Twentyfour nearly complete carapace samples were collected at three different localities of the Maastrichtian (Late Cretaceous) Cardenas Formation in San Luis Potosi, eastcentral Mexico. The material has been assigned to ...
Transition zones, located at the boundaries between biogeographic regions, represent events of biotic hybridization, promoted by historical and ecological changes. They deserve special attention, because they represent ...
Integración de varias ideas y trabajos de los autores. Aquí se muestra que la teoría de los conjuntos es un instrumento
indispensable para la enseñanza de la biología comparada.