[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]


> During the Lancian (just before the K-T boundary) there began a major
> of speciesization in the "condylartha," the survivors of which evolved
> the various ungulata we know today.
> In other words, during the Cretaceous, the Ungulata went from a single
> species to small number of closely related species. They evolved into many
> directions, and those survivors are the crown groups we know and love

Where have all these LK (crown group) placentals been found, and are they
still regarded as such today? I mean,
http://www.dinosauria.com/jdp/misc/hellcreek.html lists 11 multituberculate
species, 12 metatherian species and 8 eutherian species, the latter in the
genera *Gypsonictops*, *Cimolestes* and *Batodon*. *Cimolestes* is, AFAIK,
outside the crown group; where are the others placed?

To add some dinosaur relevance :-) ... at the base of the major placental
clades according to molecular phylogeny, and at that of Marsupialia, there
are always shrewlike insectivores/omnivores/scavengers, as
http://www.cmnh.org/fun/dinosaur-archive/2001Feb/msg00434.html has noted --
those that have the most chances to survive an impact.