 While almost all phytoplankton species are obligate photoautotrophs, there are some that are mixotrophic and other, non-pigmented species that are actually heterotrophic (the latter are often viewed as zooplankton).Of these, the best known are dinoflagellate genera such as "Noctiluca" and "Dinophysis", that obtain organic carbon by ingesting other organisms or detrital material.Phytoplankton are crucially dependent on minerals.