Xenacanthus is a genus of prehistoric
sharks, belonging to the family
Xenacanthidae and the order
Xenacanthida. 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. These freshwater species had a long spine at the back of their head. As in all fossil sharks, Xenacanthus is mainly known because of fossilised teeth and spines.
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XENACANTHUS decheni
This fresh water shark was characterized by a large spine protruding from the back of its head as well as little forked teeth. Since it did not possess true bone, mostly spines and teeth are discovered giving a rather limited view of this interesting animal.
TIME - 345 MYA, Carboniferous period. Some species survived into the mid - Permian period.
RANGE - USA - Texas, Oklahoma, Kansas, New Mexico. Fossils of this shark are also found in Russia and some sites in Eastern Europe.
see time period
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