Phylum Brachiopoda Duméril, 1806 - brachiopods Subphylum Rhynchonelliformea Williams et al., 1996 Class Rhynchonellata Williams et al., 1996 Order †Athyridida Boucot et al., 1964 Superfamily †Dayioidea Waagen, 1883 1 Family †Dayiidae Waagen, 1883