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| Calamosaurus Temporal range: Barremian,
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| Cervical vertebra of Calamosaurus foxi | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Family: | †Compsognathidae |
| Genus: | †Calamosaurus Lydekker, 1891 |
| Species: | †C. foxi
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| Binomial name | |
| †Calamosaurus foxi (Lydekker, 1889 [originally Calamospondylus])
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| Synonyms | |
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Calamosaurus (meaning "reed lizard") was a genus of small theropod dinosaur from the Barremian-age Lower Cretaceous Wessex Formation of the Isle of Wight, England. It is based on two cervical vertebrae (BMNH R901), collected by Reverend William Fox.