Phylum Brachiopoda Duméril, 1806 - brachiopods
   Subphylum Rhynchonelliformea Williams et al., 1996
     Class Rhynchonellata Williams et al., 1996
       Order †Spiriferida Waagen, 1883
         Suborder †Delthyridina Ivanova, 1972
           Superfamily †Delthyridoidea Phillips, 1841
             1 Family †Delthyrididae Waagen, 1883
             2 Family †Hysterolitidae Termier & Termier, 1949
             3 Family †Acrospiriferidae Termier & Termier, 1949
             4 Family †Cyrtinopsidae Wedekind, 1926
             5 Family †Mucrospiriferidae Pitrat, 1965