Silvisaurus

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Silvisaurus
Fossil range: Early Cretaceous

Extinct (fossil)

Scientific classification

Kingdom:	Animalia
Phylum:	Chordata
Class:	Sauropsida
Superorder:	Dinosauria
Order:	Ornithischia
Suborder:	Thyreophora
Infraorder:	Ankylosauria
Family:	Nodosauridae
Genus:	Silvisaurus Eaton, 1960

Silvisaurus, from the Latin silva "wood" and Greek saurus "lizard", is a nodosaurid ankylosaur from the middle Cretaceous of Kansas.

1 Discovery and species
2 Paleobiology
3 Classification
4 References

[edit] Discovery and species

The holotype was recovered by T. H. Eaton from the University of Kansas from exposures of the Dakota Formation (late Aptian-early Cenomanian) in Kansas, and consists of an incomplete skeleton with skull and sacrum. To date, Silvisaurus includes only the type species, S. condrayi.

Silvisaurus species

S. condrayi (type)

[edit] Paleobiology

Based on these remains, the animal is estimated to have been approximately 4 meters in length. Its skull measures 33 cm in length and is 25 cm wide. The osseous secondary palate is poorly developed in Silvisaurus, the dentary includes at least 25 teeth, the basal tubera of the basiocciptial are bulbous, and each premaxilla holds 8 to 9 teeth. Besides the usual rounded and polygonal osteoderms, Silvisaurus may have also sported bony spines on its shoulders and tail.

[edit] Classification

This taxon represents a relatively primitive nodosaurid, and Vickaryous et. al. (2004) have stated that "Sauropelta edwardsorum, Silvisaurus condrayi, and Pawpawsaurus campbelli form a basal polytomy nested deep to Cedarpelta."

[edit] References

Eaton, T. H., Jr. 1960. A new armored dinosaur from the Cretaceous of Kansas. The University of Kansas Paleontological Contributions: Vertebrata 8:1-24.
Vickaryous, Maryanska, and Weishampel 2004. Chapter Seventeen: Ankylosauria. in The Dinosauria (2nd edition), Weishampel, D. B., Dodson, P., and Osmólska, H., editors. University of California Press.