Just wondering if you have explored all the possibilities for pterosaur ancestry, and if you include many specimens of various genera within your pterosaur tree? In my studies no two specimens score alike, except conspecific juveniles and adults.
See: http://reptileevolution.com/MPUM6009-3.htm (pterosaur tree) and http://reptileevolution.com/reptile-tree.htm (where pterosaurs fit in tetrapods