[Kingdom] Animalia Linnaeus, 1758 - animals Grade Plastidozoa [monotypic] [Phylum] Protozoa (Goldfuss, 1818) C.T. von Siebold, 1854 see Kingdom Protozoa Goldfuss, 1818 Grade Corticata Lankester, 1877 Class Corticata Lankester, 1877 [monotypic] Order Gregarinidæ Genus Gregarina Dufour, 1828