Kingdom Animalia Linnaeus, 1758 - animals Phylum Mollusca Linnaeus, 1758 - molluscs Subphylum Cyrtosoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758 Class Monoplacophora Odhner, 1940 - monoplacophorans Order †Cyrtonellida Horny, 1963 Genus †Yochelcionella Runnegar & Pojeta, 1974 †Yochelcionella ostentata Runnegar & Jell, 1976