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 Systellommatophora Pilsbry, 1948 see Suborder Systellommatophora Pilsbry, 1948
                 Superfamily Oncidiacea see Superfamily Onchidiacea
                   Family Oncidiidae see Family Onchidiidae Rafinesque, 1815
                     Genus Onchidella Gray, 1850