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Temporal range: Lower Cretaceous – Recent
House mouse.jpg
House Mouse, Mus musculus
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Clade: Theriiformes
Clade: Trechnotheria
Clade: Cladotheria
Clade: Prototribosphenida
Clade: Zatheria
Clade: Tribosphenida
Subclass: Theria
Parker & Haswell, 1897


Theria is a subclass of mammals. It includes almost all living mammals: the ones that give birth to live young, and not by using a shelled egg.

The Theria are divided into two groups (infraclasses): Metatheria and Eutheria. The surviving Metatheria are the marsupials, and the Eutheria are the placental mammals.