Phylum Brachiopoda Duméril, 1806 - brachiopods Subphylum Rhynchonelliformea Williams et al., 1996 Class Rhynchonellata Williams et al., 1996 Order Rhynchonellida Kuhn, 1949 Superfamily †Rhynchonelloidea d'Orbigny, 1847 1 Family †Rhynchonellidae Gray, 1848 2 Family †Acanthothirididae Schuchert, 1913