Placentalia

Placentals; Temporal range: Maastrichtian-present Possible earlier Cretaceous records
	Placentals from different orders.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Clade:	Eutheria
Infraclass:	Placentalia; Owen, 1837
Subgroups
	Atlantogenata; Boreoeutheria; †Palaeoryctida?; †Taeniodonta?; †Procerberidae?; †Alveugena?; †Ambilestes?;
Synonyms
	list of synonyms: Euplacentalia (Koenigswald, 2016) ; Eutheria (Huxley, 1880) ; Monodelphia (Gill, 1872) ; Placentaria (Fleming, 1822) ; Placentata (Turnbull, 1971) ;

Placental mammals (infraclass Placentalia /plæsənˈteɪliə/) are one of the three extant subdivisions of the class Mammalia, the other two being Monotremata and Marsupialia. Placentalia contains the vast majority of extant mammals, which are partly distinguished from monotremes and marsupials in that the fetus is carried in the uterus of its mother to a relatively late stage of development. The name is something of a misnomer, considering that marsupials also nourish their fetuses via a placenta,^[9] though for a relatively briefer period, giving birth to less-developed young, which are then nurtured for a period inside the mother's pouch. Placentalia represents the only living group within Eutheria, which contains all mammals that are more closely related to placentals than they are to marsupials.

^ Archibald, J. David; Zhang, Yue; Harper, Tony; Cifelli, Richard L. (May 6, 2011). "Protungulatum, confirmed Cretaceous occurrence of an otherwise Paleocene eutherian (placental?) mammal" (PDF). Journal of Mammalian Evolution. 18 (3): 153–161. doi:10.1007/s10914-011-9162-1. S2CID 16724836. Archived from the original (PDF) on March 3, 2016. Retrieved April 28, 2013.
^ ^a ^b Cite error: The named reference Bertrand&Shelley2022 was invoked but never defined (see the help page).
^ Cite error: The named reference Shelley2022 was invoked but never defined (see the help page).
^ Wighart von Koenigswald (2016.) "Specialized wear facets and late ontogeny in mammalian dentitions", Historical Biology, 30(1–2), 7–29.
^ T. H. Huxley (1880.) "On the application of the laws of evolution to the arrangement of the Vertebrata, and more particularly of the Mammalia." Proceedings of the Zoological Society, London 43:649-662
^ Gill, T. (1872.) "Arrangement of the Families of Mammals." Smithsonian Misc. Coll. 11 (230), [i]-vi, 1-98.
^ Fleming, J. (1822.) "The philosophy of zoology: Or a general view of the structure, functions and classification of animals." Edinburgh Vol. 2: 1-618
^ Turnbull, W. D. (1971.) "The trinity therians: Their bearing on evolution in marsupials and other therians." In: ed. A. A. Dahlberg "Dental morphology and evolution", Chicago: University of Chicago Press, pp. 151–179.
^ Renfree, M. B. (March 2010). "Review: Marsupials: placental mammals with a difference". Placenta. 31 Supplement: S21–6. doi:10.1016/j.placenta.2009.12.023. PMID 20079531.

Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).

[Archibald2011-1] Archibald, J. David; Zhang, Yue; Harper, Tony; Cifelli, Richard L. (May 6, 2011). "Protungulatum, confirmed Cretaceous occurrence of an otherwise Paleocene eutherian (placental?) mammal" (PDF). Journal of Mammalian Evolution. 18 (3): 153–161. doi:10.1007/s10914-011-9162-1. S2CID 16724836. Archived from the original (PDF) on March 3, 2016. Retrieved April 28, 2013.

[Bertrand&Shelley2022-2] Cite error: The named reference Bertrand&Shelley2022 was invoked but never defined (see the help page).

[Shelley2022-3] Cite error: The named reference Shelley2022 was invoked but never defined (see the help page).

[5] Wighart von Koenigswald (2016.) "Specialized wear facets and late ontogeny in mammalian dentitions", Historical Biology, 30(1–2), 7–29.

[6] T. H. Huxley (1880.) "On the application of the laws of evolution to the arrangement of the Vertebrata, and more particularly of the Mammalia." Proceedings of the Zoological Society, London 43:649-662

[7] Gill, T. (1872.) "Arrangement of the Families of Mammals." Smithsonian Misc. Coll. 11 (230), [i]-vi, 1-98.

[8] Fleming, J. (1822.) "The philosophy of zoology: Or a general view of the structure, functions and classification of animals." Edinburgh Vol. 2: 1-618

[9] Turnbull, W. D. (1971.) "The trinity therians: Their bearing on evolution in marsupials and other therians." In: ed. A. A. Dahlberg "Dental morphology and evolution", Chicago: University of Chicago Press, pp. 151–179.

[Renfree2010-10] Renfree, M. B. (March 2010). "Review: Marsupials: placental mammals with a difference". Placenta. 31 Supplement: S21–6. doi:10.1016/j.placenta.2009.12.023. PMID 20079531.

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