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|subfamily=Ceratopsinae
|subfamily=Ceratopsinae
|supertribe=
|supertribe=
|tribe=Triceratopsini
|tribe=Torosaurusini
|subtribe=
|subtribe=
|genera=
|genera=
==Evolutionary claims==
==Evolutionary claims==
[[File:Cerotopsiansfig037a.jpg|left|200px|thumb|comparison of ''Triceratops'' and ''Torosaurus'' skulls.]]
Paleontologists once believed there were several species of ''Torosaurus'', judging from the large number of [[fossil]] remains, but it is now thought that there were just two, ''T. latus'' and ''T. utahensis''; a third species (''T. gladius'') was investigated and found to have been a is-assigned name applied to ''T. latus''. According to evolution, they are descended from ''Psittacosaurus'', a small bipedal ornithopod whose remains were found in central Asia, and from there the ceratopsian line migrated to North America.<ref>''The Complete Book of Dinosaurs'', by Dougal Dixon, Anness Publishing, 2006</ref>
Paleontologists once believed there were several species of ''Torosaurus'', judging from the large number of [[fossil]] remains, but it is now thought that there were just two, ''T. latus'' and ''T. utahensis''; a third species (''T. gladius'') was investigated and found to have been a is-assigned name applied to ''T. latus''. According to evolution, they are descended from ''Psittacosaurus'', a small bipedal ornithopod whose remains were found in central Asia, and from there the ceratopsian line migrated to North America.<ref>''The Complete Book of Dinosaurs'', by Dougal Dixon, Anness Publishing, 2006</ref>
There has been a recent claim that ''Torosaurus'' may be ''Triceratops'', albeit fully mature. According to the ''Journal of Vertebrate Paleontology''<ref>http://www.cbsnews.com/8301-501465_162-20012471-501465.html</ref><ref>http://www.vertpaleo.org/publications/index.cfm</ref>, scientists theorize that ceratopsian dinosaurs, like all reptiles, continued to grow with age; this growth included changes to the frill which - according to the theory - changed from the deeply-curved solid bone of ''Tricertops'' into the "straight-backed" frill of ''Torosaurus'', a change of which also involved a ''loss'' of bone creating the ''fenestræ'' as a result. According to Dr. Jack Horner, this process involved "metaplastic" bone which caused a change in the shape of the skull as the animal aged, i.e the backward pointing horns of a baby ''Triceratops'' turning into the forward pointing horns of an adult.<ref>http://www.sciencedaily.com/releases/2009/10/091031002314.htm</ref>
There has been a recent claim that ''Torosaurus'' may be ''Triceratops'', albeit fully mature. According to the ''Journal of Vertebrate Paleontology'',<ref>https://www.cbsnews.com/8301-501465_162-20012471-501465.html</ref><ref>http://www.vertpaleo.org/publications/index.cfm</ref> scientists theorize that ceratopsian dinosaurs, like all reptiles, continued to grow with age; this growth included changes to the frill which - according to the theory - changed from the deeply-curved solid bone of ''Tricertops'' into the "straight-backed" frill of ''Torosaurus'', a change of which also involved a ''loss'' of bone creating the ''fenestræ'' as a result. According to Dr. Jack Horner, this process involved "metaplastic" bone which caused a change in the shape of the skull as the animal aged, i.e. the backward pointing horns of a baby ''Triceratops'' turning into the forward pointing horns of an adult.<ref>https://www.sciencedaily.com/releases/2009/10/091031002314.htm</ref>
Creationists hold that ''Torosaurus'', along with other [[dinosaurs]], were created during the sixth day of [[creation week]], and did not survive the post-flood world. In support of the [[great flood]] catastrophe, all known ceratopsian fossils - including their trackways - were found in sedimentary (water-laid) rock.
Creationists hold that ''Torosaurus'', along with other [[dinosaurs]], were created during the sixth day of [[creation week]], and did not survive the post-flood world. In support of the [[great flood]] catastrophe, all known ceratopsian fossils were found in sedimentary (water-laid) rock.
==References==
==References==
{{Reflist}}
[[Category:Dinosaurs]]
[[Category:Dinosaurs]]