Euglenozoa are a small group of unicellular algae not closely related to the plants. Red algae, the Rhodophytes , typically live deep under the ocean surface, and thus have a different array of photosynthetic pigments, resulting in their red color. The Cryptomonads are considered both algae and protozoans, and contain several rare photosynthetic pigments. The Dinozoa comprise the dinoflagellates, unicellular algae that move with two oppositely situated flagella to produce the whirling motion they are known for. The Apicomplexans are parasitic protozoans, with specialized organelle complexes, designed to penetrate host cells and tissue, at the apex of the cell.
Microsporidians are a group of small parasitic protozoans, one of the oldest protozoan groups known.
Myxozoa are a group of parasitic protozoans found mainly in cold-blooded vertebrates such as fish. Arasiomycota are the cellular slime molds, with a predominantly amoeboid unicellular stage, while Myxomycota are the plasmodial slime molds, with a unicellular stage, the plasmodium, of vast, streaming cytoplasm with many nuclei. To see how the protists gave rise to the three other eukaryotic kingdoms, click here .