The origin of pterosaurs (1)

To this point I have not posted about the origin of pterosaurs. I will do that now in a series of posts.
I will work on the basic idea that pterosaurs stem from the archosauromorpha.
And I will build upon the work of David Peters who has developed (in amazing detail) the case that pterosaurs developed from gliding creatures like Sharovipteryx and Longisquama..

Here are some helpful references:

http://pterosaurheresies.wordpress.com/2011/09/07/sharovipteryx-and-the-origin-of-pterosaurs/

http://pterosaurheresies.wordpress.com/2012/05/26/protopterosaurus-still-the-official-poster-child-for-pterosaur-ancestry/