| Callawayasaurus Temporal range: Early Cretaceous,
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| Skull of Callawayasaurus colombiensis displayed in the Paleontological Museum of Villa de Leyva | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Superorder: | †Sauropterygia |
| Order: | †Plesiosauria |
| Family: | †Elasmosauridae |
| Genus: | †Callawayasaurus Carpenter, 1999 |
| Species: | †C. colombiensis
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| Binomial name | |
| †Callawayasaurus colombiensis (Wells, 1962 [originally Alzadasaurus])
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| Synonyms | |
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Callawayasaurus is a genus of plesiosaur from the family Elasmosauridae. When the holotype was first described by Samuel Paul Welles in 1962,[1] it was described as Alzadasaurus colombiensis before being moved into its current genus by Kenneth Carpenter in 1999.[2]
- ^ S. P. Welles. (1962). A new species of elasmosaur from the Aptian of Colombia and a review of the Cretaceous plesiosaurs. University of California Publications in Geological Sciences 44(1):1-96
- ^ Carpenter, K. 1999. "Revision of North American elasmosaurs from the Cretaceous of the Western Interior". Paludicola 2(2):148-173.