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reptil kuno diawetkan dalam fosil : fosil  Ichthyosaur  menunjukkan  kelahiran hidup  reptil tertua

Ichthyosaurus ....reptil laut raksasa yang berevolusi dari reptil tanah dan pindah ke air . Para ilmuwan melaporkan spesimen fosil baru  Chaohusaurus ( Reptilia , Ichthyopterygia ) , yang tertua dari reptil laut Mesozoikum yang hidup sekitar 248 juta tahun yang lalu . Kerangka parsial itu recovered  di Cina dan dapat menunjukkan ....read more

Ancient reptile birth preserved in
fossil: Ichthyosaur fossil may show oldest live reptilian birth

Date:

February 12, 2014

Source:

PLOS

Summary:

Ichthyosaurs were giant marine reptiles that evolved from land reptiles and
moved to the water. Scientists report a new fossil specimen that belongs to
Chaohusaurus (Reptilia, Ichthyopterygia), the oldest of Mesozoic marine
reptiles that lived approximately 248 million years ago. The partial skeleton
was recovered in China and may show a live birth.

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

An ichthyosaur fossil
may show the earliest live birth from an ancient Mesozoic marine reptile,
according to a study published February 12, 2014 in PLOS ONE by Ryosuke Motani from the University of
California, Davis, and colleagues.

Ichthyosaurs were giant marine reptiles that evolved from land reptiles and
moved to the water. Scientists report a new fossil specimen that belongs
to Chaohusaurus (Reptilia, Ichthyopterygia), the oldest of
Mesozoic marine reptiles that lived approximately 248 million years ago. The
partial skeleton was recovered in China and may show a live birth. The maternal
skeleton was associated with three embryos and neonates: one inside the mother,
another exiting the pelvis-with half the body still inside the mother-and the
third outside of the mother. The headfirst birth posture of the second embryo
indicates that live births in ichthyosaurs may have taken place on land,
instead of in the water, as some studies have previously suggested.

The new specimen may contain the oldest fossil embryos of Mesozoic marine
reptile, about 10 million years older than those indicated on previous records.
The authors also suggest that live births in land reptiles may have appeared
much earlier than previously thought.

Dr. Motani added, "The study reports the oldest vertebrate fossil to
capture the 'moment' of live-birth, with a baby emerging from the pelvis of its
mother. The 248-million-year old fossil of an ichthyosaur suggests that
live-bearing evolved on land and not in the sea."










Story Source:

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










Journal Reference:

1.   
Ryosuke Motani, Da-yong Jiang, Andrea Tintori, Olivier Rieppel, Guan-bao
Chen. Terrestrial Origin of Viviparity in Mesozoic Marine Reptiles
Indicated by Early Triassic Embryonic Fossils. PLoS ONE, 2014;
9 (2): e88640 DOI: 10.1371/journal.pone.0088640


sumber


http://www.sciencedaily.com/releases/2014/02/140212183700.htm

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