Perteneciente a la familia Ceratopsidae

This specialized skull is believed to have enabled Diplocaulus magnicornis to swim efficiently in the ancient lakes and rivers where it lived

instead of out to the sides

con un cráneo de 83 centímetros

it is considered extinct

Xiphactinus audax Variante:Sin imprimar Perteneciente a la familia CeratopsidaeXiphactinus audax was a large predatory bony fish from the Late Cretaceous of North America, known primarily from fossils recovered from marine deposits of the former Western Interior Seaway, especially the Niobrara Formation of Kansas, although its distribution extended across much of the North American interior basin. Originally described by Joseph Leidy in 1870, this taxon belongs to Ichthyodectiformes, a group of Mesozoic actinopterygian fishes