Phylum [Mollusca] Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
       Order Archaegastropoda see Order Archaeogastropoda Thiele, 1925
         Superfamily Pleurotomariacea see Superfamily Pleurotomarioidea Swainson, 1840
           Family Pleurotomariidae Swainson, 1840 - slit snails
             Genus Perotrochus Fischer, 1885
               Subgenus Perotrochus (Entemnotrochus) Fischer, 1885 see Genus Entemnotrochus Fischer, 1885