A collaborative research group of Nagoya University, University of Wisconsin, Kochi University, Mongolian University of Science and Technology, Tohoku University, etc. I found.

 This burrow fossil is seen as a round hole from the surface of the earth (that is, the former seafloor), but the two holes are connected inside and have a "U-shaped" structure.It is presumed that the animals that form such burrows have a shape that extends back and forth, and that they have the motility to feed on the one hand and excrete on the other.In addition, it is thought that it had an activity of carving at least 2 cm below the seabed, and from this, it is presumed that it was a multicellular animal in the advanced stage with developed muscle tissue called bilaterian animal. That is.

 Until now, these fossil burrows have only been known since the Cambrian (about 5.4-5 million years ago), which is said to be the time when various marine animals evolved explosively, and Ediacaran was the time before that. From the beginning, few fossils of multicellular organisms have been produced.

 With this discovery, the "Cambrian agricultural revolution," which was previously thought to have occurred in the Cambrian period, that is, active burrow formation and seafloor disturbance by animals, began earlier in the Ediacaran period in western Mongolia. Was revealed for the first time.The results also provided strong evidence suggesting that bilaterian animals existed in the Ediacaran period.

 The explosive emergence and diversification of Cambrian animals is known as a biological mystery since Darwin.This discovery is considered to be an important finding in elucidating the actual situation of this major evolutionary event.

Paper information:[Royal Society open science] Penetrative trace fossils from the late Ediacaran of Mongolia: Early onset of the agronomic revolution

Nagoya University

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Nagoya University is a comprehensive university with 9 faculties, 13 graduate schools, 3 affiliated research institutes, nationwide joint usage, and 5 joint research centers.Through creative research activities, he explores the truth and produces some of the best intellectual achievements in the world.Foster courageous intellectuals with abundant logical thinking and imagination through educational practices that emphasize spontaneity […]

Tohoku University

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Tohoku University has a rich culture and humanity based on the tradition of "research first principle" since its opening, the idea of ​​"opening the door" and the spirit of "respect for practical science", and is a phenomenon of human beings, society and nature. In response to this, human resources with the ability to carry out intellectual exploration with a "scientific mind", demonstrating their expertise in various fields from an international perspective and leading […]

Kochi University

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As the only national university in Kochi Prefecture, it features interdisciplinary education on the region, ocean, disaster prevention, and medical care, teaches globally accepted knowledge and ideas, and contributes to the development of the region through practical activities in the region. We carry out education through "community collaboration" with the aim of developing human resources who can.Bringing the results obtained in the region to the world […]

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