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Placental mammals (infraclass Placentalia / p l æ s ə n ˈ t eɪ l i ə /) 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 ...
The class Mammalia is divided into two subclasses based on reproductive techniques: egg-laying mammals (yinotherians or monotremes - see also Australosphenida), and mammals which give live birth ().
The class Mammalia is divided into two subclasses based on reproductive techniques: monotremes, which lay eggs, and therians, mammals which give live birth, which has two infraclasses: marsupials/metatherians and placentals/eutherians.
Eutheria (from Greek εὐ-, eú-'good, right' and θηρίον, thēríon 'beast'; lit. ' true beasts '), also called Pan-Placentalia, is the clade consisting of placentals and all therian mammals that are more closely related to placentals than to marsupials.
Articles relating to the Placentalia, one of the three extant subdivisions of the class of animals Mammalia; the other two are Monotremata and Marsupialia.The placentals are partly distinguished from other mammals in that the fetus is carried in the uterus of its mother to a relatively late stage of development.
Boreoeutheria (/ b oʊ ˌ r iː oʊ j uː ˈ θ ɛr i ə /, "northern true beasts") is a magnorder of placental mammals that groups together superorders Euarchontoglires and Laurasiatheria.
Exafroplacentalia or Notolegia is a clade of placental mammals proposed in 2001 on the basis of molecular research. [1] [2] [3]Exafroplacentalia places Xenarthra as a sister group to the Boreoeutheria (comprising Laurasiatheria and Euarchontoglires), [4] thus making Afrotheria a primitive group of placental mammals (the group name roughly means "those which are not African placentals").
Epitherians comprise all the placental mammals except the Xenarthra.They are primarily characterized by having a stirrup-shaped stapes in the middle ear, which allows for passage of a blood vessel.