This webpage was created to introduce the protozoans encountered in wastewater such as flagellates, ciliates, and amoebas.  The basic definition of a protozoan is, in simple terms, more complex than a single celled bacterium, but not complex enough as a metazoan.  Protozoans are single celled Eukaryotic organisms that are classified by their means of locomotion whether it be via a flagella or cilia.  So you ask, how does an amoeba get to be a protozoan when by looking at it moves by pseudopods.  Well, there are some species of amoebas that have a flagellated stage.  As a matter of fact, amoebas where classified into the Sarcomastigophora Phylum.

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