The discovery of two 210-million-year-old crocodile cousins in New Mexico offers a rare glimpse into the diversification of early reptiles just before the rise of dinosaurs.
Researchers identified the fossils as Hesperosuchus agilis and Eosphorosuchus lacrimosa. The fossils were preserved due to a flash flood that occurred at the time of their death. This preservation provides significant insights into the evolutionary history of proto-crocodiles.
Key facts:
- The two fossils date back to the Triassic period, a critical time for reptilian evolution.
- Hesperosuchus agilis was a long-snouted crocodile that likely hunted near rivers and streams.
- Eosphorosuchus lacrimosa, a newly identified species, had robust jaw muscles for snapping at large prey.
This fossil discovery represents a pivotal moment in the diversification of proto-crocodiles. During the Triassic period, two reptile dynasties competed for dominance — one leading to modern crocodiles and alligators, and the other evolving into dinosaurs and birds. The ecosystem was rich, with close relatives developing specialized feeding anatomy.
Margulis-Ohnuma, a researcher involved in the study, noted, “Eosphorosuchus is one of only a handful of well-preserved early crocodile relatives, and its coexistence with Hesperosuchus represents the ‘dawn’ of functional diversification in the lineage that would give rise to modern crocodiles.” This statement underscores the significance of these findings in paleontology.
The fossils were found in large blocks of rock at the Peabody Museum of Natural History at Yale University. Researchers aim to further study these specimens to enrich understanding of early reptilian evolution.
