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From: John Schneiderman <email@example.com>
> Has anyone worked out the systematics for ceratopsians?
Some work has been done - see "Dinosaur Systematics"
> Some relationships to consider:
I think this is unlikely. The variation *within* Triceratops
corresponds to the gender variation in its relative Chasmosaurus.
> Styracosaurus/Centrosaurus (or is it Eucentrosaurus)
Now, this is actually quite likely. In the book I mentioned above
there is an article that suggest that Styracosaurus is the male
of *one* species of Centrosaurus, out of about 3-4 left after the
other "described species" are paired off into male-female pairs.
> How does the new pachyrhinosaurs fit in?
It is a seperate form, probably derived from Centrosaurus.
The peace of God be with you.