Is it possible that Dimetrodon's sail extended all the way up its neural spines?

Hi Went,

As far as I know we don't have any soft part preservation for Dimetrodon, so much of what we "know" about the sail is inferred from the structure and anatomy of the neural spines themselves. One species, Dimetorodon giganhomogenes, has neural spines that bend sharply at their terminal end. It's been interpreted that the bending would have prevented the sail from extending all the way up the spines. This might mean that the sail didn't extend all the way up in most species, or it might be that this species was unique. It's not possible to say without more fossils. If you have access, you can read the article about that species here: … 20-5.1.104