Individual cells within a colony are connected at their tips, forming star-shaped or zigzag configurations. Both shapes can coexist within the same colony. When viewed from the side, the cells have nearly parallel sides. The valves are isopolar, meaning they have blunt and rounded ends. A key distinguishing characteristic is the marginal areolae, which open into depressions on the valve’s surface and mantle. When observed through scanning electron microscopy (SEM), three-pronged struts are apparent on top of the areolae externally. In between the rows of areolae, there is a non-perforated axial area. Each cell has one labiate process, visible from the cell’s interior, situated at each end. Externally, this labiate process appears as a circular hole on the valve’s surface.