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The results are published today (27 August) in the journal Historically, the origin, evolution and spread of animals has been viewed as having begun during the Cambrian Explosion, a period of rapid evolutionary development starting 541 million years ago when most major animal groups first appear in the fossil record."However, in recent decades, discoveries of preserved trackways and chemical evidence in older rocks, as well as molecular comparisons, have indirectly suggested that animals may have a much earlier origin than previously thought," said Dr Alex Liu of Cambridge's Department of Earth Sciences, lead author of the paper.Terebrataliidae in the fouling of hydrotechnical installations in Peter the Great Bay, Sea of Japan".

However, new fossils found in and showed that the "chain mail" of tommotiids formed the tube of a sessile animal; one tommotiid resembled phoronidswhich are close relatives or a subgroup of brachiopods, while the other tommotiid bore two symmetrical plates that might be an early form of brachiopod valves.

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By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata. Entoprocta or Kamptozoa Ectoprocta moss dating bad timing.

Although they are mobile during their larval stage, many adult brachiopods are fixed to some object on the sea floor by a fleshy stalk that protrudes through an opening in the shell. Embryology and phylogeny in annelids and arthropods.

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