[2] The type specimen that defines this species is named Ischnacanthus gracilis, and helps outline the Ischnacanthidae family it belongs to.

Fossils of this fish were first discovered in Tillywhandland Quarry, Forfar, Scotland.

They possess highly advanced, spindle-shaped bodies that were thought to have made them swift swimmers.

[3] It was a predatory fish that possessed a mouth with very small teeth on the lower jaw.

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