Just taking a couple names from a wikipedia article on pterosaurs...

Hatzegopteryx: Very large. I can't pin down an exact size, but I've got a weak internet-fu

Nemicolopterus: The wiki article has a picture that looks a lot like a couple of hummingbirds. That said, it's only got a 10 inch wingspan, less than a foot.

Sordes: genus means filth/scum in latin, specific name means hairy. A primitive Bat?

Ornithocheirus Mesembrinus: Interesting beak shape, toothed.

Family Tapejaridae: The what are with those crests?!

If you don't make any of the others, the second one and that last one (the family) should definitely be ones you make a monster entry or two for. Those crests...