They are abundant in freshwaters Pyrrophytes Pyrrophytes or Dinophytes have a typical plant-like cell wall and chloroplasts containing chlorophyll. They have two flagellae, one large for propulsion and the other small which makes them twist as they move. Chrysophytes Chrysophytes include the 'Golden Brown' Algae and the Diatoms. The colour is due to abundant carotenoids as well as chlorophyll pigments. They do not have a cellulose cell wall and the Diatoms have a cell wall made of Silica.
Diatoms are the main primary producers in the oceans and are also very common in freshwaters.
The Gymnomycota are commonly called 'Slime Moulds'. At some stage in their life-cycles, they exist as single cells. At the reproductive stage, these gather into a large, slimy mass, hence the name. Slime moulds are common inhabitants of the soil and other terrestrial environments rich in decomposing matter. Zoomastigophora Zoomastigiphorans are the true animal flagellates.