Tetrapod Triumph! Solving Mystery Of First Land Vertebrates

Let’s talk about Romer’s Gap, not to be confused with the Gap of Rohan (though I would love to talk about that, too, as I am always up for a bit of Tolkien). Romer’s Gap is an intriguing question mark in the fossil record that today loses a little of its mystery.

On the far side of the gap, about 360 million years ago, we’ve got aquatic tetrapods — vertebrates with four limbs — which were at that point still pretty fishy (note: not actual scientific term). On the near side of the gap, beg

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