Minute bog beetles.Adults occur in wet sand, gravel or in leaf litter at the stream margin. Body size small, 1.5 mm or less, broadly oval and convex; hind coxal plates large, covering first two abdominal sternites, but exposing abdominal segments laterally; bases of hind femora also exposed.

Larvae occur with adults. Larvae are 0.8 to 1.2 mm long; the body is slightly flattened and narrowed posteriorly; have 4 stemmata on each side; the antennae are short and 3-segmented, but may appear to be only 2-segmented; unique in having paired, fingerlike lobes on abdominal segments 1-8.