The ancestral green alga was a unicellular flagellate. Kinetoplastids refer to a group of flagellate protozoa. Their dominant life cycle stage is as an amoeboid flagellate. "Euglena gracilis" is a motile, freshwater, photosynthetic flagellate. It can be seen in either an amoeboid or temporary flagellate stage. The Apusozoa are an Obazoa phylum comprising several genera of flagellate eukaryotes. A flagellate can have one or several flagella. "Naegleria", in contrast to other amoebae, differentiates within two hours into the flagellate state. Euglena is a genus of single cell flagellate eukaryotes. The terminal ends of crustacean antennae have two major categorizations&colon; segmented and flagellate. Thus, it is an amoeba of flagellate ancestry. "P. caudatum" feed on bacteria and small eukaryotic cells, such as yeast and flagellate algae. The flagellate is pear-shaped and biflagellate&colon; this means that it has two flagella. Monocercomonoides is a genus of flagellate Excavata belonging to the order Oxymonadida. Cavalier-Smith created the phylum Percolozoa for the extended group, together with the enigmatic flagellate "Stephanopogon".