living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Rotifera Cuvier, 1798 - rotifers see Phylum Syndermata Ahlrichs, 1995
           Class Monogononta Plate, 1889
             Order Collothecaceae see Order Collothecacea
               Family Collothecidae Bartos, 1959
                 1 Genus Collotheca Harring, 1913
                 2 Genus Stephanoceros Ehrenberg, 1832
                 3 Genus Acyclus Leidy, 1882
                 4 Genus Cupelopagis Forbes, 1882
                 5 Genus Atrochus Wierzejski, 1893