page_title: Tristychius
hierarchical_section_title: Tristychius
caption_attribution_description: English: Life reconstruction of Tristychius arcuatus
context_page_description: Tristychius is an extinct genus of shark from the Carboniferous period. Fossils of T. arcuatus, the type and only species, including fin spines have been found in Scotland.
  Tristychius was a small shark, about 60 centimetres 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.
context_section_description: Tristychius is an extinct genus of shark from the Carboniferous period (Visean). Fossils of T. arcuatus, the type and only species, including fin spines 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.
caption: Life reconstruction of Tristychius arcuatus
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