[Skidoo]

Speciation, for purposes of discussion, is where one internally fertile group develops into another.

There is no applicable instance of this phenomenon in the data. In fact, it's unlikely even from the perspective of logic. How can there be descent of any sort through a discontinuity in fertility? The usual answer is that it happens gradually, but that solves nothing. If offspring that are infertile with the parent are produced at any generational juncture, how could they be fertile with each other? If the drift is cumulative so that the potential infertility is manifested only over many generations, then how is fertility within the group maintained? If it is maintained through the propagation of each mutation so that all members have it, how does the presence of the same mutation in both prospective partners negate its detrimental effect? If it doesn't, and the mutation is counteracted by being selected against, how is it the line doesn't go extinct considering the overwhelmingly predominant effect of random change per se is to decrease function?

If you don't think this matters, then maybe you can explain how "evolution" could proceed otherwise.