Convergent evolution with Placental mammals and Marsupial mammals Marsupials are a type of mammal that are thought to all have pouches, such as kangaroos. Although only about half have pouches, the defining factors for are marsupial are reproductive differences. Placental mammals have 3 holes, an anus, urethra, and vagina, while marsupials have an anus, and a cloaca that serves as the exit point for urinary and reproductive uses. The uterus is actually forked, and the babies are born at a very early stage and finish development outside the mother. Placental mammals do much development inside the mother from nourishment from the placenta. Adding some pictures to illustrate these convergent evolutionary relationships would be very interesting. It might spark interest in animals that most students have never heard of. Old World New World/Americas Tasmanian wolf (extinct) = wolf Native Cat = ocelot Flying phalanger = flying squirrel Wombat = groundhog Numbat = Anteater Marsupial mole = Mole Mulgara = Mouse These relationships were identified by George Gaylord Simpson.
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"Convergent evolution with Placental mammals and Marsupial mammals _SANDERS 2011_"Please download to view full document