A trilobite is a class of primitive arthropods that lived during the Paleozoic Era. In SpongeBob SquarePants series, they appear in the episodes "SB-129" and "Ugh."


They are small and black-colored, and have several lines on their backs.


In the episode "SB-129," in the ancient sea, there are several trilobites, probably Paradoxides. They also appear in the opening credits of "Ugh."

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