Today it is believed that the first fish on the land and the transformation of the fins in the limbs for movement took place 370-375 million years ago, and the first amphibians appeared in 20-30 million after this time. But all the ideas about evolution, according to the journal Nature, can change due to the discovery of scientists from the University of Calgary, Canada. They found out that the first inhabitants of the land were like a cross between snakes and fish, and the discovery was made almost by accident.
The difficulty in studying the process of becoming the first inhabitants of the earth is also that almost nothing is known about the passage of the evolution process of that period. That time in the evolutionary plan for paleontologists is a white spot, it also carries the name of “Romer’s failure”. The remains of the first animals of that period were practically not preserved in terrestrial rocks. Only isolated examples of the creatures of that era are known to science.
A group of scientists led by Jason Anderson studied the remains of the ancient amphibian Lethiscus Stocki, which belonged to the amphibians – amphibians, which are similar in their structure and way of life to sea snakes inhabiting the Carboniferous and Permian periods. Lethiscus Stocki did not have limbs, and they moved by land and water, bending the body. A team of scientists, enlightening the remains of Lethiscus Stocki with a computer tomograph, reconstructed on the computer the three-dimensional shape of the skull of this ancient creature.
As a result, it turned out that the bone system of these amphibians is not similar to that of their closest relatives. Comparing the obtained model with the found remains of the pederope (Pederpes Finneyae) and Tiktaalik Roseae, the scientists came to the conclusion that Lethiscus Stocki is the “lost link” in the evolution of land animals. According to Jason Anderson,
“This discovery makes us radically rethink what evolution could have achieved with the development of the early four-legged creatures. We used to think that the transformation of the fins in the limbs was very gradual and slow. Our find shows that this change was sharp and almost instantaneous, and some of the first four-legged lost their legs almost immediately after their acquisition. “