Phylum Brachiopoda Duméril, 1806 - brachiopods
   Subphylum Linguliformea Williams et al., 1996
     Class Lingulata Gorjansky & Popov, 1985
       Order †Acrotretida Kuhn, 1949
         Superfamily †Acrotretoidea Schuchert, 1893
           1 Family †Acrotretidae Schuchert, 1893
           2 Family †Scaphelasmatidae Rowell, 1965
           3 Family †Torynelasmatidae Rowell, 1965
           4 Family †Ephippelasmatidae Rowell, 1965
           5 Family †Biernatidae Holmer, 1989
           6 Family †Ceratretidae Rowell, 1965
           7 Family †Eoconulidae Rowell, 1965
           8 Family †Curticiidae Walcott & Schuchert, 1908