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Buaya purba  bersaing dengan Titanoboa , ular terbesar di dunia, untuk makanan ,temuan  ahli paleontologi

Date:

September 16, 2011

Source:

University of Florida

Summary:

Dalam sebuah studi baru , para peneliti menggambarkan spesies punah 20 - kaki  yang ditemukan di tambang batubara Kolombia yang sama dengan Titanoboa , ular terbesar di dunia . Temuan membantu para ilmuwan untuk lebih memahami keragaman hewan yang menduduki ekosistem hutan hujan tertua , yang memiliki suhu yang lebih tinggi dari hari ini , dan dapat berguna untuk memahami dampak dari iklim yang lebih hangat di masa depan .

................. Dalam sebuah studi baru muncul 15 September di jurnal paleontologi , University of Florida peneliti menggambarkan spesies punah 20 - kaki  yang ditemukan di tambang batubara Kolombia yang sama dengan Titanoboa , ular terbesar di dunia . Temuan yang membantu para ilmuwan untuk lebih memahami keragaman hewan yang menduduki ekosistem hutan hujan tertua , yang memiliki suhu yang lebih tinggi dari hari ini , dan dapat berguna untuk memahami dampak dari iklim yang lebih hangat di masa depan ....more

Ancient crocodile competed with Titanoboa, world's
largest snake, for food, paleontologists discover

Date:

September 16, 2011

Source:

University of Florida

Summary:

Did an ancient crocodile relative give
the world's largest snake a run for its money? In a new study, researchers
describe a new 20-foot extinct species discovered in the same Colombian coal
mine with Titanoboa, the world's largest snake. The findings help scientists
better understand the diversity of animals that occupied the oldest known rainforest
ecosystem, which had higher temperatures than today, and could be useful for
understanding the impacts of a warmer climate in the future.

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

Did an ancient crocodile relative give
the world's largest snake a run for its money?

In a new study appearing Sept. 15 in the
journal Palaeontology, University of Florida researchers describe a
new 20-foot extinct species discovered in the same Colombian coal mine with
Titanoboa, the world's largest snake. The findings help scientists better understand
the diversity of animals that occupied the oldest known rainforest ecosystem,
which had higher temperatures than today, and could be useful for understanding
the impacts of a warmer climate in the future.

The 60-million-year-old freshwater
relative to modern crocodiles is the first known land animal from the Paleocene
New World tropics specialized for eating fish, meaning it competed with
Titanoboa for food. But the giant snake could have consumed its competition,
too, researchers say.

"The younger individuals were
definitely not safe from Titanoboa, but the biggest of these species would have
been a bit much for the 42-foot snake to handle," said lead author Alex
Hastings, a graduate student at the Florida Museum of Natural History and UF's department
of geological sciences.

The new species is a dyrosaurid,
commonly believed to be primarily ocean-dwelling, coastal reptiles. The new
adult specimens challenge previous theories the animals only would have entered
freshwater environments as babies before returning to sea.

Fossils of a partial skeleton of the
species, Acherontisuchus guajiraensis, show dyrosaurids were key players in
northeastern Colombia and that diversity within the family evolved with
environmental changes, such as an asteroid impact or the appearance of
competitors from other groups, said Christopher Brochu, an associate professor
of vertebrate paleontology in the department of geoscience at the University of
Iowa, who was not involved in the study.

"We're facing some serious
ecological changes now," Brochu said. "A lot of them have to do with
climate and if we want to understand how living things are going to respond to
changes in climate, we need to understand how they responded in the past. This
really is a wonderful group for that because they managed to survive some
catastrophes, but they seemed not to survive others and their diversity does
seem to change along with these ecological signals."

The species is the second ancient
crocodyliform found in the Cerrejon mine of northern Colombia, one of the
world's largest open-pit coal mines. The excavations were led by study
co-authors Jonathan Bloch, Florida Museum associate curator of vertebrate
paleontology, and paleobotanist Carlos Jaramillo of the Smithsonian Tropical
Research Institute.

"This one is related to a group
that typically had these long snouts" Hastings said. "It would have
had a relatively similar diet to the other (coastal) species, but surprisingly
it lived in a more freshwater environment."

The genus is named for the river Acheron
from Greek mythology, "the river of woe," since the animal lived in a
wide river that emptied into the Caribbean. Unlike the first crocodile relative
found in the area, which had a more generalized diet, the snout of the new
species was long, narrow and full of pointed teeth, showing a specialization
for hunting the lungfish and relatives of bonefish that inhabited the water.

"The general common wisdom was that
ancestrally all crocodyliforms looked like a modern alligator, that all of
these strange forms descended from a more generalized ancestor, but these guys
are showing that sometimes one kind of specialized animal evolved from a very
different specialized animal, not a generalized one," Brochu said.
"It's really showing us a level of complexity to the history that 10 years
ago was not anticipated."

During the Paleocene in South America,
the environment was dominated by reptiles, including giant snakes, turtles and
crocodiles. The dyrosaurid family originated in Africa about 75 million years
ago, toward the end of the age of dinosaurs, and arrived in South America by
swimming across the Atlantic Ocean.

"The same thing that snuffed out
the dinosaurs killed off most of the crocodiles alive at the time,"
Hastings said. "The dyrosaurids are one of the few groups to survive the
extinction and later become more successful."







Story Source:

The above post is reprinted from materials provided byUniversity of Florida. The original item was written by Danielle Torrent. Note:
Materials may be edited for content and length.







Journal Reference:

1.    Alexander K. Hastings, Jonathan I. Bloch, Carlos A. Jaramillo. A
New Longirostrine Dyrosaurid (Crocodylomorpha, Mesoeucrocodylia) from the
Paleocene of North-Eastern Colombia: Biogeographic and Behavioural Implications
for New-World Dyrosauridae. Palaeontology,, 2011; 54 (5):
1095-1116 DOI: 10.1111/j.1475-4983.2011.01092.x

http://www.sciencedaily.com/releases/2011/09/110914192308.htm

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