Phylum Mollusca Linnaeus, 1758 - molluscs
   Subphylum Conchifera Gegenbauer, 1878
     Class Monoplacophora Odhner, 1940 - monoplacophorans
       Order Monoplacophorida Wenz, in Knight, 1952
         Superfamily Tryblidioidea Pilsbry, 1899
           1 Family Laevipilinidae Moskalev et al., 1983
           2 Family Monoplacophoridae Moskalev et al., 1983
           3 Family Neopilinidae Knight & Yochelson, 1958
           4 Family Vemidae Moskalev et al., 1983