The Atlantean Dinosaur, or Dinosaur Warrior, is a large enemy unused in the first Tomb Raider game. The creature's head is similar to the other Atlantean enemies but it's body is like that of a dinosaur.
To attack, the dinosaur is able to make swipes with it's hands.
The level in which the dinosaur was found within suggests that it would have appeared in Atlantis. The Official Tomb Raider Fact Files (2001) also supports this.
At one point, the enemy was incorrectly textured, as shown below.