One of the most ancient ancestors of animals and humans was similar to the "toothy bag"
Paleontologists have joined the family album of mankind another image of our probable ancestor. Perhaps the oldest one found at the moment. Examining discovered in one of Shanghai province (China) 45 ancient fossils, no larger than a grain of rice, the researchers concluded that these fossils belong to a previously unknown species of living organisms and, moreover, to what extent are the ancient ancestors of animals and humans.
detection creatures gave the name Saccorhytus coronaries. They look like a "toothy bag", as can be seen by looking at the image above and below. It is believed that these tiny vertebrate ancestors were marine life and living in the era of the Cambrian period, about 540 million years ago. Their detection allows to fill gaps in the evolutionary chain group multicellular organisms called deuterostome. Such beings in the process of embryonic development is formed first the anus and then the mouth. This group, along with starfish, sea urchins, sea cucumbers and class Enteropneusta animals are including animal closest to man, and the man himself. During the Cambrian period, these primitive deuterostome quickly divided into a huge number of diverse groups. Prove the existence of such ancient organisms found in the past - in the rock, dating back 510-520 million years - but marked differences between groups, coupled with their rapid division made it difficult to understand how it could look very first deuterostome. With this same opening pattern for paleontologists it became much clearer.
In certain extent symmetrical fossil millimeter length may resemble scary masks. The biggest hole in the middle, most likely, was the mouth of the animal. All signs indicate that this pipsqueak could disclose it very well and thus to catch a very large size of its prey. Available folds on the surface may indicate that the animal has a very thin skin and muscle tissue that enabled him to move around and dig and get out of the sand seabed. Numerous protruding appendages with openings, it may have played a role nares and allowed to release excess water and waste products. The researchers also suggest that these holes could also be a kind of prehistoric prototype pharyngeal slits, later became the gills of fish and eventually acquired the form with you our modern ears.
"We think that this kind of deuterostome may be the most primitive form of this group, which was subsequently divided into many subtypes, and initiated the development of a variety of other groups, including the one that includes people. To the naked eye, these fossils may seem simple tiny black grains, but under a microscope level of detail is simply incredible. Deuterostome all had a common ancestor, and we think that we are just at it and see, "- explains the researcher Simon Conway Morris of Cambridge University.
The researchers also point out that it is unlikely we will be able to accurately draw a line of our ancestry until Saccorhytus coronaries, as in a conventional sense of this amazing animal is rather our "very old aunt," bathed "very old grandmother."