Hey gang, somethin' a little bit different. Here's an illustration of Dian, the Beautiful--as she faces off one of the dread Mahars of Pellucidar. This is a cover for the National Capital Panthans, an Edgar Rice Burroughs fan club.
Y'know, it's been awhile since I read the Pellucidar novels, but I'm pretty sure the Mahars were supposed to be some kind of highly-evolved, ESP-enabled pterodactyls. I think you're right about the Thidpars--they were pterodactyls, but they weren't the intelligent ones.