"Placental" redirects here. For the organ interfacing between a placental mammalian mother and a fetus, see Placenta.
Placental mammals
Temporal range: Paleocene-Holocene 66.043–0 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
Possible Late Cretaceous record
Placentals from different orders.
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Class:
Mammalia
Clade:
Eutheria
Infraclass:
Placentalia Owen, 1837
Subgroups
Atlantogenata
Afrotheria
Xenarthra
Boreoeutheria
Euarchontoglires
Laurasiatheria
For extinct groups, see text
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,[1] 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 more closely related to placentals than to marsupials.
^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.
Placental mammals (infraclass Placentalia /plæsənˈteɪliə/) are one of the three extant subdivisions of the class Mammalia, the other two being Monotremata...
right' and θηρίον, thēríon 'beast'; lit. 'true beasts'), also called Pan-Placentalia, is the clade consisting of placental mammals and all therian mammals...
a living crown-group (respectively the Monotremata, Marsupialia and Placentalia) plus any fossil species which are more closely related to that crown-group...
protein characters, as well as the fossil record. Mammal classification Placentalia Exceptional clades whose males lack the usual boreoeutherian scrotum...
clade Placentalia – but only Mammalia and Theria are in the table. Legitimate arguments might arise if the commonly used clades Eutheria and Placentalia were...
Preptotheria is a superorder of placental mammals proposed by McKenna & Bell in their classification of mammals. The Linnean taxonomy of Preptotheria according...
This is a list of mammals of New South Wales. The following tags are used to highlight each species' conservation status as assessed by the International...
However, the chorioallantoic placenta is small compared to those of the Placentalia, and lacks chorionic villi. Bandicoots can reach 11 to 31 in (28 to 79 cm)...
Shelley (2022.) "The phylogeny of Paleocene mammals and the evolution of Placentalia", in "The Society of Vertebrate Paleontology 82nd annual meeting" Rook...
studies recover it as actually a paraphyletic assemblage leading to Placentalia. The leptictids are a characteristic example of the non-specialized placental...
Shelley (2022.) "The phylogeny of Paleocene mammals and the evolution of Placentalia", in "The Society of Vertebrate Paleontology 82nd annual meeting" Thomas...
most recent common ancestor of extant Monotremata, Marsupialia, and Placentalia. Besides Morganucodonta and the crown group mammals, Mammaliaformes includes...
Eukaryota Kingdom: Animalia Phylum: Chordata Class: Mammalia Infraclass: Placentalia Order: †Desmostylia Reinhart 1959 Families and genera Family †Desmostylidae...
and Bayesian methods to the phylogeny and biogeography of Hyaenodonta (Placentalia, Mammalia)". PeerJ. 4: e2639. doi:10.7717/peerj.2639. PMC 5111901. PMID 27867761...
in the subclass Theria; those living today are in the Marsupialia and Placentalia infraclasses. A marsupial has a short gestation period, typically shorter...
not a true placental mammal and it is eutherian found to be close to Placentalia. However, a number of studies consider it to be a placental mammal and...
Goussard, Florent (2015). "Alcidedorbignya inopinata, a basal pantodont (Placentalia, Mammalia) from the early Palaeocene of Bolivia: anatomy, phylogeny and...
data analysis of fossil and living mammals: a Paleogene sister taxon of Placentalia and the antiquity of Marsupialia". Cladistics. 38 (3): 359–373. doi:10...
separate anal and uro-genital openings. The females of the subgroup placentalia have even separate urinary and genital openings. During early development...
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