Phylum Brachiopoda Duméril, 1806 - brachiopods
   Subphylum Rhynchonelliformea Williams et al., 1996
     Class Rhynchonellata Williams et al., 1996
       Order Terebratulida Waagen, 1883
         Suborder Terebratulidina Waagen, 1883
           Superfamily Dyscolioidea Fischer & Oehlert, 1891
             1 Family Dyscoliidae Fischer & Oehlert, 1891
             2 Family †Pygopidae Boulenger, 1884
             3 Family †Nucleatidae Schuchert, 1929