Phylum Brachiopoda Duméril, 1806 - brachiopods Subphylum Rhynchonelliformea Williams et al., 1996 Class Rhynchonellata Williams et al., 1996 Order Rhynchonellida Kuhn, 1949 Superfamily Dimerelloidea Buckman, 1918 1 Family †Dimerellidae Buckman, 1917 2 Family †Peregrinellidae Ager, 1965 3 ?Family †Halorellidae Ager, 1965 4 ?Family Cryptoporidae Muir-Wood, 1955