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(phylum Brachiopoda)

Order of brachiopods with biconvex, calcareous shells, and cardinal areas in both valves. No teeth or sockets are found. In the past this group of Lower Cambrian fossils has been assigned to both the Inarticulata and Articulata classes, but it is suspected to have been derived independently of these classes and in the future may come to be regarded as a distinct class.

Subjects: Earth Sciences and Geography.

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