Mammalia - Litopterna

Parent taxon: Meridiungulata according to M. C. McKenna 1975

Sister taxa: Astrapotheria, Notoungulata, Pyrotheria, Trigonostylopoidea, Xenungulata

Subtaxa: Adianthidae, Macraucheniidae, Mesorhinidae, Notohippidae, Notonychopidae, Proterotheriidae, Protolipternidae

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Ecology: scansorial herbivore