 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.