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Stethacanthus
The weird "spine and brush" structure on the back of this 375 million-year-old maleStethacanthusmay have served as a sexual signaling device, making it easier for females to pick out potential mates, or was perhaps used in combat by males. Like many early sharks,Stethacanthuswas only a few feet long.

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Stethacanthus


 
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Picture: Ivy Rutzky |
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