As usual I did a bit of research after writing this mail to make sure I wasn't making a fool of myself (if I am not already) and found something odd about Preondactylus: The wingspan is stated as 1,5 m but the weight is put at 10 kg, and my working knowledge of flying creatures, birds mainly, tells me the animal should weigh at least 6 or 8 times less.
Renato Santos