Temporal range: Carboniferous-Triassic
Triodus is an extinct genus of xenacanthidan shark that lived from the Carboniferous to the Triassic. It was a freshwater shark, and fossils have been found in the Chinle Formation and Black Prince Limestone of Arizona, the Petrified Forest Formation of New Mexico and the Tecovas Formation of Texas, United States.
- The Rise of Fishes: 500 Million Years of Evolution by John A. Long
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