Rhopalodia O. Muller
Frustules biraphid, asymmetrical to apical axis (some species extremely so), symmetrical to transapical axis. Dorsal margin notched in some species. Canal raphe positioned along dorsal margin, may be raised in a keel. Transapical costae robust, with 2-several rows of puncta occurring between consecutive costae.
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.