Genuine Fossil Trilobite, 521-250 million years BC. Size: 9.5 x 6.5 x 1 inches = 24 cm x 16 cm x 2.5 cm. Meaning "three lobes" are a fossil group of extinct. Trilobites form one of the earliest known groups of arthropods.The first appearance of trilobites in the fossil record defines the base of the Atdabanian. Stage of the Early Cambrian. , and they flourished throughout the lower Paleozoic. Era before beginning a drawn-out decline to extinction when, during the Devonian. All trilobite orders except the Proetids. Trilobites finally disappeared in the mass extinction. At the end of the Permian. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years. By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed. Because trilobites had wide diversity and an easily fossilized.
An extensive fossil record was left behind, with some 17,000 known species spanning Paleozoic. The study of these fossils has facilitated important contributions to biostratigraphy. Trilobites are often placed within the arthropod.
Subphylum Schizoramia within the superclass Arachnomorpha. Are found in the literature. Trilobites had many lifestyles; some moved over the sea bed.
Most lifestyles expected of modern marine arthropods are seen in trilobites, with the possible exception of parasitism. (where scientific debates still exist). Some trilobites particularly the family Olenidae. Are even thought to have evolved a symbiotic. Relationship with sulfur-eating bacteria from which they derived food.
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