Annelida

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Annelida Phylum of coelomate worms which posses a definite head and good metameric segmentation. The body is elongate, and each segment has bristles. Their fossils are found in rocks dating from the Cambrian, and possible fossil annelid worms are known from Precambrian sediments in S. Australia. They are represented today by the earthworms, sandworms, and leeches.

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