Phylum Brachiopoda Duméril, 1806 - brachiopods Subphylum Rhynchonelliformea Williams et al., 1996 Class Rhynchonellata Williams et al., 1996 Order †Spiriferida Waagen, 1883 Suborder †Spiriferidina Waagen, 1883 Superfamily †Brachythyridoidea Frederiks, 1924 1 Family †Brachythyrididae Fredericks, 1924 2 Family †Skelidorygmidae Carter, 1994