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
               01 Family Pararrhopaliidae Salvini-Plawen, 1972 see Family Pruvotinidae Heath, 1911, nom. corr.
               02 Family Rhopalomeniidae Salvini-Plawen, 1978
               03 Family Acanthomeniidae Salvini-Plawen, 1978
               04 Family Amphimeniidae Salvini-Plawen, 1972
               05 Family Simrothiellidae Salvini-Plawen, 1978
               06 Family Drepanomeniidae Salvini-Plawen, 1978
               07 Family Strophomeniidae Salvini-Plawen, 1978
               08 Family Proneomeniidae Simroth, 1893
               09 Family Epimeniidae Salvini-Plawen, 1978
               10 Family Syngenoherpiidae Salvini-Plawen, 1978
               11 Family Rhipidoherpiidae Salvini-Plawen, 1978