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whatever subfamily it ends up in *must* be labelled Ceratopsinae |
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In 1889 Marsh named a second species of ''Ceratops'': ''Ceratops horridus''.<ref>{{cite journal | last1 = Marsh | first1 = O.C. | year = 1889 | title = Notice of new American Dinosauria | url = | journal = American Journal of Science | volume = 37 | issue = | pages = 331–336 }}</ref> This would almost immediately in a subsequent article be renamed into ''[[Triceratops]] horridus''. ''Ceratops horridus'' is thus the type species of ''Triceratops''. In the same article Marsh renamed ''Bison alticornis'', his misidentification of ceratopid material for a giant [[Bovidae|bovid]], into ''Ceratops alticornis''.<ref>{{cite journal | last1 = Marsh | first1 = O.C. | year = 1889 | title = Notice of gigantic horned Dinosauria from the Cretaceous | url = | journal = American Journal of Science | volume = 38 | issue = | pages = 173–175 }}</ref> In 1890 Marsh renamed ''Hadrosaurus paucidens'' into ''Ceratops paucidens'';<ref>{{cite journal | last1 = Marsh | first1 = O.C. | year = 1890 | title = Description of new dinosaurian reptiles | url = | journal = The American Journal of Science |series=Series 3 | volume = 39 | issue = | pages = 81–86 }}</ref> but the original assessment of Hatcher that this represented [[Hadrosauridae|hadrosaurid]] material is probably correct.<ref name="Lull1907"/>
In 1905 Hatcher renamed three ''Monoclonius'' species into ''Ceratops'' species: ''Monoclonius recurvicornis'' Cope 1889 became ''Ceratops recurvicornis''; ''Monoclonius belli'' Lambe 1902 was made ''Ceratops belli'' and ''Monoclonius canadensis'' Lambe 1902 was renamed ''Ceratops canadensis''.<ref>{{cite journal | last1 = Stanton | first1 = T.W. | last2 = Hatcher | first2 = J.B. | year = 1905 | title = Geology and paleontology of the Judith River Beds | url = | journal = United States Geological Survey Bulletin | volume = 257 | issue = | pages = 1–174 }}</ref> ''C. canadensis'' later was made the
In 2005, remarkably well preserved cranial and postcranial elements of a [[Judith River Formation|Judithian]] ceratopsian were discovered in [[Fergus County, Montana]]. Nicknamed "Judith", preliminary examination suggested a close affinity with ''C. montanus''. The locality has been determined to be on or in close proximity to the stratigraphic layer of ''C. montanus'', and not too many miles away.<ref name=judiththedinosaur>"[http://www.judiththedinosaur.com Judith the Dinosaur]". Accessed 17-AUG-2013.</ref> In 2016, the new animal was named ''[[Spiclypeus]]'', and the authors stated that it may be identical to ''Ceratops'', which they considered a ''nomen dubium'', or a growth stage of ''Albertaceratops''.<ref>{{cite journal|last1=Mallon|first1=Jordan C.|last2=Ott|first2=Christopher J.|last3=Larson|first3=Peter L.|last4=Iuliano|first4=Edward M.|last5=Evans|first5=David C.|last6=Evans|first6=Alistair R.|title=''Spiclypeus shipporum'' gen. et sp. nov., a Boldly Audacious New Chasmosaurine Ceratopsid (Dinosauria: Ornithischia) from the Judith River Formation (Upper Cretaceous: Campanian) of Montana, USA|journal=PLOS ONE|date=2016|volume=11|issue=5|pages=e0154218|doi=10.1371/journal.pone.0154218|pmid=27191389|pmc=4871577}}</ref>
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