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Acrotretidina


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(class Inarticulata, order Acrotretida)

A suborder of inarticulate brachiopods that have phosphatic shells. Throughout life they are attached to the sea-bed by a pedicle. They first appeared in the Early Cambrian. There are three superfamilies, seven families, and about 50 genera.

Subjects: Zoology and Animal Sciences.


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