Green algae - Eudorina
Eudorina has globose colonies and each cell has two flagella. The cell has a bright red body called eyespot, which are involved with the perception of and reaction to light. The whole colony rotates. Eudorina has great similarities with Pandorina
The cell diameter is about 12-24 my and the whole colony can be 200 my.
The picture shows Eudorina elegans.