California Department of Fish and Wildlife
Aquatic Biological Assement

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Corixidae Level 1 Level 2

Corixidae

 

Key Characters

Water boatmen; scavengers and predators, largest family of aquatic/semi-aquatic Heteroptera. Ventrally keeled, dorsally flattened, beak triangular, short, and unsegmented. Oar-like hind legs, front legs with single tarsal segment scooplike or fringed with stiff setae.

Tolerance 8-10
Distribution CA, OR, WA, NV, AZ, Baja