Theria
From Wikipedia, the free encyclopedia
| Theria Fossil range: Lower Cretaceous – Recent |
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| House Mouse, Mus musculus | |||||||||
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Theria is a subclass of mammals. It includes all mammals that give birth to live young without using a shelled egg.
The theria are divided into two smaller groups (infraclasses): metatheria and eutheria. The sole surviving metatheria are the marsupials, and the eutheria are the placental mammals.
Look up Theria in Wikispecies, a directory of species
