1. This mammal species is known only from this fragmentary tribosphenic teeth. 2. The tribosphenic design appears primitively in all groups of mammals. 3. The new mammal has " pseudo-tribosphenic " teeth. 4. From the primitive tribosphenic tooth, molars have diversified into several unique morphologies. 5. Metatherians belong to a subgroup of the northern tribosphenic mammal clade or Boreosphenida. 6. Another fragmentary tooth, UA 8699, is recognizable as a tribosphenic lower molar. 7. These mammals possessed tritubercular lower molars and these were not tribosphenic and were quite primitive. 8. The tribosphenic tooth is found in insectivores and young platypuses ( adults have no teeth ). 9. Early creodonts ( both oxyaenids and hyaenodontids ) displayed the tribosphenic molars common for basal therians. 10. It is believed to be 167 million years old, or 25 million years older than all previous tribosphenic fossils.
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