Circular valves with elongate mantles, not distinctly perforated. Valves joined to form cylindrical filaments by mucilage secreted from valve center. Elongate spines lacking. Cells more commonly occur in girdle view.
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.