Isotemnidae
Isotemnids were the common large (relatively speaking) notoungulates of the Eocene, and are last recorded in rocks of early Oligocene age. As originally conceived, they do not constitute a natural (monophyletic) group; rather, they include a collection of early-diverging members of the suborder Toxodontia and perhaps one or more other traditionally-recognized families (see Billet 2011). Given […]