There are three quite distinct evolutionary lineages of mammals which have been separated for many millions of years by time and place. The northern-origin (European, Asian, African and North American) eutherian mammals - often called placental mammals - and the southern-origin monotremes (Australasian) and marsupials (Australasian and American).
CITATION STYLE
Mate, K. E., Harris, M. S., & Rodger, J. C. (2000). Fertilization in Monotreme, Marsupial and Eutherian Mammals. In Fertilization in Protozoa and Metazoan Animals (pp. 223–275). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-58301-8_6
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