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placental mammal
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Introduction References & Edit History Quick Facts & Related Topics
Images
adult capybara with young mammal phylogeny parallel evolution of marsupial and placental mammals Tree of life illustrating the three-domain classification of life-forms
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placental mammal: References & Edit History

Article Contributors

Primary Contributors

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Changed “placenta, which facilitates” to “placenta, a vascular organ that develops during gestation, which facilitates.” Feb 19, 2021
Added a photograph of a capybara (Hydrochoerus hydrochaeris). Jun 27, 2018
Noted that the first placental mammals evolved during the Jurassic Period. Jun 27, 2018
Add new Web site: San Diego State University - Biology Department - Eutheria (Placental Mammals). Aug 17, 2016
Add new Web site: The Natural History Collections of the University of Edinburg - The Placetal or True Mammal. Aug 17, 2016
Text updated noting the emergence of placental mammal in the Cenozoic Era. Feb 08, 2013
Text added that describes Juramaia sinensis, the first known placental mammal. Nov 02, 2011
Add new Web site: University of California Museum of Paleontology - Eutheria. Aug 13, 2010
Added new Web site: University of California, Berkeley: Museum of Paleontology - Eutheria, the Placental Mammals. Jun 26, 2006
Article revised. Mar 10, 2005
Article added to new online database. Jul 20, 1998
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