Today, spiders spend most of their time on Earth, wandering in the fields, forests and deserts, and all other ground habitats are there. But this does not mean that their ancestors have always lived on Earth.
A new study in Current biology It indicates that the ancient elements – the group of arthropods that include spiders, scorpions and their close relatives – may have been originally from the ocean residents. Based on the macro structures and nerves strictly preserved for the fossilized marine arthropods about 500 million years ago, the study showed that the first Aprien appeared in the oceans and then moved to the decline later.
Nicholas Straussfield, author of a study and neuroscientist at Arizona University, said in A. statement. But the new research provides some answers, which suggests that the ancestors of spiders and scorpions may have a more moisture start than it was traditionally believed.
Read more: These 444 million arthropods have been implemented from the inside to the outside
Ancestral spider from the sea?
Advanced photography techniques for the search team allowed the determination of the main anatomical features in the fossilized residue of Mollyon’s sample. (Credit Image: Nick Strostfield)
Arachnids has been around about 400 million years ago, and according to the fossil registry, it seemed most of that time on the ground. But what about the first scores? Did it appear on the water or on the ground?
To answer this question, Strausfeld took a variety of precisely preserved drilling images A symmetrical softeningSearch joints of the Cambrian period, about 500 million years ago, under the different lighting conditions and enlargement. It was separated into two parts, including the extensive Carapace at the front of its body, trunk and fragmented tail at the back, it was traditionally believed that fossil species are a predecessor for horse cancer today.
But by detecting the fossilized effects of the nervous system of the sample, the pictures show this softeningThe brain and nerves are lower like those in modern horseshoe crabs and more like those in a spider or modern scorpion, instead.
According to their analysis, Strausfeld and its participating authors note that species were probably predetermined for the first chocolates, which means that spiders and scorpions originated from marine bouquets, instead of being the floor.
Read more: New joints of 450 million years have been preserved
Brain origins back
The comparison is revealed side by side to the brains of crab horse (left), the miclisonia fossil (center) and modern spider (right) about the sudden results of this study: organizing the three brain regions in Moglisuna (green, blue) inverted compared to the occurrence of horseshoe, and instead, the arrangement was found in modern offers. (Credit Image: Nick Strostfield)
So, what was about softening The nervous system, which indicated that it was close to spiders and scorpions today?
Firstly, softening I had a network of radioactive nerves that controlled the movement of multiple annexes, such as the radioactive nerve network in the gaze today. second, softening A series of short nerves that control her husband had a “claws” facing the front, similar to the nerves in the modern Anecdotes, which control her own husbands of fangs and arches. third, softeningHis brain had an inverted structure, which was not organized from front to back, as is the case in sea cancer, but from back to front, as is the case in spiders, scorpions, and other attributes.
Straosefield and its co -authors say this underdeveloped arrangement may be very useful for the first oxides, which shortens the distance between nerve control centers and their nerves. In fact, this preparation may have helped them in their speed, hide and light movement, allowing the first Arkhenids to practice impressive control over their movement that is still seen in spiders and scorpions today.
“The Angeid brain does not resemble any other brain on this planet,” Strosfield said in the statement. “It suggests that its organization is related to the arithmetic speed and control of motor procedures.”
Read more: Scientists find a 500 million years old
Hope for future excavations
Of course, similarities between softening The nervous system and the nervous system cannot represent more than just a coincidence. Therefore, to confirm that they were the result of the common asset, the researchers conducted a statistical analysis of 115 nervous features of species throughout the arthritis tree. Their analysis confirmed this softening It was closely linked to the first Arkhenids, and supported the theory that this type was predetermined by modern spiders and scorpions.
Similar samples of researchers may help restore more evolutionary history in the ARARIHNIDS in the future. Although it is rare to find samples with precisely reserved nerve systems, hope is that other types are like softening It can be explained how different articulated genealogies have led to the different stubbornness elements that climb through the terrain today.
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Sam Walters is a journalist covering archeology, excavation science, environment and development to discover, along with a variety of other topics. Before joining the Discover team as an assistant editor in 2022, Sam studied the press at Northwestern University in Ivston, Illinois.