Mammalogy: Introduction to Mammals. General ~ 5000 species in ~26 orders >500 new species since 1982; ~ 10 /year monophyletic group derived from therapsids,
Metatheria: Marsupial Mammals First fossils are from Asia (Lauraisa) ~ 125 MYA. Complex biogeography, related to the formation and rupture of Gondwanaland.
Mammals
First evolved in Asia or North America ( ‘ Lauraisa ’ , ~ 125 MYA)
