WAmerhippus
WArctotherium
WCanoa Formation
WCatonyx
WChapalmalania
WCuvieronius
WDoedicurus
WGlossotherium
WGryposuchus
WHemiauchenia
WHolmesina
WJama Formation
WJosephoartigasia monesi
WMacrauchenia
WMixotoxodon
WNeolicaphrium
WNothrotherium
WPanochthus
WPisco Formation
WPlatygonus
WThalassocnus
WThylamys
WThylophorops
WToxodon
WWare Formation