Today's photo is of the famous sail-backed pelycosaur Edaphosaurus from the Permian red beds of Texas. As if its sail wasn't enough to puzzle paleontologists, the fact that the neural spines bear "cross bars" further adds to the mystery (I know of no other animal that has exhibited such a feature). I picked out this one, though, because today I'm off to the AMNH to meet up with fellow paleo-blogger Amanda (the "Self-Designed Student"), and will have plenty of photos to share when I return this afternoon.
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Excellent photo of a very bizarre pelycosaur, Brian!