The Tanystropheus is a protorosaur that is found in the lost world section of the Krusty Krab's lost and found. It appears in the episode "Lost and Found", as well as its online game adaptation, Lost Treasures.
It is a long, tall, orange reptile with red spots on its back, neck and tail. It has short, smaller legs and red around its eyes. It also appears to have a very wrinkled mouth.
Role in episode
While Ginger and the other lost kids chase SpongeBob through the Lost and Found, they pass through the lost world. SpongeBob rides on a Tylosaurus, while Ginger and the other lost kids ride in a box on the Tanystropheus' back.
At the end of the episode, when Squidward is lost in the lost world, a Tanystropheus can be seen walking around.
Role in Lost Treasures
The Tanystropheus reappears as an obstacle in level 5. Like "Lost and Found," it carries the lost kids on its back.
- Tanystropheus on Wikipedia