The Prehistoric Krabs were one of the small crabs that Patar ate with his stick in the episode "Ugh." The only words the Prehistoric Krabs say are "Money." They have the same exact characteristics as Mr. Krabs, being single-minded in a goal to obtain money, and they also look and sound like him. Patar liked to eat them, the episode has shown him eating them by burning them and eating them in one gulp. The Prehistoric Krabs dwell under rocks. They also think about money, much like the present Mr. Krabs.
The Prehistoric Krabs are miniature and prehistoric versions of Mr. Krabs. They have the same eye shape as Mr. Krabs, and they have big meaty claws. They only have one tooth on their bottom jaw that sticks up over their top lip. They are only seen in the episode "Ugh."
They are the only creatures in the prehistoric times that don't speak in caveman talk.
Prehistoric Krabs seemed to be the only crab with a real life appearance.