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 Birasoherpia Salvini-Plawen, 1978
         3 Genus Biserramenia Salvini-Plawen, 1967
         4 Genus Sialoherpia Salvini-Plawen, 1978
         5 Genus Uncimenia Nierstrasz, 1903