Clearly Alten is more interested in the sea creatures than the land creatures, and presumably The Meg’s movie sequels would be too.
The Meg is based on a book series written by Steve Alten The first Jonas Taylor-based story is mostly about the Megaladon, but subsequent novels follow other creatures.
The Terror features the Kronosaurus. a large whale called a Livyatan, a snake called Titanoba, and even a T-rex in a prologue in one of the books.