Evolution of terrestrial anatomy revealed by a derived stem tetrapod

The American Museum of Natural History announced that the specimen long celebrated as the “first reptile” is not a reptile at all, stripping the museum and related exhibits of a marquee evolutionary claim. The fossil, nicknamed “Lizzie,” had underpinned narratives about the earliest vertebrates to colonize land. By overturning that classification, paleontologists and museum curators stand to lose a headline attraction, while researchers gain a clearer model of early tetrapod anatomy.

Techlicious highlighted the imaging results, and Bioengineer.org emphasized how the reinterpretation rewrites the story of vertebrate terrestrial locomotion. Phys.org echoed the dethroning of the “world’s oldest reptile” label, reinforcing the shift toward a tetrapod‑centric evolutionary framework. Most outlets align on the reclassification, yet some coverage still refers to the specimen as the “oldest reptile,” reflecting lingering reliance on earlier taxonomy.

The consensus now positions the fossil as a key data point for studying the evolution of land‑adapted anatomy, while the outdated reptile label recedes. Ongoing research will likely focus on how this stem tetrapod bridges morphological gaps between aquatic ancestors and true amphibians.