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Acrotretida


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(phylum Brachiopoda, class Inarticulata)

An order that comprises two suborders of brachiopods which are usually circular or semicircular in outline. The shell is either phosphatic or punctate calcareous. The pedicle opening is restricted to the pedicle valve. The shell beak is marginal to subcentral in position.

Subjects: Zoology and Animal Sciences.


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