California Department of Fish and Wildlife
Aquatic Biological Assement

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Microsporidae Level 1 Level 2

Microsporidae (Sphaeriusidae)




Key Characters (adult)

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.

Key Characters (larva)

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.

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