Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925 Opisthokonta Cavalier-Smith, 1987 - opisthokonts see Clade Opisthokonta Cavalier-Smith 1987, nom. cl. inval. Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758 Eumetazoa Bütschli, 1910 - eumetazoans Phylum Cnidaria Hatschek, 1888 - cnidarians Class Anthozoa Ehrenberg, 1831 Subclass Zoantharia de Blainville, 1830 Order Actiniaria - sea anemones