Segnosaurus

Segnosaurus (slow reptile) was a therizinosaur that lived in Cretaceous Mongolia. It was the first relatively complete skeleton of a therizinosaur discovered.

Jurassic Park
Segnosaurus never appeared in the films or novels, but it appears in Jurassic Park III: Park Builder.

Trivia

 * Segnosaurus is one of only three therizinosaurs in the franchise. The other two being Therizinosaurus and Beipiaosaurus.