Macrauchenia
= Macrauchenia
{c}
An extinct South American mammal whose unusual anatomy made its relationships difficult to resolve. Ancient protein sequences support affinities with the perissodactyl lineage. <Ancient proteins resolve the evolutionary history of Darwin's South American ungulates by Frido Welker and others>[Nature 522, pp. 81–84; collagen sequences from Toxodon and Macrauchenia]{ref}