Cardiodon

Cardiodon
Temporal range: Middle Jurassic
Holotype tooth
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
(unranked): ?Turiasauria
Genus: Cardiodon
Owen, 1841
Binomial name
Cardiodon rugulosus
Owen, 1844

Cardiodon (meaning "heart tooth", in reference to the shape) was a 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.

Contents

History and Taxonomy

Richard Owen named the genus for a now-lost tooth found near Bradford-on-Avon, but did not assign it a species name at the time;[1] a few years later, he added the species name.[2] Within a few decades, he and others were viewing it as a possible synonym of his most well-known sauropod genus, Cetiosaurus.[3][4] Richard Lydekker formalized this view in a roundabout way in 1890, by assigning Cetiosaurus oxoniensis to Cardiodon on the basis of teeth from Oxfordshire associated with a skeleton of C. oxoniensis.[5] He also added a second tooth (BMNH R1527) from the Great Oolite near Cirencester, Gloucestershire.[5] More typically, Cardiodon has been assigned to Cetiosaurus, sometimes as a separate species.[6]

In 2003, Paul Upchurch and John Martin, reviewing Cetiosaurus, found that there is little evidence to assign the C. oxoniensis teeth to the skeleton, and the "C. oxoniensis" teeth differ from the Cardiodon teeth (Cardiodon teeth are convex facing the tongue); therefore, they supported Cardiodon being retained as its own genus.[7] Upchurch et al. (2004) repeated this assessment, and found that though the teeth have no known autapomorphies, they are those of an eusauropod.[8] More recently, Royo-Torres et al. (2006), in their description of Turiasaurus, pointed out Cardiodon as a possible relative to their new, giant sauropod.[9]

Paleobiology

As a sauropod, Cardiodon would have been a large, quadrupedal herbivore,[8] but because of the scanty remains, much more cannot be said.

References

  1. ^ Owen, R. (1841). Odontography, Part II. Hippolyte Baillière. 655 p.
  2. ^ Owen, R. (1844). Odontography, Part III. Hippolyte Baillière. 655 p.
  3. ^ Phillips, J. (1871). Geology of Oxford and the Valley of the Thames. Clarendon Press:Oxford, 529 p.
  4. ^ Owen, R. (1875). Monographs of the fossil Reptilia of the Mesozoic formations (part III) (genera Bothriospondylus, Cetiosaurus, Omosaurus). Palaeontographical Society Monographs 29:15-93.
  5. ^ a b Lydekker, R. (1890). Suborder Sauropoda. In: Lydekker, R. (ed.). Catalogue of the Fossil Reptile and Amphibia of the British Museum (Natural History). Part 1. Taylor and Francis:London, p. 131-152.
  6. ^ Steel, R. (1970). Part 14. Saurischia. Handbuch der Paläoherpetologie/Encyclopedia of Paleoherpetology. Part 14. Gustav Fischer Verlag:Stuttgart, p. 1-87.
  7. ^ Upchurch, P.M., and Martin, J. (2003). The anatomy and taxonomy of Cetiosaurus (Saurischia, Sauropoda) from the Middle Jurassic of England. Journal of Vertebrate Paleontology 23(1):208-231.
  8. ^ a b Upchurch, P.M., Barrett, P.M., and Dodson, P. (2004). Sauropoda. In: Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). The Dinosauria (2nd edition). University of California Press:Berkeley, p. 259-322. ISBN 0-520-24209-2
  9. ^ Royo-Torres, R., Cobos, A., and Alcalá, L. (2006). A giant European dinosaur and a new sauropod clade. Science 314:1925-1927.

External links