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Budd, G. (2009-08-01). The earliest fossil record of the animals and its significance. In Animal Evolution: Genomes, Fossils, and Trees. : Oxford University Press. Retrieved 12 Nov. 2019, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199549429.001.0001/acprof-9780199549429-chapter-1.