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." Description They are small and black-colored, and have several lines on their backs. History In the episode "SB-129," in the ancient sea, there are several trilobites, probably Paradoxides. They also appear in the opening credits of "Ugh." Retrieved from "https://spongebob.fandom.com/wiki/Trilobite?oldid=2293245" Categories: Characters Classification groups Characters from other eras Background characters Community content is available under CC-BY-SA unless otherwise noted.