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Re: Dinosaurs Lived with Protoratites and Primates
About every decade I ask the DML the following question: What is the
current time-stratigraphic status of _Purgatorius_ (found in
screening material from the (?)Hell Creek Fm). Have any new
specimens clarified whether it is a Upper Cretaceous species?
Who cares? :-)
The *Maelestes* paper (cited below) found *Purgatorius*, *Protungulatum*
and *Oxyprimus* to form the sister-group of Placentalia. If this is
anywhere near correct, we can simply forget about *Purgatorius* as long
as we're only interested in the origin of primates. So I have simply
stopped worrying. :-)
Of course, this result has yet to be tested more properly. While big,
the matrix still wasn't big enough (work is being done on this); there
are correlated characters and the like in it (work is being done on
this, too); and all characters were unordered, something that can have a
drastic impact on the topology.
I don't know of any additional specimens, but I don't follow the primary
literature on that kind of animal.
J. R. Wible, G. W. Rougier, M. J. Novacek & R. J. Asher: Cretaceous
eutherians and Laurasian origin for placental mammals near the K/T
boundary, Nature 447, 1003 -- 1006 (21 June 2007)