Frustules biraphid, circular to elliptical in outline, cells bent so as to be saddle-shaped. May appear narrowly D-shaped, depending on the lie of the valve. Raphe elevated above margin in a wing supported by ribs which are arranged radially. Multiseriate striae alternate with ribs, puncta not resolved.
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.