Platydorina

Platydorina is a genus of microscopic green algae in the family Volvocaceae. It contains only one species, Platydorina caudata. It was described by Charles Atwood Kofoid in 1899.

==Description== Platydorina caudata consists of a flattened, horseshoe-shaped coenobium containing 16 or 32 cells embedded in a transparent, gelatinous matrix. Cells have two flagella that protrude out of the matrix. Each cell is uniformly sized and colored green from a single cup-shaped chloroplast containing a pyrenoid, with a circular red eyespot and two contractile vacuoles. At one end the matrix is rounded, while at the other end it is drawn out into a few rounded "tails".