Ureillas

The Ureillas are a genus of extinct crocodylomorphs that lived during the Triassic period. They are characterized by their elongated skulls, which are unlike those of modern crocodilians.

Fossil evidence of the Ureillas has been found in Argentina and Uruguay. The type species, Ureilia tenuidens, was first described in 1926. Since then, several other species have been discovered, including U. grandis and U. chimaera. These species are known from fragmentary remains, including skulls, jaws, and vertebral columns.

The Ureillas were among the first known terrestrial archosaurs, and their skull shapes suggest that they may have been adapted to a more fish-eating lifestyle than their modern relatives. However, more research is needed to understand their habits and environments.

In terms of phylogenetic relationships, the Ureillas are thought to be members of the group Phytosauria, which also includes the group Rauisuchia. These groups are characterized by their terrestrial habits and relatively long, narrow skulls.

Despite the discovery of several Ureilla species, there is still much to be learned about these ancient crocodylomorphs. Further research is needed to understand their evolution, habits, and environments. The study of the Ureillas provides insight into the diversity of early archosaurs and the evolution of the group over time.