Xenacanthus is a genus of prehistoric sharks. The first species of the genus lived in the later Devonian period, and they survived until the end of the Triassic, 202 million years ago. Fossils of various species have been found worldwide. Xenacanthus had a number of features that distinguished it from modern sharks. This freshwater shark was about...
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http://en.wikipedia.org/wiki/Xenacanthus
long-surviving but now extinct genus of freshwater sharks. Xenacanthus survived from the end of the Devonian Period, some 360 million years ago, to ... [2 related articles]
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http://www.britannica.com/eb/a-z/x/1
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