The clade Dinosauria (which means "terrible lizard" in Greek) was coined in 1842 by the English paleontologist Richard Owen, who included the meat-eating theropod Megalosaurus, the long-necked sauropodomorph Cetiosaurus and the ornithiscian Iguanodon as the first known species in the clade, according to the book " Dinosaurs Rediscovered" (Thames & Hudson, 2019).Įach of these dinosaurs, it turns out, represents one of the three major dinosaur groups. In fact, dinosaurs "didn't become too successful right away the crocs ruled the Triassic, then the end-Triassic extinction hit and the dinosaurs survived and took over." Initially, dinosaurs were not as diverse as the crocodile-like archosaurs they were living alongside, Brusatte noted. "You're not at the whims of the environment in terms of being active."
"When you become a warm blooded animal, you can operate 24/7," Erickson told Live Science. Moreover, dinosaurs were likely warm blooded, according to research on their growth rates.
Ultimately, having free arms "allowed gliding then flight in birds," he said. Having an upright posture also freed the hands, allowing dinosaurs such as iguanodonts to grasp branches and carnivorous dinosaurs to claw and kill prey, noted Gregory Erickson, a paleobiologist at Florida State University. This unique anatomy helped dinosaurs become successful. The differences between the two are small, but dinosaurs' anatomy offered increased benefits, including arms that could move in and out, neck vertebrae that could support stronger muscles than before, and a joint where the thigh bone meets the pelvis, Brusatte wrote. Some dinosauromorphs evolved into dinosaurs. Their unique anatomy, such as their strong necks and upright posture, gave them advantages over other animal groups.
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