| Eutheria (including placental mammals)|
Temporal range: Lower Cretaceous – Recent
|House Mouse, Mus musculus|
All living Eutherians are placental mammals. This means that a Eutherian fetus is fed during gestation by a placenta. The offspring of Eutherians are carried in the mother's uterus until fully developed.
Monotremes, for example, lay eggs which protect the young until they are fully developed. Marsupials give birth to young who are not completely developed. Their young then move to a special pouch in the mother's body to continue their development.
Notes and references
- "Eutheria phylogeny". Mikko's Phylogeny Archive. Retrieved 2006-03-08.
- The name Eutheria comes from the Greek words eu- "well-developed" and ther "beast".
- Ji Q; et al. (April 2002). "The earliest known eutherian mammal". Nature 416 (6883): 816–822. doi:10.1038/416816a. PMID 11976675. http://www.nature.com/nature/journal/v416/n6883/full/416816a.html. Retrieved 2008-09-24.
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