[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 Peritricha Stein, 1859
             1 Genus Vorticella Linnaeus, 1767
             2 Genus Peridinium Ehrenberg, 1830 see Genus Peridinium Ehrenb. (1830)
             3 Genus Codonella Haeckel, 1873