Some quick concept doodles for a speculative type of marine pterosaur. The very earliest discoveries of pterosaurs were actually interpreted as being aquatic animals, and I wanted to play with that idea a bit while keeping the anatomy recognizable.
These guys are vaguely based on Pteranodon. They use their wing-flippers to cruise around like manta rays, with their crests serving as dorsal fins and their feet reduced to small fluke-like flippers for steering.
I imagine they’re probably capable of spectacular breaching and gliding short distances over the water’s surface to escape predators, similar to flying fish and squid.