Phylum Brachiopoda Duméril, 1806 - brachiopods Subphylum Rhynchonelliformea Williams et al., 1996 Class †Strophomenata Williams et al, 1996 Order †Strophomenida Opik, 1934 Superfamily †Plectambonitoidea Jones, 1928 Family †Syndielasmatidae Cooper, 1956