Trilobite

Trilobites are arthropods of the class trilobita which thrived on the earth throughout the Paleozoic era. Trilobites fell into extinction at the end of the Paleozoic, some 20 million years before the emergence of dinosaurs in the Mesozoic era. They are known for their body shape, especially in skeletal (fossilized) form, consisting of three horizontal sections and three lateral lobes.

Fossils

 * This section needs to be expanded.

Specimens
Though previously thought to be extinct, a trilobite in perfect condition was discovered during the Oto Island Expedition inside one of Godzilla's footprints. Like the area around the path of destruction, the trilobite exhibited high levels of radiation, miraculous given its survival. Whether the trilobite was alive when collected was left unrecorded; its particular species is also unknown.

By 2003, professor Shin Takuma had demonstrated the wide potential of DNA computers by bringing to "life" a cybernetic trilobite, constructing a body around a fossilized remain from components of modern horseshoe crabs and animating the creature via DNA computer. That year, his technique was refined on a massive scale for the Kiryu Project.

Imagery
Several kaiju and mecha designs have been speculatively accredited to the recognizable shape of trilobites
 * The flying form of Hedorah, possibly one of the many homages to the 1954 film in Godzilla vs. the Smog Monster
 * The giant sea lice called Shockirus which overtook the crew of the Yahata-maru in The Return of Godzilla;
 * The Super X in The Return of Godzilla, and by implication its successors in Godzilla vs. Biollante and Godzilla vs. Destoroyah
 * The "micro form" of Destoroyah photographed in a Tokyo aquarium in Godzilla vs. Destoroyah.