Editing Belemnoidea (section)

==Anatomy==
Belemnoids possessed a central rostrom/guard made of [[aragonite]] and with negative buoyancy.<ref name=Monks1996>{{cite journal|year= 1996|title= The function of the belemnite guard | first3= A. S.|last3= Gale|journal=Paläontologische Zeitschrift | first2= J. D.|pages=425–431|last1= Monks|last2= Hardwick|doi= 10.1007/BF02988082|issue= 3–4|volume= 70|first1= H. J. D.|bibcode= 1996PalZ...70..425M |s2cid= 129722176 }}</ref>  To the rear of the creature was a heavy [[calcite]] guard whose main role appears to have been to counterbalance the front (towards the head) of the organism; it positions the centre of mass below the centre of buoyancy, increasing the stability of the swimming organism.<ref name=Monks1996/>  The guard would account for between a third and a fifth of the length of the complete organism, arms included.<ref name=Monks1996/>

Like some modern squid, belemnoid arms carried a series of small hooks for grabbing [[prey]]. Belemnoids were efficient [[carnivore]]s that caught small [[fish]] and other marine animals with their arms and ate them with their [[cephalopod beak|beak-like jaws]]. In turn, belemnites appear to have formed part of the diet of marine [[reptile]]s such as [[Ichthyosaur]]s, whose fossilized [[stomach]]s frequently contain [[Phosphate mineral|phosphatic]] hooks from the arms of cephalopods.