Phylum Mollusca Linnaeus, 1758 - molluscs
   Conchifera Gegenbaur, 1878 see Subphylum Conchifera Gegenbauer, 1878
     Class Scaphopoda Bronn, 1862 - tusk shells
       Order Gadilida Starobogatov, 1974
         Suborder Entalimorpha Steiner, 1992 [monotypic]
           Family Entalinidae Chistikov, 1979
             Subfamily Heteroschismoidinae Chistikov, 1982
               1 Genus Costentalina Chistikov, 1982
               2 Genus Entalinopsis Habe, 1957
               3 Genus Heteroschismoides Ludbrook, 1960
               4 Genus Pertusiconcha Chistikov, 1982
               5 Genus Spadentalina Habe, 1963