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Temporal range: JurassicOligocene
Skull of Ptilodus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Superorder: Allotheria

Allotheria is an exinct subclass or superorder of mammals. It is a relative of the prototheria and theria.

The allotheres was a branch of successful Mesozoic mammals. The most important characteristic was the presence of lower molariform teeth equipped with two longitudinal rows of cusps.

Allotheres also had a narrow pelvis, indicating that they gave birth to tiny helpless young like marsupials do.