The following images of the specimens depict different focal planes. Although this taxon is very distinctive there has been considerable taxonomic confusion associated with it. The multiseriate fascicles and the wide interfascicles should distinguish it from other taxa. Areolae vary in placement and size giving a range of 14-20 in 10 micrometers. Fascicles and spines are 3-5 in 10 micrometers at the margin.
Spines are robust usually with a spine near the margin of each interfascicle.
The attachment of the spine is away from the margin. The valve is concentrically undulate with both concave and convex valves known. Gaul et al. The specimen illustrated in Thayer et al. The image is used with the permission of BioPress, publisher of Diatom Research.