Phylum Brachiopoda Duméril, 1806 - brachiopods Subphylum Rhynchonelliformea Williams et al., 1996 Class †Obolellata Order †Obolellida Rowell, 1965 Superfamily †Obolelloidea Walcott & Schuchert, 1908 1 Family †Obolellidae Walcott & Schuchert, 1908 2 Family †Trematobolidae Williams et al., 2000