古代の小型サメ、大量絶滅を生き延びていた可能性 研究


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[October 30 AFP] kind fellows of the small shark considered to have become extinct in “mass extinction” incident of the earth generated about 250 million years ago, The report of research that the fossil of the minimum tooth in which having survived for 120 million more years after that in fact is shown was discovered was published in English Science journal Nature Communications (Nature Communications) on the 29th.
According to the paper which the joint research team of the Natural History Museum (Natural History Museum) in ? Switzerland Geneva (Geneva) and a French Montpellier university (University of Montpellier) announced, in the length of about 30 cm, It is said that possibly this strange living thing considered that the key-like projection was attached instead of the dorsal fin survived the extinction incident by hiding the body to deep sea.
In the worst mass extinction incident in the ground which occurred in the end of ? ペルム 紀 (Permian era), about 70% of land living things became extinct about 95% of marine organisms.
It is thought that one continent surrounded by the one sea existed in the earth of those days.
? — about the cause which caused this destructive phenomenon, the earth is covered with the particulates generated in the collision of the asteroid, and there are an opinion carried out to since sunlight was interrupted and the plant became extinct and an opinion carried out to since the fatal double pain state of acid rain and global warming occurred by intensified volcanic activity.
The shark of the Cladodontomorph kind which asks the far relative of the shark of ? present age was also considered to be one of the living things which disappeared by mass extinction.
This shark had a jaw with which the several rows sharp minimum tooth is located in a line.
? research team is a deposition stratum of the Cretaceous (Cretaceous period) in the town Montpellier (Montpellier) suburbs in southern France, and discovered six teeth of this kind of shark.
It seems that this area was that time and the seabed.
This tooth of the size which is less than ?2 mm belongs to three kinds of different Cladodontomorph kinds, and it means that this exterminated shark had survived till about 135 million years before now.
? paper says, “While the destructive phenomenon has occurred, this race has a high possibility of having survived mass extinction by using the refuge environment of deep sea.”
(c)AFP
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