THE XERCES SOCIETY FOR INVERTEBRATE CONSERVATION

Aquatic Invertebrates in Pacific Northwest Freshwater Wetlands
An Identification Guide and Educational Resource

Corixidae
(water boatmen)

streamlined boat-shaped bodies; oarlike legs with long swimming hairs; short, thick, traingular beak; short scoop-shaped forelegs

Notonectidae
(backswimmers)

body slighly convex, may be patterned; narow tube-like beak; forelegs not scoop-shaped as above