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 †Cyrtolites Conrad, 1838
           Genus †Latouchella Cobbold, 1921
           Genus †Lenaella Byalyi, 1973, nom. illeg.
           Genus †Nyuella Rozov, 1975
           Genus †Scenella Billings, 1872
           Genus †Yochelcionella Runnegar & Pojeta, 1974