Kingdom Protista includes all the unicellular eukaryotes. They are predominantly aquatic organisms with most of them being marine. They include both autotrophs as well as heterotrophs. Gonyaulax, Euglena, Amoeba and Pinnularia all belong to the kingdom Protista, all are unicellular and eukaryotic organisms. Holozoic nutrition is seen in Amoeba and Euglena. All the mentioned organisms except Amoeba are said to be photosynthetic, so their mode of nutrition is autotrophic.