Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Monoplacophora Odhner, 1940 [monotypic] - monoplacophorans
     Order Monoplacophorida Wenz, in Knight, 1952
       Superfamily Trybliidioidea Millard, 1997, orth. inval. see Superfamily Tryblidioidea Pilsbry, 1899
         1 Family Neopilinidae Knight & Yochelson, 1958
         2 Family Vemidae Moskalev et al., 1983 [monotypic]
         3 Family Monoplacophoridae Moskalev et al., 1983 [monotypic]
         4 Family Laevipilinidae Moskalev et al., 1983 [monotypic]