The origin of the cartilaginous fish thanks to a prehistoric shark

The shark is a species of the sea that causes a great sensation among scientists. It is known that only the shark bite has an intensity of up to 20,000 times higher than what you would do when you are chewing meat. Can you imagine what that means?

Well, scientists are surprised by a new finding that leaves much to reflect on its evolution as a species. Thanks to a skeleton and skull found, whose age is at least 380 million years old, the origins of this species have been traced.

Yes, just as dinosaur bones and eggs have been found in the world, the finding of this skeleton and skull could be preserved to this day. According to the first research on evolution, the shark could have a close relationship with the life of the eel.

A find made in Morocco

In terms of fossils and shark teeth that exist, the remains that are possessed so far are numerous. The issue is that the shark makes a big difference compared to the other fish in the sea, since its cartilaginous nature is more marked than that of other marine species.

But, with the finding of this skeleton, the story about shark evolution will change radically. Until then, scientists had to speculate a lot about the nature and characteristics of this animal. Imagination was the best ally for scientists.

The discovery of the “shark” remains 380 million years ago was made by paleontologists in Switzerland. This team of researchers, after an expedition to the mountains located east of Little Atlas, located in Morocco, managed to find this great track.

The study was published in the famous magazine Proceedings of the Royal Society B

And it is not only a single skull. There were several who were identified, in addition to two skeletons, although not completely complete. These primitive skeletons are classified as part of the Phoebus genus; a species of which there was only record of fossil teeth and certain fin spines.

This finding, which will forever change the concept of shark evolution, was published recently in the famous scientific research medium Proceedings of the Royal Society B. The conclusions have made it clear that the ancient body of sharks was very similar to a long snout, identical to that of the eel.

For now, this discovery allows sharks to be related to the eel family: Chlamydoselachus anguineus. However, it is necessary to understand the whole picture of what this discovery entails. Kristian Klug, who is a paleontologist at the University of Zurich and participated in the study in the study, there are very notable differences between current and ancient sharks.

The difference between shark teeth

What this researcher concludes is that modern people have very jagged teeth. Thanks to this, it is easier for them to cut off their prey, thus facilitating the process of eating the pieces of meat. In the case of sharks that are part of the Phoebus family and the gorguera (which are called eagle sharks), their stores have a more conical dimension.

This type of tooth is also characterized by pointing inwards. Which allows this type of shark to have a more accurate grip of the prey. The purpose of the tooth is to capture, but not to dismember. These are two very key aspects to understand the evolution of this species.

On the fossilized remains that were identified, it should be noted that the Phoebus family remained in a marine basin of shallow characteristics. It is said that this basin is about 360 to 370 million years old. It is precisely this environment that allowed fossils to survive properly.

Sharks and cartilaginous fish

When the ancient sharks of the marine basin in which he lived died, low oxygen levels allowed for better conservation. The most essential topic of the research was later related to the study of the phylogenetic of the different species.

Thanks to the study of the teeth, it could be deduced that the appearance of cartilaginous fish can date from before 380 million years. The other interesting fact is that the anguilliform anatomy of the Phoebus-class shark has no precedent in the fossil record at the moment.

The finding of these remains is then presented as a unique test in the history of paleontology, in face of what is the current shark species. The study on the nature of these species continues, offering new lights on their genetic evolution.

This research throws new curiosities about what the shark represents, one of the most famous predatory species that exists in the marine kingdom.

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