Trituberculata

Trituberculata

Taxobox
name = Trituberculates
fossil_range = fossil range|215|85 Upper Triassic - Upper Cretaceous
regnum = Animalia
phylum = Chordata
classis = Mammalia
subclassis = Theria
infraclassis = Trituberculata
subdivision_ranks = Orders
subdivision = ?Symmetrodonta
Pantotheria
Aegialodontia
Eupanthotheria

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) should rather be treated as advanced mammaliaforms just outside Mammalia proper.

ee also

*Eotheria
*Multituberculata


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