Allotheria

Allotheria (meaning "other beasts", from the Greek αλλός, allos–other and θήριον, therion–wild animal) is an extinct branch of successful Mesozoic mammals. The most important characteristic was the presence of lower molariform teeth equipped with two longitudinal rows of cusps.[1] Allotheria includes Multituberculata, Gondwanatheria (which may be part of Multituberculata, as the sister group to Cimolodonta),[2][3][4][5] and probably Haramiyida,[6] although some studies show them to be more basal mammaliaforms rather than true mammals, therefore differing from true allotheres significantly.[7][8]

Allotheria Temporal range: Late Jurassic-Miocene, 153–17.5 Ma PreЄ Є O S D C P T J K Pg N Range going as far back as the Late Triassic if Haramiyida is part of this
Skull of Ptilodus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Subclass:	Theriiformes
Infraclass:	†Allotheria Marsh, 1880
Subgroups
†Camptomus †Fractinus ?†Gondwanatheria ?†Haramiyida †Multituberculata

Allotheres also had a narrow pelvis, indicating that they gave birth to tiny helpless young like marsupials or laid eggs and gave milk to feed their young like monotremes do. This is a feature of all non-placental mammals.[9]