Phylum Brachiopoda Duméril, 1806 - brachiopods
   Subphylum Rhynchonelliformea Williams et al., 1996
     Class †Strophomenata Williams et al, 1996
       Order †Orthotetida Waagen, 1884
         Suborder †Orthotetidina Waagen, 1884
           Superfamily †Orthotetoidea Waagen, 1884
             1 Family †Orthotetidae Waagen, 1884
             2 Family †Pulsiidae Cooper & Grant, 1974
             3 Family †Orthotetellidae Cooper & Grant, 1974
             4 Family †Derbyiidae Stehli, 1954
             5 Family †Meekellidae Stehli, 1954
             6 Family †Schuchertellidae Williams, 1953