Supplementary Fig 2

Simple ASarea/BMAI plot to outline the position of the various studied cross sections. In the nine highlighted specimens, it is clear to see that for a given ASA there can be a range of BMAIs. The disparity in BMAI increases from the hatchling stage through to the adults. In the subadult/adult stages, some specimens possess relatively small buccal apparatus (*Revilloceras* and *Joannites*) restricting them to smaller food items whereas other specimens were capable of eating larger prey (*Nautilus*, *Sageceras*).