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Trilobites were arthropods that evolved from just before the Cambrian (544 to 248 Mya) and became extraordinarily diversified with possibly 20,000 species, 150 families and 10 Orders, dispersed in all seas and continents (parts of the current continents were submerged) and ranged from less than a millimeter to more than a meter in length. Some crawled, some swam, and some lived a planktonic life. Some were detritivores, others predators and scavengers. However, the entire lineage became extinct 248 million years ago. Ancestors of Trilobites had soft bodies, they died and decomposed without leaving a trace. Naraoia was an early trilobite in the lineage that branched into thousands of species with easily preserved exoskeletons that had to be shed to grow (ecdysis). In many lineages, they evolved elaborate spines on their exoskeletons, which are thought to provide stability in water, but most trilobites were too large for spines to have been useful for this. It was then thought that the spiny exoskeletons were for defense, as they are for porcupines. This idea is possible because predatory fish began to become common at that time. Other trilobites also evolved exoskeletons that curled up into an armored ball, much like armadillos do today. Discover our copies.

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