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Ilmu pengetahuan dan seni membawa kembali ke kehidupan spesimen reptil 300 - juta - tahun  - seperti vertebrata primitif

Ahli paleontologi telah recreated  struktur tengkorak dari kadal -  308 - juta tahun...seperti vertebrata  yang bisa menjadi contoh paling awal dari reptil dan menjelaskan asal-usul semua vertebrata yang termasuk reptil , burung dan mamalia .....read more

Science and art bring back to life
300-million-year-old specimens of a primitive reptile-like vertebrate

Date:

July 21, 2014

Source:

University of Lincoln

Summary:

Paleontologists have recreated the cranial structure of a
308-million-year-old lizard-like vertebrate that could be the earliest example
of a reptile and explain the origin of all vertebrates that belong to reptiles,
birds and mammals.

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

Paleontologists from
the Natural History Museum and academics from Lincoln, Cambridge and Solvakia
have recreated the cranial structure of a 308-million-year-old lizard-like
vertebrate that could be the earliest example of a reptile and explain the
origin of all vertebrates that belong to reptiles, birds and mammals.

Dr Marcello Ruta, from the School of Life Sciences, University of Lincoln,
UK, was one of the authors of the paper which is published in the Journal of
Vertebrate Paleontology and produced a series of intricate hand-drawn
recreations of the cranial structure of Gephyrostegus.

Paleontologists have provided a new cranial reconstruction of a
long-extinct limbed vertebrate (tetrapod) from previously unrecognised
specimens found in coal deposits from the Czech Republic.

The team of academics reviewed the cranial structural features of the Late
Carboniferous Gephyrostegus bohemicus -- a small animal
of generally lizard-like build that lived 308 million years ago.

This early tetrapod could be the earliest example of a reptile and explain
the origin of amniotes, all vertebrates that belong to reptiles, birds and
mammals.

Experts from, Comenius University in Bratislava (Slovakia), University
Museum of Zoology in Cambridge, The Natural History Museum in London, and the
University of Lincoln, UK, have been able to study additional specimens
unavailable in previous works.

Their aim was to provide an analysis of early tetrapod relationships
incorporating their new observations ofGephyrostegus. Their analysis
used skeletal traits across a sample of early tetrapod groups to identify the
likely affinities ofGephyrostegus.

Their results are detailed in the Journal of Vertebrate
Paleontology.

Dr Marcello Ruta, from the School of Life Sciences, University of Lincoln,
UK, was one of the authors and produced a series of intricate hand-drawn
recreations of the cranial structure ofGephyrostegus.

He explained: "Gephyrostegus has always been an elusive
beast. Several researchers have long considered the possibility that the
superficially reptile-like features of this animal might tell us something
about amniote ancestry. But Gephyrostegus also shows some much
generalised skeletal features that make the issue of its origin even more
problematic. We conducted a new study that brings together data from a large
number of early tetrapods. The study shows that Gephyrostegus is
closely related to another group of Eurasiatic and North American tetrapods
called seymouriamorphs, also involved in debates about amniote ancestry. We
found some interesting new cranial features in Gephyrostegus that
helped us establish this link.

"Staring at specimens for a long time down a microscope and trying to
make sense of their anatomy may be frustrating and tiring at times, but always
immensely rewarding."







Story Source:

The above story is based on materials provided by University
of Lincoln. Note: Materials may be edited for content and length.







Journal Reference:

1.   
Jozef Klembara, Jennifer A. Clack, Andrew R. Milner, Marcello Ruta. Cranial
anatomy, ontogeny, and relationships of the Late Carboniferous
tetrapodGephyrostegus bohemicusJaekel, 1902.Journal of Vertebrate
Paleontology, 2014; 34 (4): 774 DOI:10.1080/02724634.2014.837055

 sumber

http://www.sciencedaily.com/releases/2014/07/140721123739.htm

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