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Brochu (1996) concluded that crown group crocodylians have a caudal to cranial pattern of suture closure, not cranial to caudal as you state here. Likewise, Irmis (2007) observed the caudal to cranial pattern in phytosaurs.

Given that all your vertebrae preserved vertebrae are from the dorsal portion of the column and all have open sutures, I don't see how you can conclude one way or anot...

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