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Phylum Arthropoda
Class Insecta
Order Ephemeroptera
Family Ephemerellidae
Common Name Spiny Crawler Mayflies
Distinguishing Characteristics
  • Gills absent from abdominal segment 2
Additional Pictures
     Larvae and adults rand from 4-15 mm in length and can be found in a variety of habitats. Their preferred habitat is in flowing waters of streams and rivers, collecting/gathering food.

     When threatened, spiny crawler mayflies have an interesting habit of raising their three tails up, presumable to appear larger. If this posture does not frighten the intruder, they mayfly will curl its abdomen over its body so that their tails project in front of the head. The tails will then be used to jab the attacker.

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Additional Links



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.