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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"


John Conway
Palaeontography: http://palaeo.jconway.co.uk