Types of phytoplankton - Coccolithophores

-Belong to prymnesiophytes. -Unicellular and are important in the biogeiochemical cycle of C,S. -Have hard outer layer called cocoliths. -Increase of coccolithophorids, increase in CO2, positive feedback of CO2 in the atmosphere. -Widespread distribution: Emiliana Haxleyi is most common and cause albedo on surface from reflective of light by large blooms, It also synthesises DMSP as an omsolyte, the precursor of DMS