Mantellisaurus is a species of iguanodontid dinosaur from the Early Cretaceous of Europe. It is known from England, Belgium, and possibly Germany. It was originally believed to be a species of Iguanodon. However, a closer look at its skeleton in 2007 determined that it was its own genus. It is named in honor of Gideon Mantell, the original discoverer of Iguanodon.
In The Land Before Time
A tan and red Mantellisaurus briefly appears at the end of the episode, The Hidden Canyon, where it can be seen among the crowd listening to the story of how Daddy Topps battled Red Claw.