Tetradesmus dimorphus
Tetradesmus dimorphus is a freshwater unicellular green algae in the class Chlorophyceae. The name means "having two forms".
Tetradesmus dimorphus consists of colonies of two, four or eight cells, which are arranged linearly or in a zigzag fashion, in one or two rows. Cells are 6–25 μm long and 2–9.4 μm wide, broadly spindle-shaped, tapered to points at both ends. The inner cells are straight, while marginal cells have ends that are slightly curved outwards.