Storage polysaccharide as starch. Cellulose plates reinforce cell surface. Flagella beat perpendicular to each other causing spinning motion. Some species are capable of producing their own light through bioluminescence . There are about 4,000 known species, but this is probably a very low estimation.
Sporozoites are infectious cells of organism and are able to penetrate host cells and tissues.
Complex life cycle often involves more than one host. Are parasites of animals. Species in the genus Plasmodium cause malaria in humans and other animals an estimated 300 million people in over 90 countries are infected with malaria, and over 1 million die from it each year. Have been used experimentally to control populations of insect pests. Use cilia for locomotion and to draw water in for feeding.