Theria

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Theria
Temporal range: Lower Cretaceous – Recent
House Mouse, Mus musculus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Subclass: Theria
Parker & Haswell, 1897
Infraclasses

Metatheria
Eutheria

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.