Phylum Brachiopoda Duméril, 1806 - brachiopods Subphylum Rhynchonelliformea Williams et al., 1996 Class Rhynchonellata Williams et al., 1996 Order Thecideida Pajaud, 1970 1 Superfamily †Thecospiroidea Bittner, 1890 2 Superfamily Thecideoidea Gray, 1840