Monophyletic Variation
Evolution never permits one thing to "turn into" another, fundamentally different sort of thing. All evolution is just a matter of incremental, superficial changes being slowly compiled atop various tiers of fundamental similarities. Thus every new species, genus or higher taxa that ever evolved was just a modified version of whatever its ancestors were before it.
Those successive levels of similarity represent a taxonomy which will forever encompass all the descendants of that clade through inherited traits, no matter how different they eventually become.
-Aron Ra
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