California Department of Fish and Wildlife
Aquatic Biological Assement

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Amphizoidae Level 1 Level 2

Amphizoidae

Adults:

Larvae:

 

 

Key Characters (adult)

Trout stream beetles. Adults and larvae found along margins of cool to cold streams, usually in fast-moving portions and often associated with undercut banks or woody debris. Adults resemble carabids; notopleural suture present; first ventrite divided by hind coxae; antennae 11- segmented, filiform; pronotum narrower than elytra, weakly crenulate;

Key Characters (larva)

Larvae strongly flattened and well scleritized; tergites projecting laterally; 8 abdominal segments; urogomphi short, 1-segmented.

Tolerance 1
Distribution CA, OR, WA