The world in a drop

Aquatic protozoan

Aquatic protozoan

Paramecium

Paramecium

Ciliated protozoan Ciliophora

Ciliated protozoan Ciliophora

Stentor

Stentor

Vorticella

Vorticella

Paramecium caudatum

Paramecium caudatum

Unicellular alga

Unicellular alga

Unicellular algae

Unicellular algae

Trypanosoma brucei

Trypanosoma brucei

Protista live anywhere, provided there is even a little amount of water. There are marine and freshwater species that live both floating on the water or on the seabed. A small water pond is enough for these micro-organisms to live; they can usually be found even in the thin film of water that covers the soil particles.