Volvox is one of the best-known chlorophytes and is the most developed in a series of genera that form spherical colonies.
The cells swim in a coordinated fashion, with a distinct anterior and posterior – or since Volvox resembles a little planet, a 'north' pole and a 'south' pole. The cells have eyespots, more developed near the anterior, which enable the colony to swim towards light.
Volvox is found in ponds and ditches, and even in shallow puddles.
