Phylum Brachiopoda Duméril, 1806 - brachiopods
   Subphylum Rhynchonelliformea Williams et al., 1996
     Class Rhynchonellata Williams et al., 1996
       Order †Athyridida Boucot et al., 1964
         Suborder †Retziidina Boucot et al., 1964
           Superfamily †Retzioidea Waagen, 1883
             1 Family †Retziidae Waagen, 1883
             2 Family †Neoretziidae Dagis, 1972