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Eutheria
(redirected from placental mammal)

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Eutheria

Former division of class Mammalia, comprising all mammals with a placenta.



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Finding a fossil of a placental mammal in the Southern Hemisphere dating back to the early Cretaceous, cast doubt on the Laurasian northern-origin hypothesis, Rich, of the Museum Victoria in Australia, and his colleagues reported in a 1997 Science paper.
this volume examines the evolutionary success of placental mammals (which range from bats to hippos to whales).
Charles Darwin and others have assumed that the diversity of marsupial species in Australia reflects the absence of competition from placental mammals during the early Tertiary period.
 
 
 
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