Opisthokonta Cavalier-Smith 1987, nom. cl. inval. see Clade Opisthokonta Cavalier-Smith 1987 [Simpson & Medina 2020] Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758 1 Porifera Grant, 1836 - sponges 2 Epitheliozoa Ax, 1996