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 Protozoa Goldfuss, 1818 see Kingdom Protozoa Goldfuss, 1818
         Phylum Sarcomastigophora Honigberg & Balamuth, 1963
           Subphylum Mastigophora Diesing, 1866 - flagellates
             Class Zoomastigophora see Class Zoomastigophorea
               Order Diplomonadida Wenyon, 1926 - diplomonads
                 Suborder Diplomonadina see Order Diplomonadida Wenyon, 1926
                   Family Hexamitidae Kent, 1881
                     Subfamily Giardiinae Kulda & Nohýnková, 1978 see Family Giardiidae Kulda & Nohýnková, 1978
                       Genus Giardia Künstler, 1882
                         1 Giardia muris
                         2 Giardia lamblia Kofoid & Christiansen, 1915 see Giardia intestinalis