Hell I'm not even a neodarwinian and an evolutionary species concept guy so I think 1) adaptations are rare and even harder to prove and 2) species may not even exist (or perhaps they are like pornography, I can't really define them but will know it when I see it!).
Vinny
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“There is a grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that whilst this planet has gone on cycling according to the fixed laws of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.” -C. Darwin, 1859
