Coelophysis
Late Triassic theropod dinosaur from the southwestern United States.
It was a small, slenderly built, ground-dwelling, bipedal carnivore that could grow up to 3 m (9.8 ft) long, and is one of the earliest known dinosaur genera. The names Longosaurus and Rioarribasaurus are synonymous with Coelophysis, and it is one of the most specimen-rich dinosaur genera.
- field
- Paleontology
- known_for
- One of the earliest known dinosaur genera; one of the most specimen-rich dinosaur genera
Lore & Background
Cope named two new species: Coelurus longicollis and Coelurus bauri, the latter named after German paleontologist Georg Baur. Later that year, Cope reclassified the material into the genus Coelophysis, creating Coelophysis longicollis and Coelophysis bauri.
Reader's Guide
Coelophysis is significant as one of the earliest known dinosaur genera and one of the most specimen-rich, providing extensive insight into Late Triassic theropod anatomy and behavior. The abundance of specimens has allowed detailed study of growth, variation, and possible social behavior, though interpretations of species within the genus have been debated. The genus Megapnosaurus was once considered a species of Coelophysis, but that interpretation has been challenged and Megapnosaurus is now considered valid.
Did You Know?
- Coelophysis is one of the most specimen-rich dinosaur genera, with hundreds of skeletons found at Ghost Ranch.
- The names Longosaurus and Rioarribasaurus are synonymous with Coelophysis.
Frequently Asked Questions
What is Coelophysis?
Coelophysis was a small, slender, two-legged ground-dwelling carnivore and one of the earliest dinosaur genera ever recognized. It belongs to the theropod group and is a foundational species in early dinosaur history.
How big did Coelophysis get?
It could grow to roughly three meters (about 9.8 feet) in total length. Despite that, it was still a relatively small and lightly built predator compared to later theropods.
When and where did Coelophysis live?
It roamed the southwestern United States during the Late Triassic period, placing it well before the Jurassic and Cretaceous eras most people associate with dinosaurs.
Why is Coelophysis so important to paleontology?
As one of the earliest known dinosaur genera, it helps anchor the timeline of when dinosaurs first appeared. It is also among the most specimen-rich dinosaur genera, giving scientists an unusually large fossil record to work with.
Are there other names for Coelophysis?
Yes—Longosaurus and Rioarribasaurus are both considered synonyms, meaning they refer to the very same animal. All three names point to the same Late Triassic theropod.
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