field.

What type of habitat does the swamp darner prefer?

Epiaeschna heros is typically found in shaded swampy woodlands, forested streams, and seepage areas across the eastern United States and southeastern Canada. Unlike many dragonfly species that prefer open sunny ponds, the swamp darner is strongly associated with shaded woodland environments.

When was Epiaeschna heros first scientifically described?

The species was first described by the Danish entomologist Johan Christian Fabricius in 1798. Fabricius was one of the most prolific entomologists of the 18th century and described thousands of insect species during his career.

Does the swamp darner migrate?

Yes, the swamp darner is known to exhibit migratory behavior, with large swarms observed moving southward along the Atlantic coast during late summer and fall. These movements are less well-documented than those of the common green darner (Anax junius), but mass flights involving hundreds of individuals have been reported.

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