Paramecium

Paramecium is one of the best-known protists, often taught in school biology courses. It is a Ciliate genus. Ciliates are a clade of protists which move by synchronous waves of tiny projections from their cuticle. These projections are called cilia (singular: cilium).^[1][2] The species range from 50 to 350 μm in length.^[3] They live in freshwater ponds, and eat bacteria, and other protists such as single-celled algae.

Paramecium species usually have bacterial symbionts, and some species have green algal symbionts.

1. ↑ Paramacium
2. ↑ 101 Science.com: Paramecium caudatum
3. ↑ A μm is a millioneth of a metre.