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Re: Defining Ornithischia (was Re:)
David Marjanovic wrote:
Philosophical arguments have been made about this point (before
phylogenetic nomenclature came along, at least). One suggestion was to
regard secondary absence as a special kind of presence, so that snakes
can still be regarded as tetrapods...
How to know when your philosophising has gone wrong:
"... absence [is a] kind of presence"