The squid equivalent for the episode (appears getting eaten by Ophthalmosaurus), the genus Belemnotheutis, which would have been a very common sight in the shallow seas covering Europe during the Jurassic. Huge shoals of these pelagic carnivores would have have flitted through the sunlit waters after smaller fish and cephalopods, and were themselves a staple prey item for the region's numerous species of marine reptiles; fossils of their tentacle hooks and guards have been found preserved in their guts.
Interesting fact; the preservation of these marine deposits is so exquisite that fossilized ink sacs have been found from Belemnotheutis which could still be used to produce useable pen ink in the present day.