Do you Know what unites the 99% of currently known living beings, including humans? They all have a feature known as bilateral symmetry — their bodies can be divided into left and right sides, which are virtually identical. In addition, the body of the majority of today's organisms starts with the head and ends, callous as it may sound, the anus. Recently, an international group of scientists found in stone rock, the remains of an ancient animal, which was given the name Ikaria wariootia. It had the shape of a small worm the size of a grain of rice, and also has a bilateral symmetric body with the head, digestive system and anus. The researchers believe that it took from him a large part of today's living organisms.
Bilateral symmetry — a feature of the structure of animals, in which they have a mouth and anus. This feature is in 99% of living beings, except for living under water. jaw, marine jellyfish moving with the help of tiny cilia ctenophores and colourless plate marine animals.
In the order shown: sea sponge, jellyfish, ctenophore and animal plate
Creature called Ikaria wariootia lived about 555 million years ago, in ediacaran period. Then our planet , which lived in water and were almost stationary way of life. But the animal was found, judging by his sophisticated by the standards of those times the building was very active. Its body length ranged from 2 to 7 millimeters, and the width does not exceed 2.5 millimeters. The structure of the body of an ancient slug is symmetrical, moreover, the scientists had found signs of the presence of the mouth, digestive system and anus.
the Ancient slug Ikaria wariootia in the representation of the artist
To Detect traces of so ancient and tiny animal was quite difficult. About its existence, scientists have suspected in the course of studying ancient rocks, located on the territory of modern Australia. The researchers noticed that some fragments of the stones have small holes oval. They were all about the same shape and inside those holes a long time ago clearly somebody was crawling. It turns out that while the other creatures of the ediacaran period motionless on the bottom, slick Ikaria wariootia actively moving muscles and was one of the most active animals of those times.
the Remains of animals that lived hundreds of millions of years ago, it is difficult to detect because of their lack of a hard shell.
Currently, Ikaria wariootia is considered the first animal, the body of which possess bilateral symmetry. Apparently, this structure of organisms has been so successful from an evolutionary point of view, that it was preserved for hundreds of millions of years. Once upon a time this feature went to the first amphibious creatures and then passed on to the dinosaurs, the monkeys and, eventually, even us. As mentioned, today bilateral symmetry have a 99% of living beings on our planet.
Traces of an ancient animal was discovered in one of the rocks of Australia
This discovery is very important and valuable to the scientific community, because the traces of lived hundreds of millions of years ago animals are discovered by paleontologists very rarely. And the thing is that in those days they did not have time to develop a hard shell. Therefore, scientists often study the remaining ancient times stones, hoping to find in them traces of any organisms. Often, as in the case of Ikaria wariootia, they notice the mink left by the extinct organisms.
We often write about the remains of ancient creatures, so if you are interested in this article, and you will not want to miss the new material on the subject
In recent years, scientists make many such discoveries. For example, recently in Canada was found the skeleton of fish elpistostege, which became the first in the history of our planet, the owner of these fingers. It is believed that this fish used the fingers to from time to time choose of water to the land. To read more about it in our video, which shows an exterior view of this amazing creation.
as it turns out — the ancestor of bears and many animals is a tiny slug?
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