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From: firstname.lastname@example.org (Graeme Worth)
> Up until a couple of years ago at least, hadrosauridae was a single family.
> Recently I've seen a couple of phylogenies where Hadrosauridae and
> Lambeosauridae were used. What is the concensus (if any) on whether
> hadrosaurids and lambeosaurids are tribes or families, and on what basis?
Jack Horner has proposed that the non-crested and crested hadrosaurs
originated independently from different iguanodonts. If he is correct
this makes the traditionaly Hadrosauridae polyphyletic.
> Second question: Has the ICNZ made a decision yet on the Coelophysis /
> Rioarribasaurus arguement?
I do not see that it needs to. The issue of whether the two are
synonyms is a matter of evidence, not of nomenclatural rules.
The peace of God be with you.