Members of the kingdom Protista are a highly varied group of
organisms, all of which are eukaryotic. In addition, protists
are unicellular or, in some cases, colonial. Many species are
autotrophs, creating their own food, while others are
heterotrophs, feeding on organic matter. Many species are
nonmotile, but the majority of protists are able to move by
various means. Many protists have contractile vacuoles, which
help them to remove excessive amounts of water from their
cytoplasm. The kingdom Protista includes the protozoa, the slime
molds, and the simple algae.  The protozoa are subdivided into
four phyla depending on their method of locomotion:
Mastigophora, Sarcodina, Ciliophora, and Sporozoa.   Members of
the phylum Mastigophora move about by using one or more whiplike
flagella. The genus Euglena contains flagellated species.
Members are freshwater protists with typical eukaryotic
properties, including two flagella, reproduction by mitosis, and
flexible nutritional requirements. Euglena species also pos