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Tatankaceratops
''Tatankaceratops'' (meaning "Bison horn face") is a controversial genus of herbivorous ceratopsian dinosaur. It is a small chasmosaurine ceratopsian which lived during the Late Cretaceous period (latest Maastrichtian stage) in what is now South Dakota. It is known from a single partial skull which was collected from the Hell Creek Formation, dating to 66 million years ago. ''Tatankaceratops'' was described by Christopher J. Ott and Peter L. Larson in 2010 and the type species is ''Tatankaceratops sacrisonorum''.〔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.〕
In 2011, Nick Longrich published a paper containing a brief re-evaluation of ''Tatankaceratops''. Longrich suggested that ''Tatankaceratops'' appeared to possess a bizarre mix of characteristics from adult and juvenile ''Triceratops'' specimens. Longrich noted that this animal could represent a dwarf ''Triceratops'' species or simply a ''Triceratops'' specimen with a developmental disorder which caused it to stop growing prematurely. Other paleontologists, including Thomas R. Holtz, Jr., have written that they "strongly suspect" ''Tatankaceratops'' is merely a juvenile specimen of ''Triceratops''.〔Holtz, Thomas R. Jr. (2011) ''Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages,'' (Winter 2010 Appendix. )〕
==See also==
* Timeline of ceratopsian research
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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