Inarticulata was historically defined as one of the two classes of the phylum Brachiopoda and referred to those having no hinge. The other class was Articulata, meaning articulated — having a hinge between the dorsal and ventral valves. These classifications have now been superseded, see brachiopod classification.
- Treatise on Invertebrate Paleontology — also mentions the new Brachiopoda classification system
- Shipley, Arthur Everett (1911). Encyclopædia Britannica. 4 (11th ed.). Cambridge University Press. p. 360. . In Chisholm, Hugh (ed.).