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 Tryblidiida Lemche, 1957 see Order Monoplacophorida Wenz, in Knight, 1952 Genus †Tryblidium Lindström, 1880