Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Protozoa Goldfuss, 1818 see Kingdom Protozoa Goldfuss, 1818
     Class Flagellata see Subphylum Mastigophora Diesing, 1866
       Order Opalinina see Order Opalinida Poche, 1913
         Genus [Opalina] Purkinje & Valentin, 1835
           1 Opalina ranarum Dujardin, 1841
           2 Opalina dimidiata