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250px-Left ilium of Cedrorestes
Cedrorestes

Temporal range: Early Cretaceous, BarremianPreЄ

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Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: †Ornithischia
Suborder: †Ornithopoda
Clade: †Ankylopollexia
Clade: †Styracosterna
Genus: Cedrorestes

Gilpin et al., 2007

Species: C. crichtoni
Binomial name
Cedrorestes crichtoni

Gilpin et al., 2007

Cedrorestes is a genus of iguanodontiandinosaur from the Early Cretaceous of Utah. It is based on an incomplete skeleton which was found in the Barremian-age Yellow Cat Member of the Cedar Mountain Formation.

Discovery and history Edit

Cedrorestes is based on DMNH 47994, a partial skeleton including rib fragments, a sacrum, the left ilium and a portion of the right, a right thighbone, the right third metatarsal, and fragments of ossifiedtendons. These remains were recovered from near the top of the Yellow Cat Member of the Cedar Mountain Formation, in east-central Utah. They were found scattered in a calcareous mudstone, and showed evidence of pre-burial damage, from weathering or trampling.[1]

This genus can be told apart from other iguanodontian ornithopods by its combination of a tall ilium, as is present in Iguanodon-like ornithopods, with a large lateral bony process above and behind the acetabulum and joint surface for the ischium, as is seen in hadrosaurids. David Gilpin and his coauthors, who described the specimen, noted that the lateral process has been considered diagnostic for hadrosaurids,[1][2] and interpreted the combination of anatomical characteristics in Cedrorestes as evidence that the genus was close to the division between hadrosaurids and iguanodontids. They placed their new genus in Hadrosauridae, as the earliest known hadrosaurid.[1]

The etymology of the generic name is, from Latin, cedrus (cedr-); "cedar" + Greek oros-; "mountain", after the Cedar Mountain formation, where the fossil was found + Greek suffix ending -etes; "dweller". The specific epithet crichtoni is after Michael Crichton, author of Jurassic Park and The Lost World. Other dinosaurs named after M.Crichton is Crichtonsaurus and Crichtonpelta[1]

Paleoecology and paleobiology Edit

The Yellow Cat Member of the Cedar Mountain Formation is known for its dinosaurs, including the small coelurosauriantheropod Nedcolbertia, the dromaeosauridUtahraptor, brachiosaurid sauropodCedarosaurus, and heavily armored ankylosaurid Gastonia.[3]

Whether a basal hadrosaurid or derived non-hadrosaurid iguanodontian, Cedrorestes would have been a large herbivore capable of moving both bipedally or on all fours.[4][5] The structure of its hip indicates that it had hadrosaurid-like leg muscles, but the functional significance of the changes in leg muscles from the iguanodontian layout to the hadrosaurid layout, and resulting differences in movement (if any), are not yet understood.[1] Detailed interpretations of the paleobiology of Cedrorestes must wait for the discovery of more extensive remains.

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