Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Brachiopoda Duméril, 1806 - brachiopods
     Class Articulata Huxley, 1869
       Order Terebratulida Waagen, 1883
         Genus Argyrotheca Dall, 1900
         Genus †Centronella Billings, 1859
         Genus †Cryptacanthia White & St. John, 1867
         Genus Dallina Beecher, 1895
         Genus †Dallithyris Muir-Wood, 1959
         Genus †Dielasma King, 1859
         Genus Ecnomiosa Cooper, 1977
         Genus †Goniothyris Buckman, 1914
         Genus Liothyrella Thomson, 1916
         Genus Megathiris d'Orbigny, 1847
         Genus †Monsardithyris Almeras, 1971
         Genus †Plectothyris Buckman, 1917
         Genus †Pseudoglossothyris Buckman, 1901
         Genus Terebratalia Beecher, 1893
         Genus †Terebratula Müller, 1776
         Genus Terebratulina d'Orbigny, 1847
         Genus †Waconella Owen, 1970
         Genus Waltonia Davidson, 1850 see Subgenus Waltonia