Of Tarbosaurs and tabbies

[zone65@bigpond.com]

I should know this already, but when did the lion and tiger diverge? 
Would it be accurate to say they are each branches of the same species 
on the path to distinct speciation? If so, do they therefore represent 
transitional forms, of the type so coveted in the fossil record?

Peter Markmann (scrambling to get back on topic)

> As I mentioned in some emails recently, the ability to interbreed with
> relatives is a primitive trait.  Thus, the cornerstone of the BSC
> (Biological Species Concept) is based on plesiomorphy (i.e., the lack 
> of
> evolutionary change)!!
>
> So don't let the fact that all of us learn the BSC as the "real" 
> species
> definition get in the way of the fact that it doesn't really work.
>
>
>             Thomas R. Holtz, Jr.