Temporal range: Serpukhovian
An artist's illustration of Thrinacoselache gracia
A fossil of Thrinacoselache gracia
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Family: Thrinacodontidae
Genus: Thrinacoselache
Grogan & Lund, 2008
Referred species
  • Thrinacoselache ferox (Turner, 1982)
  • Thrinacoselache gracia (Marsh, 1890)
  • Thrinacodus ferox Turner, 1982

Thrinacoselache is an extinct genus of basal elasmobranch from the Serpukhovian-aged lagerstatte, Bear Gulch, of what is now Montana. Thrinacoselache could grow up to 1 meter long but was barely 2 cm tall. Its serpentine body and long thin jaws would've given it a pike and conger eel-like appearance rather than a shark's.

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