| 1. | The most recent phylogenetic studies recover it as actually a paraphyletic assemblage leading to Placentalia.
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| 2. | The older system was essentially the same, but used the names Monotremata, Marsupialia, and Placentalia.
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| 3. | Viviparous mammals are in the subclass Theria; those living today are in the Marsupialia and Placentalia infraclasses.
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| 4. | The date of divergence of " Protungulatum " and " Placentalia " is approximately 75 Ma.
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| 5. | The Prototheria-Metatheria-Eutheria system has a number of miniscule differences from the Monotremata-Marsupialia-Placentalia system.
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| 6. | Eutheria was named in 1872 by Theodore Gill; in 1880 Thomas Henry Huxley defined it to encompass a more broadly defined group than Placentalia.
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| 7. | The two infraclasses of Theria in the Prototheria-Theria system may also be " Marsupialia " and " Placentalia ".
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| 8. | Huxley s system, in which The three subclasses are Prototheria, Metatheria, and Eutheria, rather than Monotremata, Marsupialia, and Placentalia.
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| 9. | The function of this organ is probably to transfer nutrients from the mother; however the structure is small, compared to those of the Placentalia.
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| 10. | Either because the last common ancestor of Placentalia was nocturnal and had no use for good color vision, or simply because it just so happened.
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