Frustules biraphid, with one or more longitudinal lines (formed by internal canals) on both sides of the axial area. Striae are distinctly punctate. Proximal raphe ends are commonly recurved in opposite directions or terminate as straight ends. Distal raphe ends appear to bifurcate. Discontinuities (called Voigt Faults) in the striae are common in this genus, being found on one side of the axial area along each raphe branch.
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.