Tsagantegia

Tsagantegia

Taxobox
name = "Tsagantegia"
fossil_range = Late Cretaceous
regnum = Animalia
phylum = Chordata
classis = Sauropsida
superordo = Dinosauria
ordo = Ornithischia
subordo = Thyreophora
infraordo = Ankylosauria
familia = Ankylosauridae
genus = "Tsagantegia"
genus_authority=Tumanova, 1993
subdivision_ranks=Species
subdivision=
*"T. longicranialis" Tumanova, 1993 (type)

"Tsagantegia" (Tumanova, 1993; etymology = "of Tsagan-Teg") is a genus of medium-sized ankylosaurid dinosaur from the Upper Cretaceous Mongolia, during the Cenomanian stage.

The holotype specimen (GI SPS N 700/17), a complete skull, was recovered from the Baynshiree Svita Formation (Cenomanian-Santonian), at the Tsagan-Teg ("White Mountain") locality, Dzun-Bayan, in the southeastern Gobi Desert, Mongolia. At this time, the genus is monotypic, including only the type species, "T. longicranialis".

Description

The skull measures 30 centimeters (12 in) in length, with a maximum width of 25 centimeters (10 in). Vickaryous "et al". (2004) note that "Unlike other ankylosaurs, in "Tsagantegia" the cranial ornamentation is not subdivided into a mosaic of polygons but is amorphous." The quadratojugal and squamosal bosses are poorly developed, in contrast with other ankylosaurs. The skull was long and flat, smooth and bearing small horns.

Phylogenetics

In their cladistic analysis of the Ankylosauria, Vickaryous et al. (2004) placed "Tsagantegia" at the base of the Ankylosauridae, as the sister group to all other ankylosaurids.

References

*Tumanova, T. A. 1993. A new armored dinosaur from southeastern Gobi. Paleontological Journal 27(2):119-125.
*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.


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