Placental mammal descent

[Polycarp]

@Darwin's Finch

I think you must be thinking of something else here. Pantodonta are members of Ferae, the mammalian clade which includes Carnivora, and are known (exclusively, to my knowledge) from the Paleocene. Perhaps you mean Pantotheria (these days known, I believe, as Dryolestoidea)?

Also, the clade which contains both Metatheria (marsupials) and Eutheria (placentals) is Theria.

You are, of course, correct in both instances, and I did mean Pantotheria. (For obvious reasons, the -donta = a primitive order thing had swiched the two terms in my memory.

My apologies for misinforming.