Carlson, Sandra J. Department of Geology, University of California, Davis, California.
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An order of inarticulated brachiopods. Together with Lingulida and Siphonotretida, Acrotretida is one of the three orders of inarticulated brachiopods currently classified in class Lingulata in subphylum Linguliformea (phylum Brachiopoda). Previously, Acrotretida was considered to include not only superfamily Acrotretacea, but also Discinacea (now in Lingulida), Siphonotretacea (now a separate order), and Craniacea (now a separate subphylum). At present, within the revised taxonomic scheme, the concept of Acrotretida has been pared down to include only those taxa in Acrotretacea (now Acrotretoidea). See also: Brachiopoda
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