Phylum Protozoa (Goldfuss, 1818) C.T. von Siebold, 1854 see Kingdom Protozoa Goldfuss, 1818 Class Mastigophora Diesing, 1866 see Subphylum Mastigophora Diesing, 1866 Order Choanoflagellata see Phylum Choanoflagellata Kent, 1880