Sharksonline's Blog

Xenacanthida

Posted on: April 30, 2010

Above the Xenacanthida

1. Some Xenacanthida grow up to a length of 4 m long.

2. This group of shark lived in freshwater environments.

3. Some Xenacanthida had large serrated spines extending backwards from the neck. And had a pair of hook-like cusps.

4. The Xenacanthida Came in the Lower Carboniferous period and died out at the end of the Permian in the Permian Mass extinction. But only a few forms survived into the Triassic period.

5. The family includes the families Xenacanthidae, Diplodoselachidae and Orthacanthidae and the most notable members of the group are the genera Xenacanthus and Orthacanthus.

All of this info is from http://en.wikipedia.org/wiki/Xenacanthida

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