Pliosaurs are like derived pterosaurs in very few ways,
but this one stands out: The premaxilla extends all the way back to the parietal (Fig. 1) in both clades.
Other sauropterygian taxa split the nasals
as the premaxilla extends to the frontals. Pliosaurs also split the frontals with the invading premaxilla (Fig. 1).
in pterosaurs the premaxillae more or less sits on top of the nasals and frontals whenever the premaxillae extend posteriorly.
If you’ve ever had an interest in the giant pliosaur, Kronosaurus
you will be thrilled to read McHenry 2009. It’s chock full of details like this (Fig. 1).
McHenry CR 2009. ‘Devourer of Gods’ The palaecology of the Cretaceous pliosaur Kronosaurus queenslandicus. PhD dissertation, U of Newcastle.