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Ancient jawless fish's head fossilized in 3D hints at evolution of vertebrate skulls

(CNN) Hundreds of millions of years ago, jawless fishes swam Earth’s seas, their brains protected on the outside by armored skin, and on the inside by plates made of cartilage. Scientists are still piecing together how modern vertebrates’ skulls evolved from these ancient fish ancestors, which were the first animals with backbones. Now, recent analysis of a spectacular fossil is filling in some gaps. ....

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Ancient jawless fish's head fossilized in 3D hints at evolution of vertebrate skulls

Ancient jawless fish's head fossilized in 3D hints at evolution of vertebrate skulls
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Ancient Fish Fossil Could Help Explain How Our Skulls Evolved

The fossilized skull of a 455-million-year-old fish reveals an anatomy that's completely new to the study of vertebrates, bridging a knowledge gap of 100 million years. ....

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¿Cómo puede contribuir la 'caspa de tiburón' a la conservación de los arrecifes de coral?


Durante 400 millones de años, peces parecidos a los tiburones han merodeado los océanos como depredadores, pero ahora los humanos matan 100 millones de tiburones por año, alterando radicalmente las cadenas alimentarias del océano.
Con base en escamas microscópicas de tiburón encontradas en arrecifes de coral fósiles y modernos en el Caribe de Panamá, los científicos del Smithsonian revelan los roles cambiantes de los tiburones durante los últimos 7 mil años, tanto antes como después de la caza de tiburones en esta región. Esperan que este nuevo uso de los dentículos dérmicos proporcione un contexto para estrategias innovadoras de conservación de arrecifes. ....

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