Theria

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Therian
Fossil range: Middle Cretaceous - Recent
House Mouse, Mus musculus
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 that is divided into two smaller classes: metatheria and eutheria. It includes all mammals that give birth to live young without using a shelled egg.