Noun | 1. | Dinoflagellata - in some classifications considered a phylum of the kingdom Protista; in others included in the plant phylum Pyrrophyta animal order - the order of animals dinoflagellate - chiefly marine protozoa having two flagella; a chief constituent of plankton genus Noctiluca - a genus of protoctist family Peridiniidae, Peridiniidae - marine and freshwater dinoflagellates |