[CarolinaGuitarman]

"I wonder if the 11 million year old "extinct" Laotian rock rat, recently found in a meat market and other places, has any "plesiomorphic" features."

That species is actually not 11 million years old; it's the family it belongs to that was thought to have died out 11 million years ago. That was incorrect; obviously some members of that rodent family did survive.

[KMJames]

That species is actually not 11 million years old;...

How many million years old is it then?...Would you believe 10 million?...or perhaps 9 million?...Can't they extrapolate some date of divergence from the ancestor - they seem to do this all the time with human and ape fossils?

...it's the family it belongs to that was thought to have died out 11 million years ago...

So, if they are emphasizing this as a different species from the extinct "ancestral" family, then they must think this particular type of rock rat has undergone some of that thar' mackro evolooshunn.