Valves discoid, the face flat or undulate with two patterns of ornamentation between the periphery and center of the valve. Ornamentation pattern towards the periphery with striae that continue onto the mantle. Ornamentation pattern near the valve center with strutted processes only or with warts, globulesm and/or depressions or elevations. Spines usually lacking.
Light Microscope Image(s)
Each image is accompanied by the genus and species, California Academy of Sciences slide number (ie. CAS 612010), location of the specimen on the slide, and dimension in microns.