Sporting an upper dorsal fin which looked like the top part of the Starship Enterprise, an adult male Stethacanthus lived about 320 million years ago.

Animal trivia: Stethacanthus, a strange prehistoric animal
Animal trivia: Stethacanthus, a strange prehistoric animal

A pretty typical shark otherwise, Stethacanthus likely used its unique dorsal fin in mating rituals or to scare away predators.

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