Early Dinosaurs (Triassic) - Shop


EARLY DINOSAURS

About 230 million years ago--give or take a few million years--the first dinosaurs evolved from the archosaurs, the "ruling lizards" that shared the earth with other families of early reptiles, including therapsids and pelycosaurs. As a group, dinosaurs are defined by a host of (mostly obscure) anatomical features, but to simplify matters a bit, the main thing that distinguished them from their archosaur forebears was their erect posture (either bipedal or quadrupedal), as evidenced by the shape and arrangement of their hip and leg bones.


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