Volvox are multicellular, colonial green algae. Each cell in the colony has two flagella extending outward that propel the volvox through its environment. The cells of the volvox are functionally differentiated. Volvox are considered one of the most structurally advanced forms of algae.
Desmids are single-celled green algae found in freshwater.
They are symmetrical and can reach 0.4millimeters across. The body of a desmid is either circular, rotund, elongated, or moon shaped. Desmids also often look like they have arms of spines protruding from the cell. The chloroplasts of spirogyra are spiraled. Zygnema are singled-celled, filamentous green algae as well.