Evolution of Stingrays

Like sharks sting rays don't really have bones and instead have a skeleton made out of cartilage. This means there bodies don't fossilize very well and are usually lost to time. Despite this there is a lot that their genetics, close relatives and the few scant complete fossils can tell us about how they evolved.

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Sources:
https://onlinelibrary.wiley.com/doi/f...
https://onlinelibrary.wiley.com/doi/p...
https://www.mdpi.com/2226-4310/3/3/20...
https://hal-insu.archives-ouvertes.fr...
https://www.britannica.com/animal/fis...
https://www.pnas.org/content/112/52/1...

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