California Department of Fish and Wildlife
Aquatic Biological Assement

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Hydraenidae Level 1 Level 2





Key Characters (adult)

Minute moss beetles. Found at the water’s edge in both lentic and lotic habitats as well as intertidal. Adults are generally small, 0.5-3 mm; antennae with a 5-segmented club; maxillary palps may be as long as the antennae, or longer in Hydraena; pronotum may have clear border in other genera.

Key Characters (larva)

Larvae found in the soil at water’s edge. Abdomen 10-segmented; pair of recurved hooks may be present on 10th abdominal segment; urogomphi 2-segmented.

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