Buaya purba kemungkinan sumber makanan untuk Titanoboa , ular terbesar yang pernah dikenal--T-REC-komunitas reptil-semarang--KSE-komunitas satwa eksotik

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Buaya purba  kemungkinan sumber  makanan untuk Titanoboa , ular terbesar yang pernah dikenal

Date:

February 3, 2010

Source:

University of Florida

Summary:

Se ekor  kerabat 60 - juta tahun dari buaya adalah kemungkinan sumber makanan bagi Titanoboa , ular terbesar di dunia yang pernah dikenal . Ahli paleontologi menemukan fosil spesies  buaya purba di Formasi Cerrejon di Kolombia utara.sebuah  Situs , salah satu tambang batu bara terbesar open- pit di dunia, yang juga menghasilkan kerangka raksasa , boa constrictor seperti Titanoboa , yang diukur panjang hingga  45 kaki  .

....................... Bekerja dengan para ilmuwan dari Smithsonian Tropical Research Institute di Panama , ahli paleontologi dari Florida Museum of Natural History di kampus UF menemukan fosil spesies baru buaya purba di Formasi Cerrejon di Kolombia utara....more

Ancient
crocodile relative likely food source for Titanoboa, largest snake ever known

Date:

February 3, 2010

Source:

University of Florida

Summary:

A 60-million-year-old relative of crocodiles was likely a food source for
Titanoboa, the largest snake the world has ever known. Paleontologists found
fossils of the new species of ancient crocodile in the Cerrejon Formation in
northern Colombia. The site, one of the world's largest open-pit coal mines,
also yielded skeletons of the giant, boa constrictor-like Titanoboa, which
measured up to 45 feet long.

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

A 60-million-year-old relative of crocodiles described recently by
University of Florida researchers in the Journal of
Vertebrate Paleontology was likely a food source for Titanoboa, the
largest snake the world has ever known.

Working with scientists from the Smithsonian Tropical Research Institute in
Panama, paleontologists from the Florida Museum of Natural History on the UF
campus found fossils of the new species of ancient crocodile in the Cerrejon
Formation in northern Colombia. The site, one of the world's largest open-pit
coal mines, also yielded skeletons of the giant, boa constrictor-like
Titanoboa, which measured up to 45 feet long. The study is the first report of
a fossil crocodyliform from the same site.

"We're starting to flesh out the fauna that we have from there,"
said lead author Alex Hastings, a graduate student at the Florida Museum and
UF's department of geological sciences.

Specimens used in the study show the new species, namedCerrejonisuchus
improcerus, grew only 6 to 7 feet long, making it easy prey for Titanoboa.
Its scientific name means small crocodile from Cerrejon.

The findings follow another study by researchers at UF and the Smithsonian
providing the first reliable evidence of what Neotropical rainforests looked
like 60 million years ago.

While Cerrejonisuchus is not directly related to modern crocodiles, it
played an important role in the early evolution of South American rainforest
ecosystems, said Jonathan Bloch, a Florida Museum vertebrate paleontologist and
associate curator.

"Clearly this new fossil would have been part of the food-chain, both
as predator and prey," said Bloch, who co-led the fossil-hunting
expeditions to Cerrejon with Smithsonian paleobotanist Carlos Jaramillo.
"Giant snakes today are known to eat crocodylians, and it is not much of a
reach to say Cerrejonisuchus would have been a frequent meal for Titanoboa.
Fossils of the two are often found side-by-side."

The concept of ancient crocodyliforms as snake food has its parallel in the
modern world, as anacondas have been documented consuming caimans in the
Amazon. Given the ancient reptile's size, it would have been no competition for
Titanoboa, Hastings said.

Cerrejonisuchus improcerus is the smallest member of
Dyrosauridae, a family of now-extinct crocodyliforms. Dyrosaurids typically
grew to about 18 feet and had long tweezer-like snouts for eating fish. By
contrast, the Cerrejon species had a much shorter snout, indicating a more generalized
diet that likely included frogs, lizards, small snakes and possibly mammals.

"It seems that Cerrejonisuchus managed to tap into a feeding resource
that wasn't useful to other larger crocodyliforms," Hastings said.

The study reveals an unexpected level of diversity among dyrosaurids, said
Christopher A. Brochu, a paleontologist and associate professor in geosciences
at the University of Iowa.

"This diversity is more evolutionarily complex than expected,"
said Brochu, who was not involved in the study. "A limited number of snout
shapes evolved repeatedly in many groups of crocodyliforms, and it appears that
the same is true for dyrosaurids. Certain head shapes arose in different
dyrosaurid lineages independently."

Dyrosaurids split from the branch that eventually produced the modern
families of alligators and crocodiles more than 100 million years ago. They
survived the major extinction event that killed the dinosaurs but eventually
went extinct about 45 million years ago. Most dyrosaurids have been found in
Africa, but they occur throughout the world. Prior to this finding, only one
other dyrosaurid skull from South America had been described.

Scientists previously believed dyrosaurids diversified in the Paleogene,
the period of time following the mass extinction of dinosaurs, but this study
reinforces the view that much of their diversity was in place before the mass
extinction event, Brochu said. Somehow dyrosaurids survived the mass extinction
intact while other marine reptile groups, such as mosasaurs and plesiosaurs,
died out completely.

The crocodyliform's diminutive size came as a surprise, Hastings said,
especially considering the giant reptiles that lived during the Late
Cretaceous. The fossil record also points to the possibility of other types of
ancient crocodyliforms inhabiting the same ecosystem. "In a lot of these
tropical, diverse ecosystems in which crocodyliforms can thrive, you often see
multiple snout types," he said. "They tend to start speciating into
different groups."







Story Source:

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

http://www.sciencedaily.com/releases/2010/02/100202154408.htm

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