Tatankaceratops

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Tatankaceratops
Temporal range: Late Maastrichtian, 66  Ma
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Tatankaceratops NT.jpg
Artist's restoration of Tatankaceratops
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Clade: Ornithischia
Clade: Ceratopsia
Family: Ceratopsidae
Subfamily: Chasmosaurinae
Tribe: Triceratopsini
Genus: Tatankaceratops
Ott & Larson, 2010
Species:
T. sacrisonorum
Binomial name
Tatankaceratops sacrisonorum
Ott & Larson, 2010

Tatankaceratops (meaning "bison horned face") is a controversial genus of herbivorous chasmosaurine ceratopsid dinosaur that lived during the Late Cretaceous period (latest Maastrichtian stage, about 66 million years ago) in what is now the Hell Creek Formation, in South Dakota. It is known from a single partial skull, BHI 6226, described by Christopher J. Ott and Peter L. Larson in 2010 as the type species Tatankaceratops sacrisonorum. [1] The specimen is housed at the Black Hills Institute.

Contents

In 2011, Nick Longrich published a paper containing a brief re-evaluation of Tatankaceratops. He suggested that the genus appeared to possess a bizarre mix of characteristics from adult and juvenile Triceratops specimens; the animal's small size and short, slender brow horns are consistent with the animal being a juvenile, but the gnarled bone and fusion of skull elements to one another are typical of old adult ceratopsids. The elongate nose horn meanwhile was characteristic of Triceratops, and specifically, the highly advanced T. prorsus. Longrich also noted that this animal could represent a dwarf species of Triceratops or simply a specimen of the aforementioned genus with a developmental disorder which caused it to stop growing prematurely. [2] Other paleontologists, including Thomas R. Holtz, Jr., have written that they "strongly suspect" Tatankaceratops is merely a juvenile specimen of Triceratops. [3] Authors of subsequent studies involving triceratopsins have not considered it a valid genus. [4]

Systematics

The cladogram below follows Ott and Larson (2010). [1]

Neoceratopsia

See also

References

  1. 1 2 Christopher J. Ott and Peter L. Larson, 2010, "A New, Small Ceratopsian Dinosaur from the Latest Cretaceous Hell Creek Formation, Northwest South Dakota, United States: A Preliminary Description", In: Ryan, M.J., Chinnery-Allgeier, B.J., and Eberth, D.A. (eds.) New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium, Bloomington, Indiana University Press, 656 pp.
  2. Nicholas R. Longrich (2011). "Titanoceratops ouranos, a giant horned dinosaur from the Late Campanian of New Mexico". Cretaceous Research. 32 (3): 264–276. Bibcode:2011CrRes..32..264L. doi:10.1016/j.cretres.2010.12.007.
  3. Holtz, Thomas R. Jr. (2011) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, Winter 2010 Appendix.
  4. Illies, Matthew M. Canoy, and Denver W. Fowler. "Triceratops with a kink: Co-ossification of five distal caudal vertebrae from the Hell Creek Formation of North Dakota." Cretaceous Research, 108 (2020): 104355.