Fosil yang menunjukkan asal awal gigi--T-REC-komunitas reptil-semarang--KSE-komunitas satwa eksotik

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Fosil yang menunjukkan asal awal gigi

Date:

June 24, 2015

Source:

Naturalis Biodiversity Center

Summary:

Plate  gigi kecil dari  fosil ikan berusia 410 juta tahun  Romundina stellina menunjukkan bahwa gigi berkembang sebelumnya dalam pohon kehidupan daripada yang baru diperkirakan . Rahang dan gigi telah penting ber inovasi  dalam evolusi hewan vertebrata . Lebih dari 98 % dari hewan vertebrata memiliki rahang .

............. Gigi penting dalam kehidupan kita sehari-hari , mereka sangat penting untuk mengunyah dan crunchy  makanan kita . Rahang dan gigi telah ber inovasi penting dalam evolusi hewan vertebrata . Lebih dari 98 % dari hewan vertebrata memiliki rahang .

Namun demikian kondisi awal dan asal mereka samar  dalam waktu yang lama  . Pencarian gigi fosil vertebrata berahang awal dapat benar-benar menjadi seperti mencari jarum di tumpukan jerami . Ini termasuk melihat melalui kotak penuh bit berukuran remah -potongan fosil yang tersisa setelah melarutkan batu di asam .....more

Forgotten fossil
indicates earlier origin of teeth

Date:

June 24, 2015

Source:

Naturalis Biodiversity Center

Summary:

A tiny tooth plate of the 410 million year old fossil fish Romundina
stellina indicates that teeth evolved earlier in the tree of life than recently
thought. Jaws and teeth have been important innovations in the evolution of
vertebrate animals. More than 98% of vertebrate animals have jaws.

...................

The tooth plate of just some millimeters in size had been in a box for more
than 40 years, without being recognized after the discovery and preparation of
the fish it belonged to. Palaeontologists from Naturalis Biodiversity Center,
Netherlands and the University of Bristol, United Kingdom, studied the fossil
using high energy X-rays at the Swiss Light Source at the Paul Scherrer
Institut in Switzerland, revealing the structure and development of teeth and
bones.

Their findings are published in Biology Letters.

Teeth are important in our daily life, they are crucial to munch and crunch
our food. Jaws and teeth have been important innovations in the evolution of
vertebrate animals. More than 98% of vertebrate animals have jaws.

Nevertheless earliest conditions and their origin are disguised in deep
time. The search for fossil teeth of the earliest jawed vertebrates can
literally be like the search for the needle in a haystack. This includes
looking through boxes full of crumb sized bits and pieces of fossils remaining
after dissolving rocks in acid.

Lead author, Martin Rücklin of Naturalis Biodiversity Center in Leiden
says: "We were able to visualize the finest internal structures and
distinguish tissues inside one of the first tooth plates. With powerful
computing we combined thousands of X-rays and produced computer models reconstructing
the growth of the first teeth."

Philip Donoghue from the University of Bristol in the UK explains: "We
show that the earliest teeth were like our own -- but also structured like body
scales in primitive fishes. This supports the view that teeth evolved from
scales, which arose much earlier in vertebrate evolution."

Rücklin adds: "Our results suggest that teeth originated deeper in the
tree of life than we thought. We will have to look into more basal jawed
vertebrates and also jawless fossils. Earliest jaws and teeth seem to be less
integrated than we thought and teeth look more complex than expected. I am very
happy that my research and our collaboration will be supported by the
Vidi-grant of the Netherlands Organization for Scientific Research (NWO) in the
next five years, enabling us to investigate these early stages of teeth and how
the complex system of our own jaws and teeth evolved."







Story Source:

The above post is reprinted from materials provided byNaturalis
Biodiversity Center. Note: Materials may be edited for content
and length.







Journal Reference:

1.   
M. Rucklin, P. C. J. Donoghue. Romundina and the evolutionary
origin of teeth. Biology Letters, 2015; 11 (6): 20150326
DOI: 10.1098/rsbl.2015.0326

http://www.sciencedaily.com/releases/2015/06/150624090603.htm

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