Protorthida is an extinct order of Rhynchonellate brachiopods containing the taxa:[1]
Superfamily Protorthoidea
Family Protorthidae
Family Arctohedridae
Family Leioriidae
Superfamily Skenidioidea
Family Skenidiidae
References
↑Williams, Alwyn; Brunton, C.H.C.; Carlson, S.J.; etal. (1997–2007). Kaesler, Roger L.; Selden, Paul (eds.). Part H, Brachiopoda (Revised). Treatise on Invertebrate Paleontology. Boulder, Colorado; Lawrence, Kansas: Geological Society of America; University of Kansas.
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