| Cardiodon Temporal range: late Bathonian
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| Holotype tooth seen from two different angles (2–3), another tooth (4) and a close-up of the surface of the tooth (5) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha |
| Clade: | †Sauropoda |
| Clade: | †Turiasauria |
| Genus: | †Cardiodon Owen, 1841 |
| Species: | †C. rugulosus
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| Binomial name | |
| †Cardiodon rugulosus Owen, 1844
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| Synonyms | |
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Cardiodon (meaning "heart tooth", in reference to the shape) was a herbivorous genus of sauropod dinosaur, based on a tooth from the late Bathonian-age Middle Jurassic Forest Marble Formation of Wiltshire, England. Historically, it is very obscure and usually referred to Cetiosaurus, but recent analyses suggest that it is a distinct genus, and possibly related to Turiasaurus. Cardiodon was the first sauropod genus named.[1]
- ^ Taylor, Michael P., (2010), "Sauropod dinosaur research: a historical review", pp. 361–386 in: Richard T. J. Moody, Eric Buffetaut, Darren Naish and David M. Martill (eds.), Dinosaurs and Other Extinct Saurians: a Historical Perspective. Geological Society of London, Special Publication 343