Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Protozoa Goldfuss, 1818 see Kingdom Protozoa Goldfuss, 1818
     Class Ciliata see [unranked] ciliates
       Order Peritricha Stein, 1859
         Suborder Sessilia Kahl, 1933
           1 Genus [Vorticella] Linnaeus, 1767
           2 Genus Epistylis Ehrenberg, 1830
           3 Genus Opercularia Goldfuss, 1820
           4 Genus Zoothamnium Bory de St. Vincent, 1826
           5 Genus [Ophrydium] Bory de St. Vincent, 1827
           6 Genus Carchesium Ehrenberg, 1832[1830]