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HYBODUS:
Hybodus was one of the most common sharks during the time of the dinosaurs. This shark lived in the ocean alongside the Ichthyosaurs and Plesiosaurs.
FOSSIL EVIDENCE:
Lower Jurassic Period, Hybodus fossil found in Germany.
STETHACANTHUS:
The strange spine-with-brush structure on the back of this 375 million year old Stethacanthus may have been used to attract females. As with birds, the more elaborate the male's adornment, the more females like them. This decorative spine on Stethacanthus may have made it easier for females to pick out potential mates, and may also have been used in combat between males fighting for a female. Like many early sharks, Stethacanthus was only a few feet long.
FOSSIL EVIDENCE:
375 million year old Stethacanthus fossil.
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