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Named By: Agassiz in 1837
Time Period: Early Carboniferous
Location: Scotland
Size: 60 centimetres long
Diet: Carnivore
Fossil(s): Fin spines
Classification: | Chordata | Chondrichthyes | Elasmobranchii | Ctenacanthida |

Tristychius is an extinct genus of shark from the Carboniferous period. Fossils have been found in Scotland.

Tristychius was a small shark, about 60 centimetres (2 ft) long. It had a well-developed upturned caudal fin, similar to that of many modern sharks. Physically it may have resembled a modern dogfish. Tristychius also had spikes attached to the bases of its dorsal fins, probably for protection against predators.

Read more about Tristychius at Wikipedia
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