California Department of Fish and Wildlife
Aquatic Biological Assement

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Dryopidae Level 1 Level 2





Key Characters (adult)

Long-toed water beetles. Adults found in streams, mainly in leaf packs or log jams. Elongate, oval; ranging in size from 4-8 mm; head usually retracted into pronotum; antennae short and usually retracted, 11-segmented but with 2nd segment ear-like and covering remaining segments, which are usually broader than long; 5 visible abdominal sternites.

Key Characters (larva)

Larvae are terrestrial; elongate, subcylindrical; 9 abdominal segments; pleural sclerites absent or not well developed; retractile gills absent; operculum present; legs 4- or 5-segmented.

Tolerance 5
Distribution CA, OR, WA, NV, AZ