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Re: No Cretaceous placental mammals?
The new eutherian phylogeny, produced with the inclusion of _Maelestes
gobiensis_ of the Djadokhta, and using a considerable spread
of Cretaceous eutherians and Paleogene mammals finds:
* monophyletic Euarchontaglires, Laurasiatheria, Xenarthra, and Afrotheria
(the latter two as sister taxa, and together the sister
taxon to laurasiatheres)
Wow! As soon as one takes a serious look at the morphological data, most of
the molecular topology comes out! I'm impressed. :-)
* the sister group to Placentalia is a clade comprised of _Purgatorius_,
_Protungulatum_, and _Oxyprimus_
* more distal outgroups are lepticids, zalambdalestids, _Deccanolestes_, a
Asioryctotheria + Cimolestida clade (the latter includes
_Maelestes_), an _Eozhelestes_ + _Paranyctoides_ clade, zhelestids,
_Montanaletes_, _Bobolestes_, and an (_Eomaia_ +
_Prokennalestes_)+ _Murtoilestes_ clade
So, judging from the epipubes retained by the zalambdalestids, the placental
mode of reproduction is limited to Placentalia +
*Purgatorius*-*Protungulatum*-*Oxyprimus* + Leptictidae?
Interesting position for the cimolestidans. That probably fits the fact
better that some retain 5 premolars.