WAbanico Formation
WAgua de la Piedra Formation
WAllalmeia
WAndrewsornis
WArchimyrmex
WAstraponotus
WBarinasuchus
WBretesuchus
WCarodnia
WCramauchenia
WDidolodus
WEuclastes
WGeste Formation
WHondonadia
WHuitrera Formation
WJagüel Formation
WLaguna Brava Formation
WLaguna del Hunco Formation
WLefipán Formation
WLeontinia
WMadtsoia
WMealla Formation
WMonotrematum
WNecrosuchus
WNiolamia
WNotostylops
WOctodontotherium
WOtodus chubutensis
WPalmoxylon
WParastrapotherium
WPeltephilus
WPhysornis
WProplatyarthrus
WPsilopterus
WPyrotherium
WRhynchippus
WRío Loro Formation
WRoca Formation, Argentina
WScarrittia
WSebecus
WShrew opossum
WSudamerica
WThomashuxleya
WTrigonia
WTrigonostylops
WYacoraite Formation