Cyclotella stelligera is a freshwater diatom characterized by its disc-shaped or cylindrical cell structure. It exhibits fine striation patterns, typically with 7–9 striae per 10 μm, varying in length and arrangement. The striation pattern includes a complex alveolar structure with alternating rows of 3–7 thin costae between thicker ribs. Commonly found in freshwater habitats, Cyclotella stelligera contributes to the phytoplankton community, playing an essential role in aquatic ecosystems.