Pecten

Pecten, the type-genus of the Scollops or family Pectinidce. They are bivalve Mollusca, with generally ribbed shells, but always provided with a pair of "ears" to each valve of the shell. They commence in the Trias, after which they are abundant as fossils. The genus has often been quoted from Palieozoic rocks, but these belong to other genera, such as Aviculopecten, Pemopeeten, etc. Those scollops with smooth shells are often separated as the genus Entolium.