Although many ungulates have hoofs, this feature does not define the Ungulata.
2.
As ancestors of the artiodactyl section of the Ungulata, we may look to forms more or less closely related to the North American Lower Eocene genus " Mioclaenus ", typifying the family Mioclaenidae.
3.
There is now some dispute as to whether this smaller Ungulata is a cladistic ( evolution-based ) group, or merely a form taxon ) or folk taxon ( similar, but not necessarily related ).
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