Taxonomically, they are placed in suborder Ceratomorpha along with the rhino superfamily Rhinocerotoidea.
2.
These animals were initially modest in size and fast moving, having evolved from smaller members of Rhinocerotoidea during the Late Eocene and Early Oligocene.
3.
Fossils of " superfamily Rhinocerotoidea, evolved in the late Eocene : Hyracodontidae, Amynodontidae and Rhinocerotidae, thus creating an explosion of diversity unmatched for a while until environmental changes drastically eliminated several species.
4.
He performed a phylogenetic analysis which placed " Uintaceras ", then amynodontids, then " Paraceratherium ", then " Juxia " and " Forstercooperia ", and finally hyracodontids as the successive outgroups of Rhinocerotidae within Rhinocerotoidea.
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