絶滅した巨大カモノハシの歯を発見、豪州


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The fossil of the tooth of the huge duckbill regarded as it having been on November 5 1 meter whose length is twice the existing kind in northeastern AFP] Australia was discovered.
The scientists concerned with discovery are the papers published at the U.S. academic journal “backbone extinct-organisms journal (Journal of Vertebrate Palaeontology)” on the 5th, and are expressing it as “a huge duckbill like Godzilla.”
? — the fossil of this extinct species was discovered in world heritage famous as an area which many fossils excavate, and the Australian northeast part Queensland (Queensland) state reverse lei (Riversleigh).
It is a kind which is not discovered until now and named “Obdurodon tharalkooschild.”
■ New truth which is in sight from a dental fossil
The duckbill of which ? existing is done inhabits eastern Australia.
There is no tooth for the cowardly nocturnal animal which lives in the deep hole of the waterside.
On the other hand, it is said that it is one, and it is very large and the tooth of the extinct species found this time is powerful.
According to Professor Mike Archer (Mike Archer) of an Australian New South Wales university (University of New South Wales), it is concluded from the size of this tooth that the length was about 1 meter, the twice of an existing kind.
It has been thought that the duckbill having the feature of ? birds, the mammals, and reptiles lost the tooth, and was miniaturized over the long time of millions of old years.
But, this discovery reverses an established theory.
Scientists consider that this extinct species is not a direct ancestor of an existing kind.
Professor ? Archer “a new type of discovery was shocking.
The evolutionary lineage tree of the duckbill was regarded as about 1 straight line from the fossil found so far.
It is said that however, the branch which was not expected existed in the genealogical tree now, and it turned out that some kinds of the branch system grew large.”
■ At the crisis of extinction of an existing duckbill
Like the existing kind, ? extinct species is an aquatic animal mostly, and is regarded as having lived on the outskirts of freshwater of Mori who had covered the reverse lei area hundreds of years of ago.
If a small vertebrate called a freshwater crustacean, frogs, and jars, such as a crayfish, was probably used as food, Mr. Suzanne Hand (Suzanne Hand) of the department of the New South Wales large living thing geoenvironmental science will say.
About a possibility that it can survive in the long run from now on also, we have so far been anxious about the duckbill of which ? existing is done.
Professor Archer indicates that this discovery is what accelerates the concern.
What discovery shows only says, “The kind of the exterminated duckbill is having further been now.”
(c)AFP
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