WAcamptogenotia
WAceratheriinae
WAmebelodontidae
WBear dog
WBorophaginae
WBramatherium
WCallistochiton
WChalicotherioidea
WChilotherium
WClavilithes
WDesmocyon
WDiscinisca
WDorcatherium
WHippotherium
WHorned gopher
WIschnochiton
WKentriodontidae
WLibralces
WMerychyus
WMetailurus
WNuralagus
WNyanzachoerus
WObdurodon
WOdobenocetops
WOncorhynchus rastrosus
WOtodontidae
WParapontoporia
WPholadomya
WPliohyrax
WPliopithecus
WSparassodonta
WStupendemys
WSveltia
WThylacosmilidae
WTrigodon
WUrsus minimus