Phylum Mollusca Linnaeus, 1758 - molluscs Subphylum Conchifera Gegenbauer, 1878 Class Monoplacophora Odhner, 1940 - monoplacophorans Order Monoplacophorida Wenz, in Knight, 1952 Superfamily Tryblidioidea Pilsbry, 1899 Family Monoplacophoridae Moskalev et al., 1983