During the Early Ordovician, a great increase in the diversity of bivalve species occurred, and the dysodont, heterodont, and taxodont dentitions evolved.
2.
In 2010, Bieler, Carter & Coan proposed a new classification system for the Bivalvia which combines the taxodont Arcoida with the dysodont Limnoida Mytiloida, Ostreoida and Pteroida as the Pteriomorphia.
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