A New Species of Calyptraphorus (Mesogastropoda: Strombidae) from the Maastrichtian of Southern Mexico; Some Paleobiogeographic and Evolutionary Implications

Abstract

A new species of strombid gastropod is described from the lower Maastrichtian deposits from the Mexcala Formation, Guerrero State, southern Mexico. More than 300 specimens of the new species were collected at one locality. The specimens include all stages of development, from juveniles to adults. Paleobiogeographic and evolutionary analysis for the genus of this gastropod suggests that it had a wide distribution around the Tethyan Province, and that after the K-T event, the genus migrated northward, until the Eocen e, when it became extinct.