[Kingdom] Animalia Linnaeus, 1758 - animals Grade Plastidozoa [monotypic] [Phylum] Protozoa (Goldfuss, 1818) C.T. von Siebold, 1854 see Kingdom Protozoa Goldfuss, 1818 Grade Stomatodea Class Ciliata see [unranked] ciliates Order Heterotricha Stein, 1859 see Suborder Heterotricha Stein, 1859 Genus Stentor Oken, 1815