Peltosaurus Facts
| Diet | Carnivore |
| Height | 0.1m |
| Length | 0.5m |
| Weight | 200 g |
| Environment | Land |
| Era | Cenozoic |
| Period | Paleogene |
| Type | Other |
| Location | North America |

| Diet | Carnivore |
| Height | 0.1m |
| Length | 0.5m |
| Weight | 200 g |
| Environment | Land |
| Era | Cenozoic |
| Period | Paleogene |
| Type | Other |
| Location | North America |
Although once thought to be connected to dinosaurs, Peltosaurus is now known to be an extinct genus of anguid lizard that lived in North America from the Eocene to Miocene periods, approximately 56 to 34 million years ago. This fascinating prehistoric reptile belonged to the subfamily Glyptosaurinae, a group of heavily armoured lizards that dominated terrestrial ecosystems long after the dinosaurs had vanished.
Peltosaurus was a medium-sized lizard, measuring roughly half a metre in length. Its most distinctive feature was its heavily armoured body, covered in thick, bony plates called osteoderms that provided excellent protection from predators. These shield-like scales gave the creature its name, which means 'shield lizard'. The type species, Peltosaurus granulosus, was characterised by granular texturing on these protective plates.
As a carnivorous reptile, Peltosaurus likely fed on insects, small mammals, and other vertebrates that shared its environment. Its robust build and protective armour suggest it was well-adapted to a terrestrial lifestyle, possibly spending time both on the ground and in low vegetation. The creature inhabited the warm, forested landscapes of Paleogene North America, when the climate was considerably warmer than today.
Originally, many species were assigned to Peltosaurus, but subsequent research has shown that most belong to different genera entirely. Today, only the original species P. granulosus and P. macrodon from California are considered valid members of this genus, highlighting how our understanding of prehistoric life continues to evolve through careful scientific study.
Peltosaurus was distinguished by its heavily armoured body covered in thick, bony plates called osteoderms that formed a shield-like covering. The type species had distinctively granular texturing on these protective scales, giving it a rough, bumpy appearance.
Peltosaurus likely spent its time foraging on the ground and in low vegetation, using its armoured body for protection from larger predators. As a carnivorous lizard, it would have been an active hunter, pursuing insects and small vertebrates in the warm forests of Paleogene North America.
Peltosaurus was first described by Edward Drinker Cope in 1873. The original fossils were discovered at Western United States.