living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
Count: 4k;54p;156c;911o;7123f;17,575g;4762s;36ss;8v;19; ‡1f;6g;7s;1ss; †1c;10o;10f;19g;1s
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
  Count: [c] 2k;51p;154c;900o;7001f;17,209g;4300s;33ss;8v; ‡1f;6g;7s;1ss; †1c;10o;10f;19g;1s
     Kingdom Animalia Linnaeus, 1758 - animals
    Count: [c] 38p;101c;595o;5766f;13,419g;3233s;32ss;3v; ‡1f;6g;7s;1ss; †1c;9o;10f;16g;1s
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
      Count: [c] 29p;70c;458o;5094f;11,476g;2933s;31ss;3v; ‡1f;6g;7s;1ss; †1c;8o;10f;11g;1s
         Phylum Mollusca Linnaeus, 1758 - molluscs
        Count: [f] 8c;42o;538f;1769g;163s; †2f;1g
           Class Gastropoda Cuvier, 1795 - snails and slugs
          Count: [f] 16o;332f;1050g;85s
             Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
            Count: [f] 9o;109f;350g;36s
               Order Nudibranchia Cuvier, 1814 - "true" nudibranchs
              Count: 61f;211g;18s
                 Suborder Arminoidea Iredale & O'Donoghue, 1923 (1841) see Suborder Arminina Odhner, 1934
                Count: [g] 9f;19g;4s
                   Superfamily Euarminiacea
                  Count: [g] 3f;8g;1s
                     Family Heterodorididae Verrill & Emerton, 1882 see Family Arminidae Iredale & O'Donoghue, 1923 (1841)
                    Count: [g] 2g;1s
                       Genus Arctoleura Odhner, 1968, nom. nud.
                      Count: -
                       Genus Heterodoris Verrill & Emerton, 1882
                      Count: 1s