Phylum Brachiopoda Duméril, 1806 - brachiopods Subphylum Rhynchonelliformea Williams et al., 1996 Class Rhynchonellata Williams et al., 1996 Order Thecideida Pajaud, 1970 Superfamily Thecideoidea Gray, 1840 1 Family †Enallothecideidae (Baker, 1983) 2 Family Thecidellinidae Elliott, 1958 3 Family †Bactryniidae Williams, 1965 4 Family Thecideidae Gray, 1840