Scylla Posted September 7, 2020 Share Posted September 7, 2020 We thought sharks' cartilaginous skeletons existed because endochondral bone evolved after sharks branched off the family tree, but this Placoderm common ancestor of sharks and bony fishes has bone. This indicates that sharks may have lost the ability to make endochondral bone. https://phys.org/news/2020-09-ancient-bony-fish-rethink-sharks.html 3 Link to comment Share on other sites More sharing options...
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