Altispinax (with high spines) is a dubious genus of large predatory dinosaur from the early Cretaceous in what is now Germany.
Description
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