Taxonomy term


Evolution of eyes, not limbs, led fish onto land

In the Middle Devonian, roughly 385 million years ago, the first vertebrates began making their way out of water. For these pioneering fish, the adaptation of fins into limbs facilitated the transition. But in a new study, researchers have found that millions of years before fully functional terrestrial limbs evolved, some fish were developing better eyesight — an evolutionary adaptation they suggest gave an advantage to fish hunting insects near the shore.

28 Jun 2017

Closing a gap in the tetrapod fossil record

The story of how fish evolved into four-legged land animals called tetrapods has long been left incomplete by a 15-million-year gap in the fossil record, known as Romer’s Gap, which stretches from the end of the Devonian Period into the Carboniferous. Whether the gap is due to the actual absence of tetrapod fossils from this interval, or whether such fossils exist but have not been found yet has long remained unclear. A new study, however, shows tetrapod fossils from the base of the gap, adding to a growing list of discoveries that appear to be closing the gap.
07 Sep 2015

Tetrapod tracks reset timing of four-legged evolution

About 18 million years earlier than they were thought to exist, tetrapods — vertebrates with four limbs instead of fins — walked in what is today Poland. A new study published in Nature describes tracks belonging to a tetrapod in a Polish tidal flat, dating to the Middle Devonian period, about 395 million years ago. The discovery may prompt scientists to completely reassess the environment, origins and timing of early tetrapods.

07 Jan 2010