---

Well, it's always good to remember that the concept of species exist only in the minds of men: nature knows of no such divisions :) None of the species definitions make much sense in a real world. This is perhaps best demonstrated in insect genera with 'normal' sexually reproducing species and parthenogenetic species. Sexual isolation is obviously a moot point the the latter - yet the appear to form distinct 'species' just like the hornier congeners ;)

Species - and taxonomy in general - is just a simplistic tagging system for keeping track of the diversity of life (whatever that means!)

...ah, I have apparently drifted slightly off-topic. And it's not even friday yet :o