Name: Effigia (Ghost).
Named By: Sterling J. Nesbitt & Mark Norell - 2006.
Classification: Chordata, Reptilia, Diapsida, Archosauromorpha, Crurotarsi, Rauisuchia, Poposauridae.
Species: E. okeeffeae (type).
Size: 2 meters long.
Known locations: USA, New Mexico, Chinle Formation, Ghost Ranch.
Time period: Triassic.
Fossil representation: 1 almost complete skeleton, 3 partial skeletons.
Effigia resembles and ornithomimid
dinosaur, it is
thought that this is
just a case of convergent evolution. Later studies have suggested that
Effigia is the same creature as the archosaur Chatterjeea
and that both
are synonymous with the archosaur Shuvosaurus.
The type specimen is named after the renowned artist Georgia O'Keeffe, whose ashes were scattered at Ghost Ranch.
- Extreme convergence in the body plans of an early suchian (Archosauria) and ornithomimid dinosaurs (Theropoda). - Proceedings of the Royal Society of London B. - S. J. Nesbitt& M. A. Norell - 2006.
- The anatomy of Effigia okeeffeae (Archosauria, Suchia), theropod-like convergence, and the distribution of related taxa. - Bulletin of the American Museum of Natural History, 302: 84 pp. - S. Nesbitt - 2007.