Phylum Brachiopoda Duméril, 1806 - brachiopods
   Subphylum Rhynchonelliformea Williams et al., 1996
     Class Rhynchonellata Williams et al., 1996
       Order †Athyridida Boucot et al., 1964
         Suborder †Athyrididina Boucot et al., 1964
           1 Superfamily †Athyridoidea McCoy, 1841
           2 Superfamily †Meristelloidea Waagen, 1883
           3 Superfamily †Nucleospiroidea Davidson, 1881
           4 Superfamily †Retzielloidea Rzhonsnitskaya, 1974