Vetustodermis planus

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Vetustodermis planus is an extinct animal that lived during the Cambrian Period. It is a 5 to 10 centimeter-long fossil, found in Anning, China in 1979, and has since triggered a debate over its classification; although it has some clear molluscan affinities, such as the large muscular foot, it is not considered to be close enough to warrant placement in that phylum, meaning that a new phylum may have to be erected to hold this one species.