Ribs evolved for movement first, then co-opted for breathing

When early tetrapods transitioned from water to land the way they breathed air underwent an evolutionary revolution. Fish use muscles in their head to pump water over their gills. The first land animals utilized a similar ...

The earliest well-preserved tetrapod may never have left the water

Superbly preserved fossils from Russia, excavated by an international team and reported in the journal Nature, casts new and surprising light on one of the earliest tetrapods—the group of animals that made the evolutionary ...

Researcher connects the dots in fin-to-limb evolution

About 400 million years ago, vertebrates first began to crawl from the primordial seas onto land. Last week, thanks to a cutting-edge mathematical-analysis technique, a global research team uncovered how a crucial stage in ...

'Walking' fish help scientists to understand how we left the ocean

Our ancestors' transition out of the water and onto the land was a pivotal moment in evolution. No longer buoyed by water, early tetrapods (animals with four limbs) had to overcome gravity in order to move their bodies. Exactly ...

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