Red tide is caused by this group of algae. Euglenoids are a small phylum of freshwater unicellular algae. Like the green algae, euglenoids have chloroplasts. A cell wall made of protein makes these algae distinctive. Euglenoids also have two flagella making them mobile .
Amoebas can live in freshwater, marine, and terrestrial habitats.
Pseudopods, false feet, are one characteristic that distinguishes amoebas from other protozoans. Amoebas also lack a cell wall and flagella. They engulf food particles forming food vacuoles. Like the amoebas, they also have pseudopods. Zoomastigotes are protozoans that are unicellular, heterotrophic, and have at least one flagellum.