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
           Superfamily †Meristelloidea Waagen, 1883
             1 Family †Meristellidae Waagen, 1883
             2 Family †Meristidae Hall & Clarke, 1895
             3 Family †Triathyrididae Alvarez et al., 1998