Protozoans
Protozoans ("first animals") may resemble the single-celled, heterotrophic protistans that gave
rise to animals. All are predators or parasites. Asexual reproduction by fission or budding
dominates protozoan life cycles, but some can reproduce sexually. Many parasitic types form
resistant cysts. A few protozoans are famous for the diseases they cause in humans.
The major groups of protozoans are:
- Sarcodina - Amoeboid protozoans
- Ciliphora - Ciliated protozoans
- Mastigophora - Animal-like flagellates
- Apicomplexa - Parasitic heterotrophs such as the sporozoans
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