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Temporal range: Late Cretaceous
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Sauropodomorpha
Clade: Sauropoda
Clade: Titanosauria
Genus: Clasmodosaurus
Ameghino, 1898

C. spatula Ameghino, 1898

Clasmodosaurus was a genus of dinosaur, probably a sauropod. It lived during the Late Cretaceous in what is now Argentina, it is known only from three fossilized teeth, and is therefore a tooth taxon. It is a nomen dubium.[1]

The type species, Clasmodosaurus spatula, was described by Argentine paleontologist Florentino Ameghino in 1898. For a long time, these teeth were thought to belong to a theropod; the teeth of Clasmodosaurus spatula were polygonal in cross section rather than round, an unusual trait also found in the titanosaur Bonitasaura salgadoi.[2]


Clasmodosaurus was named by Florentino Ameghino in 1898, but remained largely unknown for decades after its discovery,[3] it was originally considered a sauropod, but Friedrich von Huene suggested that it could be a coelurosaur or synonymous with Loncosaurus, which he considered to be a carnosaur.[4] Like Loncosaurus, its taxonomy remained unclear with it regarded as a theropod on the rare occasions it was mentioned.[4] However, Jaime Powell suggested that it was a dubious genus of sauropod in 1986, an identification which has been accepted since. Like diplodocoids and titanosaurs, it had narrow tooth crowns, and it is typically regarded as a titanosaur like most Late Cretaceous sauropods.[4]


  1. ^ Upchurch, P.; Barrett, P. M.; Dodson, P. (2004). "Sauropoda". In Weishampel, D. B.; Dodson, P.; Osmólska, H. (eds.). The Dinosauria (2nd ed.). pp. 259–322. ISBN 978-0520254084.
  2. ^ Gallina, P. A.; Apesteguía, S. (2011). "Cranial anatomy and phylogenetic position of the titanosaurian sauropod Bonitasaura salgadoi". Acta Palaeontologica Polonica. 56 (1): 45–60. doi:10.4202/app.2010.0011.
  3. ^ von Huene F. 1929. Los Saurisquios y ornithisquios del Cretaceo Argentino. Anales del Museo de la Plata.
  4. ^ a b c Powell JE. 2003. Revision of South American titanosaurid dinosaurs: palaeobiological, palaeobiogeographical and phylogenetic aspects. Records of the Queen Victoria Museum 111:1–173.

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