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Re: Youngest dino remains
On Fri, 19 Mar 1999 Dinogeorge@aol.com wrote:
> Unfortunately, they're not equivalent. There are no >extant< groups between
> birds and crocodiles, but there are many >extant< groups that would fall into
> this definition of bats that are manifestly not bats. Extant groups aside,
> there is no real objection to redefining bats this way.
Who cares whether the groups are extant or not? There are a great many
known fossil taxa (_Triceratops_, _Gastonia_, _Dicraeosaurus_, etc.) that
are "manifestly not birds", yet fall inside your definition of birds.
As I have mentioned before, BCF is simply _speculation_ on the physical
form and lifestyle of some undiscovered common ancestors--the very same
common ancestors uncovered by cladistics and other phylogenetic methods.