What does the pterosaur family tree look like?
There are two major groups of pterosaurs, the long-tails and the short-tails. The former were the first to appear, and are commonly (though imprecisely according to cladists) referred to as rhamphorhynchoids. The latter appeared in the Late Jurassic, and are called pterodactyloids. Rhamphorhynchoids died out at the end of the Jurassic, leaving the pterodactyloids as their successors.
