Protozoans are the primitive eukaryotes which are unicellular in nature. Amoeboid, flagellates, ciliates, sporozoans are the different classes under protozoans.Chlamydomonas is a genus of green algae.
Diatoms and Desmids are Chrysophyta members, are plant-like protists. Amoeba, Paramoecium, Trypanosoma, Plasmodium are protozoa or animal-like protists.