Reconstructions show how 'rangeomorphs' lived

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''A bizarre group of uniquely shaped organisms known as 'rangeomorphs' may have been some of the earliest animals to appear on Earth, uniquely suited to ocean conditions 575 million years ago. A new model has resolved many of the mysteries around the structure, evolution and extinction of these 'proto animals'...''

http://www.sciencedaily.com/releases/2014/08/140811170201.htm