(done-al-ee-ella), a solitary volvocid (flagellated green algal cell). Cell surrounded by a cellulosic wall, with two similar flagella emerging from near the apex. The photosynthetic pigments are located within a cup-shaped chloroplast which has a large pyrenoid with associated polysaccharide materials located posteriorly. The nucleus is located within the cup. From marine and usually hypersaline habitats, grown commercially because of the tendency to produce large quantities of beta carotene when intensely illuminated. Differential interference contrast.