Placoderm, Hong Kong’s oldest fossil, an armoured fish that ruled marine world for ... such as the great white shark, could be similarly vulnerable to climate change. The megalodon, great ...

They analyzed little skates and bamboo sharks (cartilaginous fish), sea lampreys and hagfish (jawless fish), and even examined fossils of ancient armored fish. Using advanced scanning techniques ...

The most formidable of them were the armored placoderms ... The cartilaginous fish, so-called because cartilage formed their skeletons, later gave rise to sharks and rays. They had small, rough ...