A unicellular, marine diatom, belonging to the Heterokonta (Superphylum), Coscinodiscophyceae (Class), Thalassiosirales (Order), Thalassiosiraceae (Family). Cell size ranges from 5 to 20 µm.This microalgae is rich in ω-3 fatty acids and pigments like Fucoxanthin, Peridinin, Chlorophyll c, and Chlorophyll a, as well as Diadinoxanthin.