A microscopic artifact no larger than a sesame seed, which is already 520 million years old, was found in China.
This information is provided by the Science Alert resource, reports URA-Inform.
We are not just talking about an ancient find, but about the larva of a new genus and species of euarthropods, known as Youti yuanshi. But this larva amazed scientists not only with its antiquity.
Preservation and significance of the find
The larva was preserved in excellent condition, with almost all of its internal anatomy intact. This organism was the ancestor of modern arthropods, such as spiders, crabs, and insects. The fossil found can shed light on the evolution of these creatures, which now inhabit the entire planet.
Research methods and 3D reconstruction
The fossil was found in shale rocks of the Yuanshan Formation. Acetic acid was used to extract it, and then high-resolution scans were performed to study its internal structures. Despite its tiny size, the detailed images showed the larva's textured skin, head, and legs. X-ray tomography allowed scientists to examine intact anatomy, including the brain, digestive glands, circulatory system, and nervous system.
Contributions to evolutionary biology
This larva represents a rare stage of arthropod development that is rarely found in the fossil record. Scientists believe that Y. yuanshi may provide important information about the development of this type of animal. The protocerebrum, the brain region of the worm, contains elements that foreshadow the more complex cranial anatomy that developed in arthropods. The circulatory and digestive systems of Y. yuanshi may also be related to the subsequent development of these functions in modern arthropods.
A look back at the future
Although the worm looks primitive compared to modern animals, its anatomy contains hints about future evolution. This discovery helps scientists understand how complex biological systems developed in arthropods and what changes occurred over hundreds of millions of years.
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