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Phylum Arthropoda
Class Insecta
Order Ephemeroptera
Family Potamanthidae
Common Name Hacklegill Mayfly
Distinguishing Characteristics
  • Mandibular tusks present
  • Fore legs slender
  • Feathery gills are present on segments 1-7
  • Caudal filaments fringed with hairs
Additional Pictures

     Larvae and adult range from 8-15 mm in length and are found in moderate to fast flowing streams and rivers.

     The young larvae of Potamanthidae are burrowers in soft silt, but as the larvae mature they move to erosional habitats with cobble and gravel where they can be found on rocks. The Potamanthidae mayflies are closely related to other burrowing mayflies, but their fore legs are not adapted for burrowing.

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Merritt, R W., K W. Cummins, and M B. Berg. An Introduction to the Aquatic Insects of North America. Dubuque, Iowa: Kendall/Hunt Company, 2008.