MesozoicMultituberculataMonotremataMarsupialia
Primitive insectivorous placentalsEdentataGliresPholidotaLagomorphaRodentiaMacroscelideaPrimatesScandentiaDermopteraChiropteraLipotyphlaArchontaFeraeUngulataCreodontaCarnivoraArtiodactylaCetaceaTubulidentataPerissodactylaHyracoideaProboscideaEmbrithopodaDesmostyliaSireniaCenozoic140 120 100 80 60 40 20 0MesozoicMuultituberculaataMonotremataMarsupialia
Primittive insectivorous placentalsEdentataGliresPholidotaLagomorphaRodentiaMacroscelideaPrimatesScandentiaDermopteraChiropteraLipotyphlaArchontaFeraeUngulataCreodontaaCarnivoraArtiodactylaCetaceaTubulidentataPerissodactylaHyracoideaProboscideaEmbrithopodaDesmostyliaSireniaCenozoic120 100 80 60 40 20 00PrimittFIGURE 13.12. The evolutionary radiation of
placental mammals, modified from Novacek
(1994). (Drawing by Carl Buell)