Protozoa Goldfuss, 1818 - protozoans Phylum Sarcomastigophora Honigberg & Balamuth, 1963 Subphylum Mastigophora Diesing, 1866 - flagellates Class Phytomastigophorea Calkins, 1909 - photosynthetic flagellates Order Prymnesiida Cavalier-Smith see Phylum Haptophyta D.J. Hibberd ex Edvardsen & Eikrem (2000)