Triodus Fossil range: Permian
Triodus.
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Order:	Xenacanthida
Family:	Xenacanthidae
Genus:	Triodus

Triodus is an extinct genus of xenacanthidan shark that lived in the Permian. It was a freshwater shark, and fossils have been found in Germany.

[edit] Sources

• The Rise of Fishes: 500 Million Years of Evolution by John A. Long

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