WARNING: Minor Jurassic World spoilers (no more than would be revealed in a trailer) follow in this story.

Jurassic World director Colin Trevorrow has teased the Jurassic Park fourquel's new big scaly threat in a tweeted picture from the set.

Trevorrow posted an image of the shadow cast by the dinosaur, which is a genetic creation of those working on the fully-operational dinosaur theme park on which the film is set.

In an interview with Slash Film last month, Trevorrow confirmed the existence of the new dinosaur saying: "There will be one new dinosaur created by the park's geneticists.

"The gaps in her sequence were filled with DNA from other species, much like the genome in the first film was completed with frog DNA. This creation exists to fulfil a corporate mandate - they want something bigger, louder, with more teeth. And that's what they get."

More teeth is certainly what we can see in the picture, which depicts a more elongated head than that of a T-Rex but not as snout-like as the Spinosaurus of Jurassic Park 3.

The jaggedy appearance of the teeth and what we can make out of the top of the dinosaur's head also suggest it will be one ugly b*****d, probably to juxtapose it with the other, more familiar dinosaurs of the film.

"I know the idea of a modified dinosaur put a lot of fans on red alert and I understand it," continued Trevorrow in the same interview "But we aren't doing anything here that [writer Michael Crichton didn't suggest in his novels. This animal is not a mutant freak. It doesn't have a snake's head or octopus tentacles. It's a dinosaur, created in the same way the others were, but now the genetics have gone to the next level."

It's certainly true that such genetic alteration was suggested in Crichton's books, with the character Dr Henry Wu seeming keen on tinkering with the dinosaurs until they were fit for purpose.

Wu was given a smaller role in Spielberg's original film than he did in the books, but BD Wong will reprise his role in Jurassic World, making him the only actor to return from a previous film.

Jurassic World stars Chris Pratt, Bryce Dallas-Howard, Ty Simpkins, Omar Sy and Nick Robinson. It will be released on 12 June 2015.