coelophysid

Coelophysidae is a family of early theropod dinosaurs that lived during the Late Triassic and Early Jurassic periods. These dinosaurs are characterized by their slender, lightweight build, long legs, and hollow bones, adaptations that suggest they were agile and fast runners. Coelophysids are among the most primitive known theropods, offering insights into the early evolution of this diverse dinosaur group.

The most famous coelophysid is Coelophysis, whose remains were found in large numbers at the Ghost Ranch fossil site in New Mexico. The discovery of numerous skeletons, including evidence of possible cannibalism and internal young, has provided valuable information about coelophysid behavior and reproduction. Other well-known members of the family include Procompsognathus and Megapnosaurus.

Coelophysids were generally small to medium-sized predators, typically measuring between 1.5 to 6 meters in length. Their skulls were elongated and narrow, with sharp, serrated teeth adapted for slicing flesh. They likely hunted small animals, such as lizards, mammals, and possibly other dinosaurs. The discovery of coelophysid fossils on multiple continents suggests a wide geographic distribution during their time. Their existence highlights the early diversification of carnivorous dinosaurs shortly after the emergence of dinosaurs themselves.