Rutiodon was a Phytosaur, a group closely related to true crocodiles but older, that lived only in the Triassic Period.
The largest members could reach 6-8 meters. They fed on almost everything on their habitat, like amphibians, fish, or even the fast dinosaur Coelophysis.
Rutiodon didn't appear in Walking with Dinosaurs television series, but it made an appearance in the companion book.