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Moropus
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=== Invalid or reassigned species === In 1892, Barbour came into possession of a partial mammal skeleton from the [[Agate Fossil Beds National Monument]].<ref>{{Cite journal |last=Cockerell |first=T. D. A. |date=1923 |title=Fossil Mammals at the Colorado Museum of Natural History |url=https://www.jstor.org/stable/3693057 |journal=The Scientific Monthly |volume=17 |issue=3 |pages=271–277 |jstor=3693057 |issn=0096-3771}}</ref> He assigned the specimen to ''Moropus'', and named a new species, ''M. cooki'' (after Harold Cook, who discovered it) based on it. However, Peterson and Holland considered ''M. cooki'' a junior synonym of ''M. elatus''.<ref name=":0" /> In 1907, Holland named ''M. petersoni'', also from the Agate Fossil Beds, after Peterson.<ref>{{Cite journal |last=Holland |first=W. J. |date=1908 |title=A New Species of the Genus Moropus |url=https://www.jstor.org/stable/1634948 |journal=Science |volume=28 |issue=727 |pages=809–810 |doi=10.1126/science.28.727.809 |jstor=1634948 |pmid=17780444 |bibcode=1908Sci....28..809H |issn=0036-8075}}</ref> Later, in 1975, Margery Chalifoux Coombs suggested that ''M. petersoni'' was instead the same taxon as ''M. elatus'', and that its differences could be explained through [[sexual dimorphism]] {{See below|[[#Sexual dimorphism|below]]}}.<ref name=":3">{{Cite journal |last=Coombs |first=Margery Chalifoux |date=1975 |title=Sexual Dimorphism in Chalicotheres (Mammalia, Perissodactyla) |url=https://www.jstor.org/stable/2412697 |journal=Systematic Zoology |volume=24 |issue=1 |pages=55–62 |doi=10.2307/2412697 |jstor=2412697 |issn=0039-7989|url-access=subscription }}</ref> In 1935, Soviet palaeontologist K.K. Flerov named an Asian species of ''Moropus'', "M." ''betpakdalensis'' from Kazakhstan.<ref>{{Cite journal |last=Flerov |first=K. K. |date=1938 |title=Remains of Ungulata from Betpak–dala |journal=C. R. Acad. Sci. |volume=21 |pages=94–96}}</ref> This taxon has since been reassigned to a genus of its own, ''[[Borissiakia]]''.<ref name="butler1965">{{Cite journal |last=Butler |first=Percy Milton |author-link=Percy M. Butler |date=1965 |title=Fossil mammals of Africa No. 18: East African Miocene and Pleistocene chalicotheres |url=https://www.biodiversitylibrary.org/part/83495 |journal=Bulletin of the British Museum (Natural History) Geology |volume=10 |pages=163–237}}</ref> Another purported Asian ''Moropus'', "M''.''" ''huangheensis'', has also been reassigned to ''Borissiakia''.<ref>{{Cite journal |last1=Li |first1=Zhaoyu |last2=Mörs |first2=Thomas |last3=Zhang |first3=Yunxiang |last4=Xie |first4=Kun |last5=Li |first5=Yongxiang |date=2022-12-01 |title=New Material of Schizotheriine Chalicothere (Perissodactyla, Chalicotheriidae) from the Xianshuihe Formation (Early Miocene) of Lanzhou Basin, Northwest China |url=https://link.springer.com/article/10.1007/s10914-022-09619-3 |journal=Journal of Mammalian Evolution |language=en |volume=29 |issue=4 |pages=877–889 |doi=10.1007/s10914-022-09619-3 |issn=1573-7055}}</ref>
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