Class Scaphopoda Bronn, 1862 - tusk shells
   Order Gadilida Starobogatov, 1974
     Suborder Entalimorpha Steiner, 1992 [monotypic]
       Family Entalinidae Chistikov, 1979
         1 Subfamily Bathoxiphinae Chistikov, 1983
         2 Subfamily Entalininae Chistikov, 1979 [monotypic]
         3 Subfamily Heteroschismoidinae Chistikov, 1982