implacentalia definition

  • noun-plural:
    • A primary division associated with Mammalia, such as the monotremes and marsupials, where no placenta is formed.
  • others:
    • several mammalia constituted because of the marsupials and monotremes, representing the subclasses Didelphia and Ornithodelphia, as collectively contrasted using Placentalia or Monodelphia.
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