Temporal range: Middle Jurassic – Upper Cretaceous
von Huene, 1914
Some diagnostic characteristics of coelurosaurs include elongated arms and well-developed hinge-like ankles (possible rotation of the ankle is reduced, which is helpful during locomotion). These features may be lost or modified by later coelurosaurs (birds, for example).
Fossil history[change | change source]
A few fossil traces of the Coelurosauria date back as far as the Upper Triassic. A possible, but not confirmed, example would be the archosaur Protoavis. What has been found between then and the start of the late Jurassic is fragmentary.
Many nearly complete fossil coelurosaurians are known from the late Jurassic. Archaeopteryx is known from Solnhofen limestone at 155-150 million years ago (mya). Ornitholestes, the troodontid WDC DML 110, Coelurus fragilis and Tanycolagreus topwilsoni are all known from the Morrison Formation in Wyoming at about 150 mya. Epidendrosaurus and Pedopenna are known from the Daohugou Beds in China, whose age is still being debated, but may be about 160 Ma or 145 mya.
The wide range of fossils in the late Jurassic and morphological evidence suggests that coelurosaurian differentiation was virtually complete before the end of the Jurassic.
In the early Cretaceous, a superb range of coelurosaurian fossils (including avians) are known from the Yixian Formation in Liaoning. All known theropod dinosaurs from the Yixian Formation are coelurosaurs. Many of the coelurosaurian lineages survived to the end of the Cretaceous period (about 65 Ma) and fossils of some lineages, such as the Tyrannosauroidea, are best known from the late Cretaceous. Most coelurosaur groups became extinct in the K/T extinction event. Only the Neornithes (modern birds) survived, and continued to diversify into the numerous forms found today.
Related pages[change | change source]
References[change | change source]
- Currie, Philip J. (2005). Dinosaur Provincial Park: a spectacular ancient ecosystem revealed. Indiana University Press. p. 368. ISBN 0253345952.
- Larsson H.C.E. 2001. Endocranial anatomy of Carcharodontosaurus saharicus (Theropoda: Allosauroidea) and its implications for theropod brain evolution. pp. 19–33. In: Mesozioc Vertebrate Life. eds Tanke D.H; Carpenter K. & Skrepnick M.W. Indiana University Press, p19.
- Dinodata: Coelurosauria
- Padian K. 2004. Basal Avialae. In: Weishampel D.B; Dodson P. and Osmólska H. (eds) The Dinosauria. 2nd ed, University of California Press, Berkeley, 210–231. ISBN 0-520-24209-2