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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a terrestrial division (realm) in zoogeography that is coextensive with the Neotropical region. The fauna of the Neogaean is characterized by the absence of monotremes, by few marsupials, and by the prevalence of placental mammals.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.