Trilobite: Extinct Marine Arthropods

Trilobites formed the class Trilobita and are well known marine and extinct arthropods whose fossils have been recovered from different places. The first fossil record suggests that they were present in the Early Cambrian Period but studies indicate that they flourished well in the lower Paleozoic era and become extinct with the beginning of the Devonian Period. They underwent mass extinction at the end of Permian about 250 million years ago. They were the most successful species that were present on the earth for about 270 million years. Their fossil record suggests that they were already dispersed in different locations. As their exoskeleton was perfect to undergo fossilization about 17,000 species have been found out which belong to the Paleozoic time. These fossil records have contributed a lot towards biostratigraphy, paleontology, evolutionary biology and plate tectonics.

Source: http://EzineArticles.com/6074735

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