While it’s probably a reasonable assumption that we now have all the major groups of dinosaurs and pterosaurs, new ones do on occasion pop up. The alvarezsaurs have only really been around for 20 years and the scansoriopterigids might well turn out to be another one. In the case of the pterosaurs, the azhdarchoids have undergone a huge bloom in recent decades with several clades having been identified and are now represented by multiple species.
Perhaps the most bizarre of these are the tongue-twisting chaoyangopterids which have, for want of a better phrase, blown up heads. Monofenestratan pterosaurs (so that’s pterodactyloids plus things like Darwinopterus) are in part diagnosed by having a single large fenestra in the anterior of the skull that represents a coming together of the naris and the antorbital fenestra. In some cases this can get really big and ‘fill’ a large chunk of the skull meaning that there can be more space than bone. However, in the case of chaoyangopterids, the top of the skull is bowed outwards enormously and all that extra skull volume is filled by the nasoantorbital fenestra giving them a bizzarely shaped head that consists of thin bone struts and a hue amount of nothing.