A Middle Jurassic mammal from Madagascar

@article{Flynn1999AMJ,
  title={A Middle Jurassic mammal from Madagascar},
  author={John J. Flynn and J. Michael Parrish and Berthe Rakotosamimanana and William F Simpson and Andr{\'e} R. Wyss},
  journal={Nature},
  year={1999},
  volume={401},
  pages={57-60}
}
The lower molars of tribosphenic mammals (marsupials, placentals and their extinct allies) are marked, primitively, by a basined heel (talonid) acting as the mortar to the pestle of a large inner cusp (protocone) on the opposing upper teeth. Here we report the earliest tribosphenic mammal found so far, three lower teeth in a jaw fragment from Middle Jurassic (Bathonian, ∼167 ± 2 Myr) sediments of northwest Madagascar. This specimen extends the stratigraphic range of the Tribosphenida by some 25… 
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