Trilobites are extinct arthropods that form the class Trilobita. They appeared in the 2nd Epoch (Series 2) of the Cambrian period and flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Late Devonian extinction, all trilobite orders, with the sole exception of Proetida, died out. The last of the trilobites disappeared in the mass extinction at the end of the Permian about 250 million years ago (m.y.a.).

Trilobite in "Worlds Enough, and Time"Edit

The trilobite was actually a lifeform from another planet, one of several introduced to Earth by a family of intergalactic tourists when their aquarium failed.

Trilobite in WorldwarEdit

The krellepem, an edible aquatic animal native to Home, strongly resembled the trilobite of Earth's distant past.

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