The South American notoungulates; As a whole, meridiungulates are said to have evolved from animals like " Hyopsodus ".
2.
A study of four mammalian genera : " Hyopsodus ", " Pelycodus ", " Haplomylus " ( three from the Eocene ), and " Plesiadapis " ( from the Paleocene ) found that through a large number of stratigraphic layers and specimen sampling each group exhibited, " gradual phyletic evolution, overall size increase, iterative evolution of small species, and character divergence following the origin of each new lineage ".
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