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' Anaconda ' memenuhi ' Jurassic Park ' : Fosil ular dari India yang diberi tukik dinosaurus 

Date:

March 2, 2010

Source:

University of Michigan

Summary:

Enam puluh tujuh juta tahun yang lalu , ketika tukik dinosaurus pertama  bergegas keluar dari telur mereka , itu adalah yang pertama  - dan terakhir-bagi mereka - mungkin setelah adanya rahang terbuka  dari ular dengan panjang 3,5 meter  bernama Sanajeh indicus , berdasarkan penemuan di India dari kerangka fosil yang hampir lengkap dari ular primitif yang melingkar di dalam sarang dinosaurus .

................ Sebuah tim paleontologis internasional yang dipimpin oleh University of Michigan ,Jeff Wilson dan Survei Geologi India Dhananjay Mohabey akan mempublikasikan penemuan mereka secara online 2 Maret di jurnal PLoS biologi .

Sisa-sisa ular yang hampir lengkap ditemukan awet dalam sarang dinosaurus sauropoda  dewasa yang merupakan  hewan terbesar yang diketahui hidup di bumi . Ular itu melingkar di sekitar telur yang baru menetas dan berdekatan dengan tukik sauropod..............more

'Anaconda' meets 'Jurassic Park': Fossil snake from
India fed on hatchling dinosaurs

Date:

March 2, 2010

Source:

University of Michigan

Summary:

Sixty-seven million years ago, when
dinosaur hatchlings first scrambled out of their eggs, their first -- and last
-- glimpse of the world might have been the open jaws of a 3.5-meter-long snake
named Sanajeh indicus, based on the discovery in India of a nearly complete
fossilized skeleton of a primitive snake coiled inside a dinosaur nest.

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

The remains of an extraordinary fossil
unearthed in 67-million-year-old sediments from Gujarat, western India provide
a rare glimpse at an unusual feeding behavior in ancient snakes.

An international paleontological team
led by the University of Michigan's Jeff Wilson and the Geological Survey of
India's Dhananjay Mohabey will publish their discovery online March 2 in the
open-access journal PLoS Biology.

The remains of a nearly complete snake
were found preserved in the nest of a sauropod dinosaur, adults of which are
the largest animals known to have walked the earth. The snake was coiled around
a recently hatched egg adjacent to a hatchling sauropod. Remains of other snake
individuals associated with egg clutches at the same site indicate that the
newly described snake made its living feeding on young dinosaurs.

"It was such a thrill to discover
such a portentous moment frozen in time," said Mohabey, who made the
initial discovery in the early 1980s.

Working with the sediment-covered and
inscrutable specimen in 1987, Mohabey recognized dinosaur eggshell and limb
bones but was unable to fully interpret the specimen. In 2001, Wilson visited
Mohabey at his office at the Geological Survey of India and was astonished when
he examined the specimen.

"I saw the characteristic vertebral
locking mechanism of snakes alongside dinosaur eggshell and larger bones, and I
knew it was an extraordinary specimen---but I also knew we needed to develop it
further," Wilson said.

From that point began a decade-long
odyssey that led to a formal agreement with the Government of India Ministry of
Mines in 2004 that allowed preparation and study of the fossil at the U-M
Museum of Paleontology, weeks of museum study in India, and field
reconnaissance at the original locality in Gujarat by a team that included
Wilson, Mohabey, snake expert Jason Head of the University of
Toronto-Mississaugua, and geologist Shanan Peters of the University of
Wisconsin. The field research was funded by the National Geographic Society.

Preparation of the fossil at the U-M
revealed the snake was coiled around a crushed dinosaur egg next to a freshly
hatched sauropod dinosaur.

"We think that the hatchling had
just exited its egg, and that activity attracted the snake," said Mohabey.
"The eggs were lain in the loose sands near a small drainage and covered
by a thin layer of sediment."

The arrangement of the bones and
delicate structures, such as eggshells and the snake's skull, point to quick
entombment.

"Sedimentation was unusually rapid
and deep for this formation---a pulse of sand, probably mobilized during a
storm, resulted in the preservation of this spectacular association," said
Peters, who interpreted the paleoenvironment of the site.

The new snake, which was named Sanajeh
indicus or "ancient-gaped one from the Indian subcontinent," because
of its lizard-like gape, adds critical information that helps resolve the early
diversification of snakes. Modern large-mouthed snakes are able to eat large
prey because they have mobile skulls and wide gapes. Sanajeh bears only some of
the traits of modern large-mouthed snakes and provides insight into how they
evolved.

"Sanajeh was capable of ingesting
the half meter-long sauropod hatchling because it was quite large itself,
almost 3.5 meters long," Head said. "This points to an interesting
evolutionary strategy for primitive snakes to eat large prey by increasing
their body size."

Although the sauropod dinosaurs that
Sanajeh preyed upon include the largest animals capable of walking on land,
they began their life as small hatchlings that were about one-seventh the
length of Sanajeh. Sauropods appear to have achieved their enormous size by
virtue of a fast-growth phase, which would have kept them out of danger from
Sanajeh-sized predators by the end of their first year of life.

This discovery of Sanajeh adds to a
growing body of evidence suggesting that the Indian subcontinent retained ties
to southern landmasses for longer than once hypothesized. Sanajeh's closest
relatives are from Australia and speak to its strong ties to southern
continents, collectively known as Gondwana.

A life-sized flesh reconstruction of the
scene immediately before burial was designed and executed by University of
Chicago paleoartist Tyler Keillor. The team will donate the first cast to the Geological
Survey of India at a formal function to be held in Mumbai, India, on March 12,
2010.










Story Source:

The above post is reprinted from materials provided byUniversity of Michigan. Note: Materials may be edited for content and length.










Journal Reference:

1.    Wilson JA, Mohabey DM, Peters SE, Head JJ. Predation upon Hatchling
Dinosaurs by a New Snake from the Late Cretaceous of India. PLoS
Biology, 2010; 8(3): e1000322 DOI: 10.1371/journal.pbio.1000322

http://www.sciencedaily.com/releases/2010/03/100301201941.htm

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