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Wiwaxia corrugata is a small slug-like creature that lived around 505 million years ago in the period of time known as the Cambrian. It was just one of many genera that appeared in the ‘Cambrian Explosion’, one of the most prolific periods of diversification of life on the planet. Its affinities are still debated, but a number of morphological features place it close to or within the phyllum Mollusca. It was a very small animal, ranging in size from 0.8 to 50mm (about an inch on average). Its body was covered with plates and spines called sclerites except on its underside. It had an unsegmented body. Near its front end, it had a pair of arc shaped bars that were made up of a row of conical teeth. The species found in the famous Burgess Shale in the Canadian Rockies is called Wiwaxia corrugata. Other specimens have been found around the world, from China to the Czech Republic. These are thought to be different species of Wiwaxia.


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