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Eutheria, the placental mammals, is a subclass of the Mammalia except those classified in the Monotremata and Metatheria (marsupials) and in which the fetus is nourished in the womb attached to a highly organized placenta until a comparatively late stage in its development. Eutheria are included in the orders: Insectivora, Rodentia, Edentata (see edentate), Lagomorpha, Carnivora, Artiodactyla, Perissodactyla, Cetacea (see cetacean), Hyracoidea, Proboscidia, Sirenia, Chiroptera, and primates.

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