living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Eukaryotae see Domain Eukaryota Chatton, 1925
     Animalia Linnaeus, 1758 - animals
       Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Mollusca Linnaeus, 1758 - molluscs
           Gastropoda Cuvier, 1795 - snails and slugs
             Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
               Runcinoidea Adams & Adams, 1854 see Suborder Cephalaspidea Fischer, 1883
                 Ildicidae Burn, 1963 see Family Runcinidae Adams & Adams, 1854
                   Ildica Bergh, 1889