Phylum Chlorophyta The Green

Volvox is a genus of chlorophytes, a type of green algae. It forms spherical colonies of up to 50,000 cells. They live in a variety of freshwater habitats, and were first reported by Antonie van Leeuwenhoek in 1700. Volvox developed its colonial lifestyle 200 million years ago.
Ancestors of Volvox transitioned from single cells to form multicellular colonies at least 200 million years ago, during the Triassic period. An estimate using DNA sequences from about 45 different species of Volvox and related species suggests that the transition from single cells to undifferentiated multicellular colonies took about 35 million years.
Volvox aureus

Phylum Chlorophyta The Green	Phylum CHLOROPHYTA	Phylum Rhodophyta	Phylum Euglenophyta	Phylum Chlorophyta consists of
Chrysophyta	algae phylum Chlorophyta	Phylum CHLOROPHYTA	phylum Chrysophyta	Phylum Chlorophyta