California Department of Fish and Wildlife
Aquatic Biological Assement

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Rossianidae Level 1 Level 2



Key Characters

Coarse surfacing of head and pronotum. Abdomen with single gills; chloride epithelia absent. 2 or 3 mesonotal sclerites on either side of midline. Toothed mandibles with mesal tuft of setae. Cases almost always made of rock fragments. Rossiana montana only species in CA.

Tolerance unknown
Distribution WA