Phylum Brachiopoda Duméril, 1806 - brachiopods Subphylum Rhynchonelliformea Williams et al., 1996 Class Rhynchonellata Williams et al., 1996 Order Terebratulida Waagen, 1883 Suborder Terebratulidina Waagen, 1883 Superfamily Dyscolioidea Fischer & Oehlert, 1891 Family †Nucleatidae Schuchert, 1929