Paleonews

Il blog dedicato ai Paleontologi !!!!

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 »

  1. …. “alla faccia” di chi sta ancora cercando prove dell’evoluzione …..
    vedi: link

    Commento di dinostampnews | settembre 30, 2008


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