Editing Triceratops (section)

====Other genera as growth stages of ''Triceratops''====
{{Main|Nedoceratops}}
[[File:Nedoceratops skull, PLoS ONE.png|thumb|Comparisons between the skulls of ''Triceratops'' and ''[[Nedoceratops]]'']]
Opinion has varied on the validity of a separate genus for ''Nedoceratops''. Scannella and Horner regarded it as an intermediate growth stage between ''Triceratops'' and ''Torosaurus''.<ref name="ScanHorn2010"/><ref>{{Cite journal | last1 = Scannella | first1 = J. B. | last2 = Horner | first2 = J. R. | editor1-last = Claessens | editor1-first = Leon | title = 'Nedoceratops': An Example of a Transitional Morphology | journal = PLOS ONE | volume = 6 | issue = 12 | pages = e28705 | year = 2011 | doi = 10.1371/journal.pone.0028705| pmid = 22194891 | bibcode = 2011PLoSO...628705S | pmc=3241274| doi-access = free }} {{open access}}</ref> Farke, in his 2011 redescription of the only known skull, concluded that it was an aged individual of its own valid [[taxon]], ''Nedoceratops hatcheri''.<ref name="AF2011">{{cite journal |last=Farke |first=Andrew A. |year=2011 |title= Anatomy and taxonomic status of the chasmosaurine ceratopsid ''Nedoceratops hatcheri'' from the Upper Cretaceous Lance Formation of Wyoming, U.S.A |journal=PLOS ONE |volume=6 |issue=1 |pages=e16196 |doi=10.1371/journal.pone.0016196 |editor1-last=Claessens |editor1-first=Leon |pmid=21283763 |pmc=3024410|bibcode=2011PLoSO...616196F |doi-access=free }} {{open access}}</ref> Longrich and Fields also did not consider it a transition between ''Torosaurus'' and ''Triceratops'', suggesting that the frill holes were pathological.<ref name="bbcTriNotToro"/>

As described above, Scannella had argued in 2010 that ''Nedoceratops'' should be considered a synonym of ''Triceratops''.<ref name="ScanHorn2010"/> Farke (2011) maintained that it represents a valid distinct genus.<ref name="AF2011"/> Longrich agreed with Scannella about ''Nedoceratops'' and made a further suggestion that the recently described ''[[Ojoceratops]]'' was likewise a synonym. The fossils, he argued, are indistinguishable from the ''Triceratops horridus'' specimens that were previously attributed to the defunct species ''Triceratops serratus''.

Longrich observed that another newly described genus, ''[[Tatankaceratops]]'', displayed a strange mix of characteristics already found in adult and juvenile ''Triceratops''. Rather than representing a distinct genus, ''Tatankaceratops'' could as easily represent a dwarf ''Triceratops'' or a ''Triceratops'' individual with a developmental disorder that caused it to stop growing prematurely.<ref name="Longrich">{{Cite journal|first=Nicholas R.|last= Longrich |year=2011 |title=''Titanoceratops ouranous'', a giant horned dinosaur from the Late Campanian of New Mexico |journal=Cretaceous Research |volume=32 |issue= 3|pages= 264–276|doi=10.1016/j.cretres.2010.12.007|bibcode= 2011CrRes..32..264L }}</ref>