Paleonews

Il blog dedicato ai Paleontologi !!!!

2009-07-13 – New Theropod: Kemkemia auditorei (Cau & Maganuco, 2009)

Congratuazioni agli autori !!!

Ecco i post sul blog Theropda (A.Cau):

Annunci

luglio 13, 2009 Posted by | - R. Dinosauri, - Teropodi, 1 Cretaceo, Africa, An. Vertebrates, Articolo sc. di riferimento, Blogs, Lang. - Italiano, P - Ritrovamenti fossili, Paleontology / Paleontologia, Theropoda | , , , , , | Lascia un commento

2009-06-12 – Italia: il 4 dinosauro !!! (fourth Italian dinosaur)

Con un po` di ritardo ecco il post su una notizia “eccezonale”.

Un osso ritrovato in sedimenti di origine marina nel Cenomaniano della Sicilia e stato identificato come appartenente a un dinosauro (il quarto ritovato in Italia).

Per info piu` dettagliate: Blog – Teropoda

Riferimento bibliografico:

Garilli, V, et al. “First dinosaur bone from Sicily identified by histology and its palaeobiogeographical implications.” Neues Jahrbuch für Geologie und Paläontologie 252.2 (2009):207-216.

giugno 12, 2009 Posted by | - Italia, - R. Dinosauri, An. Vertebrates, Articolo sc. di riferimento, Bl - Top posts, Blogs, Europa, Lang. - Italiano, P - Ritrovamenti fossili, Paleontology / Paleontologia, Theropoda | , , , , , | Lascia un commento

2009-03-19 – Tianyulong confuciusi: un nuovo dinosauro con le piume (feathered Ornithopd Dinosaur)

Un nuovo dinosauro con le piume

Scoperto in Cina un fossile risalente a più di 100 milioni di anni fa

 Il ritrovamento in Cina di un nuovo fossile di dinosauro dotato di piumaggio riapre il dibattito sulla diffusione di questi rettili preistorici. Questa volta gli scienziati hanno portato alla luce un piccolo esemplare che viveva nelle regioni nord-orientali del continente asiatico più di cento milioni di anni fa. L’animale aveva il corpo coperto da lunghi filamenti simili a piume, era piccolo, agile e scattante. Camminava su due zampe, aveva una lunga coda e si cibava probabilmente di piante, insetti e piccoli vertebrati.

PENNUTI PREISTORICI – È stato chiamato Tianyulong confuciusi, dalla somma del nome del museo dove è conservato e di quello del filosofo Confucio. Diversamente dai dinosauri «piumati» ritrovati fino ad oggi e appartenenti al sottordine dei teropodi (di cui fa parte anche il T-rex), questo pennuto preistorico è un eterodontosauride vissuto nel Cretaceo inferiore, circa 144 milioni di anni fa. Secondo gli scienziati le sue piume sono diverse sia da quelle degli uccelli che da quelle dei cugini teropodi: si tratta infatti di strutture meno flessibili e più compatte, e comunque non adatte al volo. Ma nonostante le differenze, sicuramente tutte le tipologie di proto-piume conosciute sono correlate tra loro.

  L’ETÀ DELLE PIUME – Secondo alcuni paleontologi quindi le piume primitive sono una caratteristica ereditata dai due gruppi di dinosauri da un antenato comune e risalgono presumibilmente a 200 milioni di anni fa. Grazie alle particolari condizioni geologiche della provincia cinese del Liaoning, è sempre più frequente il ritrovamento di fossili di dinosauri provvisti di piume, e ciò fa pensare che fossero molto più diffusi di quanto si pensasse fino a pochi anni fa. Resta comunque ancora oscura la funzione (probabilmente ornamentale) di queste appendici che, come le piume degli uccelli attuali, erano molto colorate ma sicuramente alle origini non erano nate per volare

Valentina Tubino
19 marzo 2009

fonte: corriere.it

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Reconstruction of Tianyulong confuciusi, a feathered heterodontosaurid ornithischian dinosaur (Illustration: Li-Da Xing)
Reconstruction of Tianyulong confuciusi, a feathered heterodontosaurid ornithischian dinosaur (Illustration: Li-Da Xing)

Approfondimento sui Blog

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 An Early Cretaceous heterodontosaurid dinosaur with filamentous integumentary structures

Xiao-Ting Zheng, Hai-Lu You, Xing Xu & Zhi-Ming Dong

Nature 458, 333-336 (19 March 2009) | doi:10.1038/nature07856

Ornithischia is one of the two major groups of dinosaurs, with heterodontosauridae as one of its major clades. Heterodontosauridae is characterized by small, gracile bodies and a problematic phylogenetic position1, 2. Recent phylogenetic work indicates that it represents the most basal group of all well-known ornithischians3. Previous heterodontosaurid records are mainly from the Early Jurassic period (205–190 million years ago) of Africa1, 3. Here we report a new heterodontosaurid, Tianyulong confuciusi gen. et sp. nov., from the Early Cretaceous period (144–99 million years ago) of western Liaoning Province, China. Tianyulong extends the geographical distribution of heterodontosaurids to Asia and confirms the clade’s previously questionable temporal range extension into the Early Cretaceous period. More surprisingly, Tianyulong bears long, singular and unbranched filamentous integumentary (outer skin) structures. This represents the first confirmed report, to our knowledge, of filamentous integumentary structures in an ornithischian dinosaur.

Correspondence to: Hai-Lu You: Email: youhailu@gmail.com).

·         abstract and links

·         Figures and tables

·         Supplementary info

marzo 19, 2009 Posted by | - Ornitopodi, - R. Dinosauri, 1 Cretaceo, America Northern, An. Vertebrates, Articolo sc. di riferimento, Bl - Top posts, Blogs, Lang. - Italiano, Mesozoic, P - Evoluzione, P - morfologia funzionale, P - Paleoetologia, P - Preservazione eccezionale, Paleontology / Paleontologia, SVPOW, Theropoda, X - Nature | , , , | Lascia un commento

2009-03-18 – Hesperonychus Elizabethae: un nuovo mini-dinosauro carnivoro (mini meat-eating dinosaur)

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Scoperto fossile di dinosauro nano 

Viveva nell’America del nord 75 milioni di anni fa

(ANSA)- ROMA, 17 MAR – Dei mini-dinosauri carnivori vivevano nell’America del nord, 75 milioni di anni fa. Lo conferma un fossile scoperto da paleontologi canadesi. Il fossile, scoperto da Nick Longrich e Philip Currie delle universita’ di Calgary e Alberta, viveva nell’odierno Canada. Era piu’ piccolo di un gatto e correva su due zampe fornite di artigli. Probabilmente cacciava insetti e piccoli mammiferi. Resti fossili di questo dinosauro furono gia’ trovati circa 25 anni fa.

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Alberta researchers discover mini meat-eating

dinosaur

It had razor sharp claws and its teeth may have been the terror of Alberta 75 million years ago — among animals smaller than a squirrel, that is.
University of Calgary researcher Nicholas Longrich sits with a model of tiny dinosaur, which likely weighed less than two kilograms. (University of Calgary)

University of Calgary researcher Nicholas Longrich sits with a model of tiny dinosaur, which likely weighed less than two kilograms. (University of Calgary)

The kitten-sized predator identified by paleontologists at the University of Calgary and the University of Alberta is the smallest carnivorous dinosaur ever found in North America. The next smallest meat-eating dinosaur ever found on the continent was about the size of a wolf.

“Until we found this animal, basically we had no evidence for any small carnivores being present in North America,” said University of Calgary researcher Nicholas Longrich, in a video released by the university on Monday.

Longrich and the University of Alberta’s Philip Currie have written an article describing the velociraptor-like dinosaur, published Monday in the Proceedings of the National Academy of Science.

The tiny, bird-like predator ran on two legs and was about half the size of a housecat, weighing less than two kilograms, and standing about as tall as an average wastebasket. It likely hunted near the ground in marshes and forests for insects, small mammals, amphibians and “maybe even baby dinosaurs,” Longrich said.

The researchers have given the dinosaur the scientific name Hesperonychus Elizabethae.

Hesperonychus means “western claw” and Elizabethae is a tribute to the late Elizabeth (Betsy) Nicholls, the well-known Alberta paleontologist and former curator at the Royal Tyrrell Museum in Drumheller who originally unearthed the bones.

Found 20 km from Dinosaur Provincial Park

Nicholls found the fossilized claws and a well-preserved pelvis in 1982 at the Dinosaur Park Formation, about 20 kilometres east of Dinosaur Provincial Park, or about 140 kilometres east of Calgary. Longrich said he was going through the collections at the University of Alberta when he stumbled across the bones less than two years ago.

Previously, paleontologists believed they belonged to a juvenile dinosaur of some sort.

Longrich noticed that one of the bones looked like the hip bones of some velociraptor-like dinosaurs excavated in China. Those Chinese dinosaurs were a little less than a metre long.

On closer examination, Longrich noticed that the pelvic bones had fused together — something that happens after the animal stops growing, indicating that it was an adult.

Because quite a number of bones were found, the researchers suggest that Hesperonychus was an important part of the ecosystem in the late Cretaceous period, as small predators such as cats and foxes are an important part of the ecosystem today.

The results also show for the first time that tiny velociraptor-like dinosaurs lived not just in China, but also in North America, and that such dinosaurs continued to roam the Earth about 45 million years longer than previous records suggested.

2009-03-16-hesperonychus-elizabethae-02

source: cbc.ca

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Researchers ID North America’s smallest dinosaur

Reuters – ‎13 ore fa‎
By Scott Haggett CALGARY, Alberta (Reuters) – Canadian researchers said on Monday they have discovered North America’s smallest known dinosaur, a pint-sized
Telegraph.co.uk

 

AFP

Miniature carnivore dinosaurs roamed North America

AFP – ‎18 minuti fa‎
WASHINGTON (AFP) – Meat-eating dinosaurs the size of a small chicken roamed areas of North America 75 million years ago, according to research by Canadian

marzo 18, 2009 Posted by | - R. Dinosauri, - Teropodi, 1 Cretaceo, America Northern, An. Vertebrates, Bl - Top posts, Blogs, Lang. - Italiano, Mesozoic, P - Ritrovamenti fossili, Paleontology / Paleontologia, Theropoda | , , , , , , , | 3 commenti

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

2008-12 – Austroraptor

Approfondimenti sui blog:

THEROPODA – Austroraptor: un dromeosauro “spinosauro-mimo” (Novas et al., 2008)

 Giant, meat-eating raptor dinosaur discovered in Argentina

BUENOS AIRES (AFP) — The fossils of a newly discovered, meat-eating raptor dinosaur, one of the biggest and perhaps most recent to live in Argentina’s Patagonia region 70 million years ago, were presented Wednesday at a Buenos Aires museum.

The fossils of the dinosaur named “Austroraptor cabazai” were found at Bajo de Santa Rosa, in Rio Negro province, which has already yielded several species of herbivore dinosaurs, during paleontological digs funded by the US National Geographic Society.

Measuring five meters (16 feet) in length with a long, flat cranium, short forearms and jaws full of sharp teeth, Austroraptor was among the largest of the raptors, and belonged to the dromaeosaurids or birdlike dinosaurs that walked on two legs, the most famous of which was the Velociraptor mongoliensis.

The Austroraptor was found in rock formations dating to 70 million years ago, making it one of the last dinosaurs to walk in Patagonia before they became extinct at the end of the Cretaceous period 145 to 65 million years ago.

A plastic reproduction of the Austroraptor cabazai skeleton will be included in an exhibit of Argentine dinosaurs to open next year in Europe.

The National Geographic expedition that discovered the fossils was led by paleontologist Fernando Novas, who made the presentation Wednesday at Argentina’s Bernardino Rivadavia Museum of Natural History, in Buenos Aires.

source: http://www.google.com/hostednews/afp/article/ALeqM5icabH0haPkFNzWARCloCdaBbBWbw

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Canada.com

Raptor dinosaur bones found in Argentina
Sydney Morning Herald – 17 dic 2008
“The new dinosaur is the largest dromaeosaurid (raptor) yet discovered in the Southern Hemisphere and depicts bizarre cranial and postcranial features,” the paper said.
Giant, meat-eating raptor dinosaur discovered in Argentina AFP
“Bizarre” New Dinosaur: Giant Raptor Found in Argentina National Geographic
Earthtimes (press release) – Daily Mail – ScienceBlogs – Reuters
e altri 59 articoli simili »

dicembre 31, 2008 Posted by | - R. Dinosauri, - Teropodi, 1, 1 Cretaceo, America Southern, Blogs, Italiano (riassunto), Mesozoic, P - Ritrovamenti fossili, Paleontology / Paleontologia, Theropoda | , , , | 1 commento

2008-10-13 – Aerosteon Update 2 (Aerosteon riocoloradensis)

Un nuovo aggiornamento sui commenti dai Blog alla descrizione dell’Aerosteon riocoloradensis (e temi associati ….. ) e i multimedia da “La Repubblica” (fotogallery e video

Blog ITA – Theropoda + UltRazionale 

(complimenti ad Andrea Cau per gli splendidi post)

  • Perché i dati attuali inducono a ribattezzare il “sistema polmonare aviario” come “sistema polmonare saurischio” Ottobre 13, 2008
  • Il Gigantismo, espressione mesozoica del bauplan dinosauriano. Il caso dei teropodi. Ottobre 10, 2008
  • Il Giorno in cui Megamatrice superò la Massa Critica, raggiunse l’autocoscienza e si autoproclamò “Gregory Paul” Ottobre 10, 2008
  • Immagine in aggiunta al precedente post Ottobre 10, 2008
  • Errori di battitura o lapsus? Ottobre 9, 2008 [Da non perdere !!!!!]
  • Dà ad Aerosteon quel che è di Aerosteon, e a Majungasaurus quel che è di Majungasaurus Ottobre 9, 2008
  • Cos’è diagnostico per identificare un uccello? Dipende se lo dici oggi o se lo dici nel 1988… Ottobre 8, 2008
  • Perché il braccio di Tyrannosaurus non è atrofico come quello di Carnotaurus? Ottobre 6, 2008
  • Super Theropod Week, Part 3: Aerosteon e la ventilazione in Theropoda Ottobre 3, 2008
  • BLOG ENG – Tetrapod zoology

  • Unhappy with Aerosteon Ottobre 6, 2008
  •  Blog ENG – SVPOW

  • The Aerosteon saga, Part 2: Overinflation and undercitation Ottobre 5, 2008
  • The Aerosteon saga, Part 1: Introduction and background Ottobre 4, 2008
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    Original Article:

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

    Paul C. Sereno, Ricardo N. Martinez, Jeffrey A. Wilson, David J. Varricchio, Oscar A. Alcober, Hans C. E. Larsson

    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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  •  Non chiamatelo “sistema polmonare aviario”, ma “sistema polmonare saurischio” Ottobre 13, 2008
  • Il Gigantismo, espressione mesozoica del bauplan dinosauriano. Il caso dei teropodi. Ottobre 13, 2008
  • ottobre 13, 2008 Posted by | - R. Dinosauri, - Teropodi, 1 Cretaceo, America Northern, Articolo sc. di riferimento, FREE ACCESS, Lang. - Italiano, P - Ritrovamenti fossili, Paleontology / Paleontologia, Theropoda | , , , , , , , , , , | Lascia un commento

    Epidexipteryx hui : le piume per “esibizionismo” e non per volare

    vedi pure aggiornamento: 2008-10-23 – Epidexipteryx hui: le piume per “esibizionismo” e non per volare (2)

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    First Dinosaur Feathers for Show, Not Flight?

    Charles Q. Choi
    for National Geographic News
    September 29, 2008

    The oldest known dinosaur relative of birds had “bizarre” anatomy, including long, ribbon-like tail feathers that suggest plumage may have first evolved for show rather than for flight, scientists say.

    Farmers unearthed a fossil of the new dino species, dubbed Epidexipteryx hui, from the hills of Inner Mongolia in late 2007.
    The remains date back 152 million to 168 million years ago, making the newfound creature slightly older than Archaeopteryx, the most primitive known bird.

    (Related: “Earliest Bird Had Feet Like Dinosaur, Fossil Shows” [December 1, 2005].)

    Like other avialans—birds and their closest dinosaur relatives—Epidexipteryx is a theropod, a group of two-legged animals that includes Tyrannosaurus rex.

    A fossil of Epidexipteryx hui found in Mongolia shows long, ribbon-like tail feathers in addition to a body covered with shorter plumage.

    A fossil of Epidexipteryx hui found in Mongolia shows long, ribbon-like tail feathers in addition to a body covered with shorter plumage.

    Researchers think the pigeon-size Epidexipteryx might have used its plumes as flashy ornaments, since it was mostly covered in short feathers that lack the structure necessary for flight.

    “For example, [the feathers] could potentially have played a role in displays intended to attract a mate, scare off a rival, or send a warning signal to other individuals of the same species,” said study co-author Fucheng Zhang, a paleontologist at the Chinese Academy of Sciences in Beijing.

    “This is very exciting indeed, since it gives us a window into a stage of avialan history just preceding the appearance of the classic ‘first bird,'” Zhang said.

    “It shows that the use of feathers for visual communication—as opposed to other functions such as insulation and flight—was a very early development.”

    “Bizarre” Anatomy

    Epidexipteryx lived in the mid- to late Jurassic period in a lush, well-vegetated area that was rich in salamanders and other possible prey.

    The dinosaur had claws similar to those of ground-foraging birds, such as ostriches and turkeys, and its front teeth were large and protruding.

     

    “One can certainly imagine [the teeth] being used to snatch at small prey, such as lizards, small mammals, or even insects,” Zhang said.

    Strangely, Epidexipteryx’s anatomy seems to be a hodgepodge of features taken from a variety of animals.

    For instance, its front limb bones and short, bony tail resemble those of living birds. But its short, high skull and large front teeth look like those of small theropods called oviraptors.

    “It’s not uncommon for features present in one group to appear independently in another,” Zhang said of the newfound dino’s “bizarre” anatomy.

    “It’s also typical for different parts of the body to evolve at different rates, so that some bits end up looking very specialized whereas others remain primitive.”

    (See pictures of other “bizarre” dinosaurs.)

    Zhang and his colleagues reported their findings last week in Nature Precedings, an online pre-publication service run by the journal Nature.

    Evolution Experiments?

    Luis Chiappe is a paleontologist with the Natural History Museum of Los Angeles County and a former National Geographic Society grantee. (National Geographic News is part of the National Geographic Society.)

    He said that the mosaic of features suggests “there was a lot of evolutionary experimentation around the origin of birds, with many different kinds of lineages reaching different levels of ‘birdness.'”

    But Chiappe, who was not involved in the new study, is skeptical of the idea that feathers originated as ornaments.

    “Feathers could have served an aerodynamic function of some sort whether you fly or not. You could flap feathered wings and run faster,” he said.

    “Still, these ornamental feathers are a really interesting new piece of evidence into why feathers first originated.”

    SOURCES AND RELATED WEB SITES

    http://news.nationalgeographic.com/news/2008/09/080929-bizarre-dinosaur.html
     

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      vedi approfondimento sul blog “Theropoda

    settembre 30, 2008 Posted by | - R. Dinosauri, - Teropodi, 2 Jurassic / Giurassico, Articolo sc. di riferimento, Asia, Bl - Top posts, FREE ACCESS, Lang. - Italiano, P - Paleoetologia, P - Preservazione eccezionale, Paleontology / Paleontologia, Theropoda | , , , , , , , , , , , | 2 commenti

    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