California Department of Fish and Wildlife
Aquatic Biological Assement

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Microsporidae Level 1 Level 2

Microsporidae (Sphaeriusidae)

Adults:

Larvae:

 

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