Canadaspis perfecta (a crustacean)
Researchers have encountered the Canadaspis perfecta over 4,000 in the Burgess Shale. Its structure and bodily functions have been the subject of many research intiatives. As a crustacean, it is an early ancestor of crabs and lobsters. It has a segmented tail, a chitinous shell surrounding its body, and walking legs equipped with gills. The functions of these body parts are only speculative, conclusive results have not been reached.
For more information... http://www.fossilmuseum.net/Cambrian-Explosion/Canadaspis-perfecta/CE05.htm
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