Motile, heterotrophic and eukaryotic unicellular protists, such as amoebas, trypanosomes, sporozoans, and paramecia that are represented in almost every kind of habitat, including some pathogenic parasites of humans and domestic animals.

Articles on that refer to Protozoan

Chapter 3: Organism and Machine By Michael Denton
Consciousness Connects Our Brains to the Fundamental Level of the Universe By Stuart Hameroff

Related Links

Protozoan -