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The Fish-Tetrapod Transition

In Our Time: Science

CHAPTER

Ictheostiga - An Early Terapod?

Ictheostiga was an early tetrapod. It's been known for many years, but new material was discovered in the 1980s and beyond. And this helped us build up a better picture of what the structure looked like. This animal was previously reconstructed as being kind of a classic land walking sort of amphibian style animals. But then with actually being able to look at the fossil in more detail, suggests that actually the animal wasn't capable of putting its arms and its legs out to the side like that. The range of movement in its limbs, they were quite muscular, as we can tell from kind of the size of the bones and scars or areas where muscles might be attached

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