6. Argentinosaurus
If you're thinking about having a creature that hunts and feeds on massive sauropods, then it's probably worth having a few of those as well. One of the most memorable scenes in the original Jurassic Park is the moment when the group of scientists that have been brought to the island realise that they are there to witness real live dinosaurs. As John Williams' epic score soars into the movie's theme, a giant Brachiosaur reaches up to the branches of the trees above them. It was a moment of wonder for both characters and audience, the first dinosaur they had seen. While trying completely to recreate that moment in a new Jurassic film would probably never quite work the same way, it would be appealing at least to reference this scene. If "bigger means better" is the mantra by which sequels choose to operate, then Argentinosaurus fits the bill perfectly. Arguably the biggest dinosaur of them all (there'll always be some debate on that), it was an even grander creature even than the first movie's Brachiosaur, over 100 feet long and weighing upwards of 80 tonnes. If Jurassic World wants to set out its stall as a movie of bigger scale than the previous three, it could certainly do worse than introducing this Cretaceous giant early on.