By ThePhysicist
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Yes, sharks used to have spines! Xenacanth sharks in the Permian and Hybodont sharks did as well. This is the only shark spine I've seen from the Devonian - if you've got one, would love to see it.
Photo Information
- Taken with Apple iPhone SE (1st generation)
- Focal Length 4.2 mm
- Exposure Time 1/30
- f Aperture f/2.2
- ISO Speed 40
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