Classification of brachiopods Taxonomic Classification: Brachiopods belong to Kingdom Animalia, Phylum Brachiopoda. Brachiopods have usually been divided into two classes, Articulata and Inarticulata. Formal classification schemas recognise three subphyla, each containing several extinct and extant orders: Aug 30, 2024 ยท Brachiopod Classification. The Articulata have toothed hinges between the valves, while the hinges of the Inarticulata are held together only by muscles. Valve shape varies widely. By matching the brachiopod species contained within rocks deposited in different locations, paleontologists can determine that the rock units were deposited at the same time. Brachiopods belong to the Phylum Brachiopoda, traditionally divided into two classes: Class Inarticulata (including Order Lingulida) Class Articulata (including various orders such as Orthida, Pentamerida, Productida, Rhynchonellida, Spiriferida, Strophomenida, and Terebratulida). viii 132 pp. Class Inarticulata: Lack teeth and sockets, held together by adductor muscles, shells made of chitin and calcium phosphate. Carlson, S. xtkweqnpndpjmlvxqptqqvgcrgjksdswdnvfyynlhvwblhqfdoriigogjtrvptnjfalhmnajdmqwdn