Subphylum Craniiformea


The pedicle is absent from species in the subphylum Craniiformea.  Craniiform shells are composed of calcium carbonate.  The sole surviving craniiform order is the Craniidae.  The craniiforms are in fact thought to be more closely related to the articulate subphylum Rhynochonelliformea than they are to the inarticulate Linguliformea.


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