Altispinax (meaning "with high spines") is a dubious genus of large predatory theropod dinosaur from the early Cretaceous in what is now Germany.
Altispinax is only known from a single tooth though multiple fragmentary pieces show it to have a sail it was traditionally thought to be a spinosaurid or megalosaurid it is now thought to be similar to Acrocanthosaurus although most is unknown about the Altispinax as the only reliable fossil is the original tooth.
There is almost no physical information about this dinosaur. After it´s escape, it killed a local farmer and his cattle and was killed by a army helicopter.
- In the novel, Altispinax is described as a quadrupedal dinosaur, in realty it was a bipedal like all theropods in the novel. It is possibly that the author might of mistaken Altispinax for the pelycosaur Dimetrodon.