Theria

subclass of mammals

Theria is a subclass of mammals. It includes all mammals that give birth to live young without using a shelled egg.

Theria
Temporal range: Lower Cretaceous – Recent
House mouse.jpg
House Mouse, Mus musculus
Scientific classification
Kingdom:
Phylum:
Class:
Subclass:
Theria

Parker & Haswell, 1897
Infraclasses

Metatheria
Eutheria

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.