Phylum Brachiopoda Duméril, 1806 - brachiopods
   Subphylum Rhynchonelliformea Williams et al., 1996
     Class Rhynchonellata Williams et al., 1996
       Order †Orthida Schuchert & Cooper, 1932
         Suborder †Dalmanellidina Moore, 1952
           Superfamily †Dalmanelloidea Schuchert, 1913
             01 Family †Dalmanellidae Schuchert, 1913
             02 Family †Angusticardiniidae Schuchert & Cooper, 1931
             03 Family †Dicoelosiidae Cloud, 1948
             04 Family †Harknessellidae Bancroft, 1928
             05 Family †Heterorthidae Schuchert & Cooper, 1931
             06 Family †Hypsomyoniidae
             07 Family †Kayserellidae Wright, 1965
             08 Family †Mystrophoridae Schuchert & Cooper, 1931
             09 Family †Paurorthidae Opik, 1933
             10 Family †Platyorthidae Harper et al., 1969
             11 Family †Portranellidae Williams et al., 2000
             12 Family †Proschizophoriidae Boucot et al., 1966
             13 Family †Rhipidomellidae Schuchert, 1913
             14 Family †Tyronellidae Mitchell, 1977