User blog comment:Dinosaurus1/What is the Arlix?/@comment-34865525-20171206214748

If I recall correctly, there was a rumor that popped up in early 2015 that said that a T. rex/mosasaur/shark/gorilla/frog hybrid by the name of "Arlix" was supposed to be in Jurassic World.

I doubt that the concept of Arlix was ever actually considered at Universal during the film's production, and I have similar doubts that they're going to acknowledge it in Fallen Kingdom.