brachiopod's diductor muscles. In some rhynchonelliforms, the dental plates are enlarged to the point that they converge into a bowl-shaped structure known as a spondylium.

Cardinalia

Internally, the rear part of the dorsal valve is complex, bearing a variety of calcified structures originating near the hinge line. These structures, termed cardinalia, come in many varieties with crest-like, plate-like, or prong-like shapes. Cardinal processes host muscle attachments, clustering near the hinge line or projecting

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