History of Tetrapods: Why All Vertebrates Have Four Limbs?

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Tetrapod is a term used to encapsulate all vertebrate animals except for fish. And in the last decades, it has been unanimously accepted by paleontologists that tetrapods evolved from elpistostegalians, a close relative of fish, with the most prominent example being the Tiktaalik. This would explain why all tetrapods share a four-limbed build (or less in some cases).

But the origin of the tetrapod is not as straightforward as it first seemed, thanks to a new discovery that might reshape our understanding of tetrapod evolution.

Sources and Credits: https://docs.google.com/document/d/1rQ0L8yawgnNHe8nVrD_w4m-CXKgUUhPcQUOt7txd9RA/edit?usp=sharing

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