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Moropus
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=== Dentition === ''Moropus'' had incisors only on the lower jaw.<ref name=":8">{{Cite journal |last=Coombs |first=Margery Chalifoux |date=1978 |title=A Premaxilla of Moropus elatus Marsh, and Evolution of Chalicotherioid Anterior Dentition |url=https://www.jstor.org/stable/1303796 |journal=Journal of Paleontology |volume=52 |issue=1 |pages=118β121 |jstor=1303796 |issn=0022-3360}}</ref> The cheek teeth (the [[Premolar|premolars]] and [[Molar (tooth)|molars]]) were robust, covered in thick [[Tooth enamel|enamel]], and strongly rooted. The first upper premolar is absent, like other chalicotheres. The second upper premolar was triangular, with the protocone and tritocone ([[Cusp (anatomy)|cusps]]) having fused into a single structure, mostly comprising the former. The third upper premolar is more quadrate in shape, and has one tubercle rather than two. The fourth upper premolar is slightly larger but otherwise very similar.<ref name=":0" /> The lower incisors, of which there were three on each side,<ref name=":0" /> are procumbent (protruding), spatulate, and were separated from the cheek teeth by a long diastema.<ref name=":8" /> The first upper molar is very enlarged, the second is one-fifth longer, and the third is only slightly larger. All three are roughly the same in terms of overall structure. The second lower premolar is highly reduced. Third is molariform (molar-like), in a similar fashion to the brontothere ''[[Megacerops]]''. The first lower molar is considerably wider than the fourth lower premolar, though they are otherwise quite similar, with the exception that the [[Glossary of mammalian dental topography|hypoconid]] is more well-developed and the [[Cingulum (tooth)|cingulum]] is less so. The second lower molar is longer, and has a more prominent cingulum. The third lower molar lacks its third lobe, similar to other chalicotheres.<ref name=":0" />
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