Nyctosaurs

An illustration by paleo-artist Mark Witton, showing some very odd pterosaurs: 

 

Found via this old post on Tetrapod Zoology, from which I also learned that baby pterosaurs are called "flaplings."

Saint George and the Pterodactyl

This unusual illustration is by Victorian natural-history artist Benjamin Waterhouse Hawkins, who also designed and built giant dinosaur sculptures for an exhibition at London's Crystal Palace.

Sailing pterosaurs

Computer rendering shows how Tapejara wellnhoferi might have sailed, catching the wind with its head crest and wings.

I can't help thinking this creature would make a fine rubber ducky. (And no, the notion of a pterosaur rubber ducky isn't a contradiction in terms. See here for all the discussion of the relevant semantic issues you'll ever need.)