Biraphid valves that are linear to lanceolate and may be rostrate or capitate. A distinct plastid is large and divided into two X-shaped plates that are apprised against each valve. Striae are uniserate and composed of circular puncta that are occluded internally. Primarily a freshwater genus. This taxon includes the former Navicula gastrum.
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.