The Perlidae family are large, robust stoneflies. Yellow to brown coloration. 3/8-1 5/8” length. Conspicuous ventral branched gills present on the thorax.
Wide range of lotic habitats. Also found in some erosional lentic environments. Typically found under stones. Like many stoneflies, Perlidae are sensitive to environmental disturbances and pollution.
Approximately 82 species are found throughout North America, 400 species worldwide. The majority of North American species are found east of the Rocky Mountains.
1-2 year life cycle. Eggs laid in the water, and may go into diapause during warmer summer months. Adults emerge in spring-summer.
Nymphs are carnivorous, however, some early instars may be collector/gatherers. Eat a variety of aquatic invertebrates including mayfly nymphs, midges and caddisfly nymphs.