In Our Time

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Melvyn Bragg and guests discuss the ideas, people and events that have shaped our world.

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In Our Time: The Fish-Tetrapod Transition

The Fish-Tetrapod Transition

BBC Radio 4 - In Our Time, The Fish-Tetrapod Transition

Melvyn Bragg and guests discuss one of the great stages in the evolution of life on Earth.

Melvyn Bragg and guests discuss the great evolutionary change that gave rise to all the land animals on Earth with a backbone, when some fish developed limbs, lungs and necks.

Melvyn Bragg and guests discuss one of the greatest changes in the history of life on Earth. Around 400 million years ago some of our ancestors, the fish, started to become a little more like humans. At the swampy margins between land and water, some fish were turning their fins into limbs, their swim bladders into lungs and developed necks and eventually they became tetrapods, the group to which we and all animals with backbones and limbs belong. After millions of years of this transition, these tetrapod descendants of fish were now ready to leave the water for a new life of walking on land, and with that came an explosion in the diversity of life on Earth.

The image above is a representation of Tiktaalik Roseae, a fish with some features of a tetrapod but not one yet, based on a fossil collected in the Canadian Arctic.

With

Emily Rayfield
Professor of Palaeobiology at the University of Bristol

Michael Coates
Chair and Professor of Organismal Biology and Anatomy at the University of Chicago

And 

Steve Brusatte
Professor of Palaeontology and Evolution at the University of Edinburgh

Producer: Simon Tillotson

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