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|Kingdom:||Animalia (Animal) (WP)|
|Phylum:||Arthropoda (Arthropod) (WP)|
|List of species|
A trilobite is a class of primitive artropods that lived during the Paleozoic Era. In the episode, "SB-129," in the ancient sea, you can see several trilobites, probably Paradoxides. They also appear in the opening credits of "Ugh."