Craniforma

Craniata (formerly Craniforma) is a class of Brachiopod originating in the Cambrian period and still extant today. They have calcitic inarticulated shells that are subcircular in outline. This subphylum of brachiopod has an unsupported lophophore and is always attached to a hard substrate in the fossil record. This hard substrate is usually anothe...
Found on http://en.wikipedia.org/wiki/Craniforma
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