Trilobites are extinct arthropods in the class Trilobita. They appeared in the Cambrian period and flourished throughout the lower Paleozoic era before slowly declining to extinction. The last of the trilobites disappeared in the mass extinction at the end of the Permian 250 million years ago (m.y.a.). Most were simple, small marine creatures that walked along the seafloor and filtered mud to obtain food.
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| - Trilobites are extinct arthropods in the class Trilobita. They appeared in the Cambrian period and flourished throughout the lower Paleozoic era before slowly declining to extinction. The last of the trilobites disappeared in the mass extinction at the end of the Permian 250 million years ago (m.y.a.). Most were simple, small marine creatures that walked along the seafloor and filtered mud to obtain food.
- Trilobites are very well-known, and possibly the second-most famous fossil group, after the dinosaurs. When trilobites appear in the fossil record of the Lower Cambrian they were already highly diverse and geographically dispersed. Because of their diversity and an easily fossilized exoskeleton, they left an extensive fossil record with some 17,000 known species spanning time. Trilobites have been important in biostratigraphy, paleontology, and plate tectonics research. Trilobites are often placed within the arthropod subphylum Schizoramia within the superclass Arachnomorpha (equivalent to the Arachnata), although several alternative taxonomies are found in the literature.
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| - Asaphiscus wheeleri, a trilobite
- from Cambrian-age shale in Utah
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| - *Agnostida
*Redlichiida
*Corynexochida
*Lichida
*Phacopida
*Proetida
*Asaphida
*Harpetida
*Ptychopariida
*Nektaspida
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| - Trilobites are extinct arthropods in the class Trilobita. They appeared in the Cambrian period and flourished throughout the lower Paleozoic era before slowly declining to extinction. The last of the trilobites disappeared in the mass extinction at the end of the Permian 250 million years ago (m.y.a.). Trilobites are very well-known, and possibly the second-most famous fossil group after the dinosaurs. They are the most diverse group of animal species preserved in the fossil record, consisting of nine (or possibly ten) orders and over 15,000 species. The trilobites are currently included along with the Chelicerata in the group Arachnomorpha. Most were simple, small marine creatures that walked along the seafloor and filtered mud to obtain food.
- Trilobites are very well-known, and possibly the second-most famous fossil group, after the dinosaurs. When trilobites appear in the fossil record of the Lower Cambrian they were already highly diverse and geographically dispersed. Because of their diversity and an easily fossilized exoskeleton, they left an extensive fossil record with some 17,000 known species spanning time. Trilobites have been important in biostratigraphy, paleontology, and plate tectonics research. Trilobites are often placed within the arthropod subphylum Schizoramia within the superclass Arachnomorpha (equivalent to the Arachnata), although several alternative taxonomies are found in the literature. Different trilobites made their living in different ways. Some led a benthic life as predators, scavengers, or filter feeders. Some swam (a pelagic lifestyle) and fed on plankton. Most life styles expected of modern marine arthropods are seen, except for parasitism. Some trilobites (particularly the family Olenida) are even thought to have evolved a symbiotic relationship with sulfur-eating bacteria from which they derived food.
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