metazoans Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758 [stem] Phylum †Procoelomata Bergström, 1989 Class †Machaeridia Withers, 1926 Order †Hercolepadida Dzik, 1986 [monotypic] see Order Multiplacophora Hoare & Mapes, 1995 Family †Hercolepadidae Dzik, 1986