Trituberculata

Trituberculates
Temporal range: 200–85 Ma

Upper Triassic - Upper Cretaceous

Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Subclass: Theria
Infraclass: Trituberculata
Orders

?Symmetrodonta
Pantotheria
Aegialodontia
Eupantotheria

Trituberculata is an extinct group of animals existing in the fossil record from about 215 – 85 MYA. It contains the ancestors of Placentalia and Marsupialia; all modern mammals except Monotremata are descended from trituberculates. It is named for the three tubercles (cusps) of the molar teeth (not to be confused with Triconodonta). The clade Trituberculata is not always regarded as a valid one, and they probably don't form a monophyletic group. Instead, some of them may be "true" basal mammals (although not always closest related to each other), while others (such as the symmetrodonts) may fall just outside the therian crown group.

See also

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