living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Mollusca Linnaeus, 1758 - molluscs
           Class Solenogastres Gegenbaur, 1878
             Order Cavibelonia Salvini-Plawen, 1978
               Family Simrothiellidae Salvini-Plawen, 1978
                 1 Genus Simrothiella Pilsbry, 1898
                 2 Genus Cyclomenia Nierstrasz, 1902
                 3 Genus Uncimenia Nierstrasz, 1903
                 4 Genus Biserramenia Salvini-Plawen, 1967
                 5 Genus Birasoherpia Salvini-Plawen, 1978
                 6 Genus Sialoherpia Salvini-Plawen, 1978