Tsagantegia

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Tsagantegia
Temporal range: Late Cretaceous, 90Ma
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Family: Ankylosauridae
Subfamily: Ankylosaurinae
Genus: Tsagantegia
Tumanova, 1993
Species: † T. longicranialis
Binomial name
Tsagantegia longicranialis
Tumanova, 1993

Tsagantegia (/ˌsɑːɡɑːnˈtɡiə/; meaning "of Tsagan-Teg"; Tumanova, 1993) 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 Bayan Shireh 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.[1]

Description[edit]

The skull measures 30 centimetres (12 in) in length, with a maximum width of 25 centimetres (9.8 in). Vickaryous et al. (2004)[2] 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[edit]

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.[2]

References[edit]

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