Volvox (single-celled, but colonial)

Volvox

Volvox

It Colonies up to 1 mm

They are Planktonic in still and flowing waters.

Volvox is a spherical colony of hundreds of green algal cells each with two whip-like flagella. These cells are distributed on the surface of a hollow jelly-like globe. Sometimes the colony may contain smaller colonies. Volvox has features of both algae and protozoa, and is classified by some authorities as a green algae (Chlorophyta) and by others in the protozoan order Volvocida.

Classification :Kingdom - Protoctista, Phylum - Chlorophyta