The Prehistoric Krabs were small crabs that Patar ate with his stick in the episode "Ugh."
The Prehistoric Krabs are miniature and prehistoric versions of Mr. Krabs. They have the same eye shape as Mr. Krabs and have big, black bushy eyebrows, and have big claws. They only have one tooth on their bottom jaw. They are only seen in the episode "Ugh."
The only word that the Prehistoric Krabs say is "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 enjoys eating 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.
They are the only creatures in the prehistoric times that don't speak in caveman talk.
The Prehistoric Krabs seems to be the only crabs with a real-life appearance.