Pectínidos de la Formación Paraná (Mioceno) Entre Ríos, Argentina

the three species of pectinids (bivalvia: pectinidae) from the paraná formation (miocene) in the province of ente ríos are described. these are aequipecten paranensis (d'orbigny, 1842), amusium darwinianum (d'orbigny, 1842) and flabellipecten oblongus (philippi, 1893). localities are listed and the importance of these bivalves in the determination of the paleoenvironmental conditions under which the bearing unit was deposited is assessed.