Paleonews

Il blog dedicato ai Paleontologi !!!!

2009-02-17 – Panphagia Protos: il primo dinosauro onnivoro (earliest onnivore dinosaur)

go to the free access scientific article:

 A Basal Sauropodomorph (Dinosauria: Saurischia) from the Ischigualasto Formation (Triassic, Carnian) and the Early Evolution of Sauropodomorpha

vei appofondimenti sui blog:

Theropoda: Panphagia protos (Martinez & Alcober, 2009), Eoraptor e l’origine dei theropodi

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ARGENTINA: SCOPERTO DINOSAURO ‘ANELLO MANCANTE’ EVOLUZIONE

(ANSA) – BUENOS AIRES, 16 FEB – Nel parco naturale argentino di Ichigualasto e’ stato ritrovato lo scheletro di un dinosauro di piccole dimensioni, identificato come il primo ‘dino’ onnivoro ad aver vissuto sulla terra ed anello mancante, affermano gli archeologi di Buenos Aires, tra i bipedi carnivori e i colossi erbivori a quattro zampe. E’ stato battezzato Panphagia Protos (‘il primo a mangiare tutto’), e’ di dimensioni piccole (misura circa un metro e mezzo di lunghezza) ed il suo scopritore, Ricardo Martinez, lo definisce quale l’anello mancante grazie al quale la scienza potra’ completare le tappe evolutive che portarono all’avvento sul pianeta di ‘erbivori mostruosi’ di dimensioni enormi, capaci di consumare tonnellate di alimenti vegetali al giorno. Il Panphagia, che presenta una dentatura adatta a consumare sia carne sia piante, dimostra che l’evoluzione di animali grandissimi, come per esempio il brontosauro, incomincio’ molto prima di quanto si fosse ipotizzato finora, ossia circa 225 milioni di anni fa, praticamente in corrispondenza con l’avvento dei dinosauri stessi sulla Terra. La scoperta e’ stata effettuata qualche tempo fa all’interno parco naturale argentino di Ichigualasto, nella provincia di San Juan, un luogo soprannominato ‘la culla dei dinosauri’ per la sua ricchezza di reperti ossei: e’ infatti lo stesso luogo in cui nel 1991 fu ritrovato l’Eoraptor Lunensis, secondo vari scienziati, il piu’ antico dinosauro mai recuperato. (ANSA). JFC-RIG
16/02/2009 20:02

fonte: http://www.ansa.it/ambiente/notizie/notiziari/natura/20090216200234826092.html

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Missing dinosaur link found in Argentina

BUENOS AIRES (AFP) — Scientists have found fossil remains of an omnivorous dinosaur in Argentina — a missing link to the carnivores, a researcher said Monday.

“It is an omnivore — in other words it ate everything (plants and meat) — which is the missing link between carnivorous dinosaurs and giant four-footed herbivores,” said Oscar Alcober, also director of the Natural Sciences Museum in San Juan, 1,200 kilometers (745 miles) west of Buenos Aires.

“This is a very important piece of the puzzle on the origin of dinosaurs,” said Alcober.

Alcober and Ricardo Martinez, chief of the museum’s paleontology division, found the remains three years ago in the Ischigualasto-Valle de la Luna park, north of the provincial capital San Juan. They released their findings Monday in the online journal of peer reviewed science PlosOne.org.

Argentina has earned fame as a bit of a Jurassic Park in the 1980s with discoveries including fossils in Neuquen of the Argentinosaurus Huinculensis, the largest known herbivore, at over 40 meters (131 ft) long.

Later, in 1993, scientists found remains of the Giganotosaurus Carolinii, the largest known carnivorous dinosaur amid dozens of fossil fields still being explored.

source:  http://www.google.com/hostednews/afp/article/ALeqM5jIDsA9kMjE-ZKmBcZ5hmtlToPjqw

A Basal Sauropodomorph (Dinosauria: Saurischia) from the Ischigualasto Formation (Triassic, Carnian) and the Early Evolution of Sauropodomorpha

Ricardo N. Martinez, Oscar A. Alcober

febbraio 17, 2009 Posted by | - R. Dinosauri, 1, 3 Triassico, America Southern, Articolo sc. di riferimento, Bl - Top posts, Blogs, FREE ACCESS, Lang. - Italiano, Mesozoic, P - Evoluzione, P - Ritrovamenti fossili, Paleontology / Paleontologia, Theropoda | , , , , , , , | Lascia un commento

2008-09-30 – Scoperto dinosauro carnivoro che respirava come uccelli odierni (Aerosteon riocoloradensis gen. et sp. nov.)

Scoperto dinosauro carnivoro che respirava come uccelli odierni
martedì, 30 settembre 2008 8.50 136
CHICAGO (Reuters) – Alcuni scienziati hanno rinvenuto i resti di un dinosauro carnivoro di grossa taglia con un apparato respiratorio molto simile a quello di un uccello di oggi. La scoperta rafforza l’idea che ci sia un legame tra volatili e dinosauri e contribuisce a spiegare l’evoluzione del sistema respiratorio proprio solo degli uccelli.

Estratto da rocce datate 85 milioni di anni, lungo le rive del Rio Colorado nella provincia argentina di Mendoza, questo predatore lungo 10 metri e che camminava in posizione eretta pesava quanto un elefante e aveva probabilmente le piume, secondo quanto hanno riferito gli scienziati.

Ma il suo apparato respiratorio rende questo dinosauro unico, ha detto Paul Sereno dell’Università di Chicago, che ha scritto della scoperta sulla rivista Plos One.

Al posto dei polmoni che si espandono e restringono, ha detto Sereno, questo animale potrebbe aver avuto delle sacche d’aria che funzionavano come una sorta di soffietto, che spingevano l’aria nei polmoni rigidi, come accade negli uccelli.

Il team di studiosi ha nominato il dinosauro Aerosteon riocoloradensis (“ossa areate del Rio Colorado”), perché le sue ossa hanno una conformazione a spugna nota come “pneumatizzazione”.

Gran parte dei paleontologi pensa che gli uccelli si siano evoluti da piccoli dinosauri carnivori con le piume, e il primo uccello rinvenuto è molto simile a uno di questi animali estinti.

vedi commenti e approfondimenti dal post: link  (dai blog “Theropoda” e SVPOW)

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Evidence for Avian Intrathoracic Air Sacs in a New Predatory Dinosaur from Argentina

Paul C. Sereno1*, Ricardo N. Martinez2, Jeffrey A. Wilson3, David J. Varricchio4, Oscar A. Alcober2, Hans C. E. Larsson5

Abstract

Background

Living birds possess a unique heterogeneous pulmonary system composed of a rigid, dorsally-anchored lung and several compliant air sacs that operate as bellows, driving inspired air through the lung. Evidence from the fossil record for the origin and evolution of this system is extremely limited, because lungs do not fossilize and because the bellow-like air sacs in living birds only rarely penetrate (pneumatize) skeletal bone and thus leave a record of their presence.

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0003303

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additional links:

MSU paleontologist part of team that discovered new dinosaur (with photos)

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Bus-Sized Dinosaur Breathed Like Birds Do
FOXNews – 30 set 2008
By Jeanna Bryner This rendering of Aerosteon shows its lungs (red) and air sacs (other colors) as they might have been in life about 85 million years ago.
Dinosaur fossils may provide evolutionary link to modern birds
guardian.co.uk – 30 set 2008
Fossils of a 33-foot-long (10.1-metre-long), previously unknown meat-eating dinosaur discovered in South America are delivering insights to scientists on
New scary, cool dino was Tweety’s great-grandpa
Chicago Sun-Times – 30 set 2008
BY DAVE NEWBART Staff Reporter dnewbart@suntimes.com But Aerosteon — a new dinosaur discovery announced Monday by University of Chicago paleontologist Paul
Please Stop, Dad; I’m So Embarrassed
Washington Post – 29 set 2008
A new study shows that adolescents use a different part of their brain than adults to process emotions such as guilt or embarrassment.
Dinosaur related to Tyrannosaurus Rex had bird-like breathing system
Telegraph.co.uk – 29 set 2008
By Richard Alleyne, Science Correspondent The remains of a new dinosaur that was a distant relative of Tyrannosaurus Rex has been discovered and could
Forget bird-brained
Science News – 29 set 2008
By Laura Sanders Paleontologists have discovered a new species of carnivorous dinosaur that possessed an interesting feature: It breathed like a bird.
PHOTOS: Meat Eating Dino had Birdlike Breathing System
National Geographic – 29 set 2008
September 29, 2008–This newly found South American dinosaur may have had flesh-ripping teeth, but it had the lungs of a bird, scientists announced Monday.
Birdlike Dinosaur Found in Argentina
National Geographic – 29 set 2008
A new predatory dinosaur with a birdlike breathing system found in Argentina may help scientists better understand the evolution of birds’ lung systems.
Dinosaur predator breathed like a modern bird
Reuters – 29 set 2008
By Julie Steenhuysen CHICAGO (Reuters) – Scientists have unearthed the remains of a large meat-eating dinosaur with a breathing apparatus much like a modern
New Evidence To Suggest That Dinosaurs Breathed Like Birds
Medical News Today – 1 ott 2008
Birds have evolved an unusual breathing system, and clues to its development lie in the remains of a recently-discovered 10-meter-long predatory dinosaur
‘Air bone’ dinosaur is missing link with birds
InTheNews.co.uk – 29 set 2008
A carnivorous dinosaur with a bird-like breathing system has provided more evidence of the connection between the two groups of animals separated by
New meat-eating dinosaur from Argentina had bird-like breathing system
EurekAlert (press release) – 29 set 2008
MENDOZA, Argentina—The remains of a new 10-meter-long predatory dinosaur discovered along the banks of Argentina’s Rio Colorado is helping to unravel how
Dinosaur’s fowl breath seals tie to birds
ABC Science Online – 29 set 2008
The discovery of air sacs in a new 10-metre-long, meat-eating dinosaur may seal the connection between birds and dinosaurs and explain how birds’ unique
Carnivorous Dinosaur With Bird-Like Lungs Discovered
Discover Magazine – 30 set 2008
A 33-foot long, carnivorous dinosaur that lived 85 million years ago had a breathing system similar to that used by modern birds, and researchers say the
Meat-eating dinosaur from Argentina had bird-like breathing system
EurekAlert (press release) – 29 set 2008
ANN ARBOR, Mich.–The remains of a 30-foot-long predatory dinosaur discovered along the banks of Argentina’s Rio Colorado is helping to unravel how birds

In German:

Luftschlauch-Dino lässt Forscher rätseln
Spiegel Online – 30 set 2008
Forscher haben einen bizarren Dinosaurier mit einem System von Luftkanälen unter der Haut entdeckt. Das Tier besaß ein dichtes Federkleid und war so schwer
Dinosaurier mit “Klimaanlage” bestätigt wissenschaftliche Hypothesen
derStandard.at – 29 set 2008
Buenos Aires/Mendoza – Der Vogelflug ist eine komplexe evolutionäre Errungenschaft, die einer Reihe ganz unterschiedlicher Voraussetzungen bedarf: Von einem
Fundsache, Nr. 410 Raubsaurier mit “Klimaanlage”
n-tv – 29 set 2008
Forscher haben in Argentinien einen bizarren Raub-Saurier mit Hinweisen auf eine Art eingebaute “Klimaanlage” zur Senkung der Körpertemperatur gefunden.

settembre 30, 2008 Posted by | - R. Dinosauri, - Teropodi, 1 Cretaceo, America Southern, Articolo sc. di riferimento, FREE ACCESS, Lang. - Italiano, P - Ritrovamenti fossili, Paleontology / Paleontologia, Theropoda | , , , , , , , , , , | 1 commento

Il dinosauro argentino

 

Il dinosauro argentino

A Buenos Aires, un gruppo di scienziati ha annunciato il ritrovamento dei resti fossili di un dinosauro sconosciuto, vissuto circa 70 milioni di anni fa.  Si trattava di un carnivoro lungo tra i 6 e i 7 metri. La scoperta è avvenuta nella provincia di Santa Cruz, in Patagonia (copyright: Reuters).

[5 giugno 2008]

VIDEO – (da “Le Scienze” by reuters)

giugno 17, 2008 Posted by | - R. Dinosauri, 1 Cretaceo, America Southern, P - Ritrovamenti fossili, Paleontology / Paleontologia, Video | , , , , | Lascia un commento

Stati Uniti restituiscono resti fossili all’Argentina

 

Articolo tratto da: Associated press

US to return Argentine dinosaur eggs

BUENOS AIRES, Argentina (AP) — A senior U.S. Homeland Security official is in Argentina to discuss money laundering, human trafficking — and dinosaur eggs.

Julie L. Myers, assistant secretary for Immigration and Customs Enforcement, said Monday that she plans to hand over to Argentina’s government a cache of more than 8,100 pounds (3,675 kilograms) of fossils seized two years ago by ICE agents at a gem and mineral show in Tucson, Arizona.

The fossils — including an unspecified number of dinosaur eggs, shell fragments, petrified pine cones and fossilized prehistoric crabs — had been illegally removed from Argentina and offered for sale in the United States, according to an ICE statement.

“We think these historical artifacts rightly belong to the people of Argentina, so I’m very proud to be able to formally hand them back,” Myers said. She called the fossils “pieces of a country’s history that people are trying to put up for sale.”

Experts believe the fossils date from an era between 180 million and 250 million years ago, the agency noted.

Details of a midweek, handover ceremony were still being worked out, with plans to fly the fossils to Argentina shortly, Myers’ office said.

Myers then plans to visit Uruguay and Brazil, to discuss money laundering and efforts to crack down on networks that traffic women and children for prostitution rings and forced labor.

A special immigration unit created to track alleged human rights violators from foreign nations is continuing to aggressively pursue individuals who seek refuge in the U.S., Myers said.

U.S. immigration officials last October escorted a former Argentine army officer, Ernesto Guillermo Barreiro, on a flight from the U.S. to his homeland, where he was wanted for alleged abuses during the country’s 1976-83 military dictatorship.

“Our goal is to make sure the United States is not a safe haven for human rights violators,” Myers said.

maggio 31, 2008 Posted by | America Northern, America Southern, Commercio illegale | , , , | Lascia un commento