California Department of Fish and Wildlife
Aquatic Biological Assement

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Caenidae Level 1 Level 2

Caenidae

 

Key Characters

Quadrate operculate gills on segments 2 not fused medially, gills on segments 3-6 with fringed margins. Mesonotum unlike Neoephemeridae. Hind wing pads absent.
Tolerance 7
Distribution CA, OR, WA, AZ, Baja