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 Mollusca Linnaeus, 1758 - molluscs
           Class Gastropoda Cuvier, 1795 - snails and slugs
             Subclass Pulmonata Cuvier, 1814 - land snails and slugs see Order Pulmonata Cuvier, 1814
               Order Stylommatophora Schmidt, 1855 see Infraorder Stylommatophora Schmidt, 1855
                 Suborder Mesurethra
                   Superfamily Clausiliacea see Superfamily Clausilioidea Gray, 1855
                     1 Family Clausiliidae Gray, 1855
                     2 Family Ceriidae Pilsbry, 1901 see Family Cerionidae Pilsbry, 1901
                     3 Family Megaspiridae Pilsbry, 1904