Cyclotella comta is a freshwater diatom with a cylindrical or tubular cell shape and a polygonal central area. It features fine striation, typically 7–9 striae per 10 μm, which vary in length. The striation pattern includes a complex alveolar structure, with alternating rows of 3–7 thin costae between thicker ribs. This species is commonly found in freshwater habitats, contributing to the phytoplankton community.