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Re: _Requiescat In Pace_
_Spem pinguem_, I'm afraid.
This is, to put it simply, a probably endless philosophical debate about what
we want our classificatory schemes to do.
I for one prefer to see the set of descendants of a particular ancestor as an
entity and to view the advent of subgroups that fly, swim, walk on land, have
backbones, regulate their body temperature, etc., as interesting things that
may *happen to* such an entity.
Others obviously disagree.