----- Original Message ----- From: "Michael Mortimer" <mickey_mortimer111@msn.com> Sent: Wednesday, November 15, 2006 12:42 AM
Is this a first? I don't know of any other taxon based on an endocast...?
*Thecospondylus* is based on a _sacral_ endocast.
I'm torn between my usual preference for naming diagnostic taxa, and the issue of whether a diagnosis is even worthwhile in cases like this where the 60 or so most closely related taxa can't be compared.