Callovosaurus

Callovosaurus was a small, primitive Iguanodontid (or, as some research suggests, possibly a dryosaurid) Dinosaur that lived in North America and Europe during the Late Jurassic period, around 145 million years ago. Callovosaurus due to its long face might have been the first ancestor of the Inguanodontid.

In Jurassic Park
Callovosaurus' name accidentaly replaced that of Microceratops' in some editions of the Jurassic Park novel. So, Callovosaurus does not canonically appear in the Jurassic Park universe.