Phylum Brachiopoda Duméril, 1806 - brachiopods
   Subphylum Rhynchonelliformea Williams et al., 1996
     Class Rhynchonellata Williams et al., 1996
       Order †Orthida Schuchert & Cooper, 1932
         Suborder †Orthidina Schuchert & Cooper, 1932
           Superfamily †Orthoidea Woodward, 1852
             01 Family †Orthidae Woodward, 1852
             02 Family †Anomalorthidae Ulrich & Cooper, 1936
             03 Family †Bohemiellidae Havlicek, 1977
             04 Family †Glyptorthidae Schuchert & Cooper, 1931
             05 Family †Hesperonomiidae Ulrich & Cooper, 1936
             06 Family †Hesperorthidae Schuchert & Cooper, 1931
             07 Family †Lycophoriidae Schuchert & Cooper, 1931
             08 Family †Nanorthidae Havlicek, 1977
             09 Family †Orthidiellidae Ulrich & Cooper, 1936
             10 Family †Plaesiomyidae Schuchert, 1913
             11 Family †Poramborthidae Havlicek, 1950
             12 Family †Productorthidae Schuchert & Cooper, 1931
             13 Family †Whittardiidae Williams, 1974