Re: [2010] Brèves paléontologiquesPosté par Captbot
Je ne crois pas l'avoir vu passer celle là.
Dans les Naturwissenschaften d'Avril:
First complete sauropod dinosaur skull from the Cretaceous of the Americas and the evolution of sauropod dentition
Daniel Chure, Brooks B. Britt, John A. Whitlock, & Jeffrey A. Wilson
Je crois qu'il est en libre accès sur le site
Dans les Naturwissenschaften d'Avril:
First complete sauropod dinosaur skull from the Cretaceous of the Americas and the evolution of sauropod dentition
Daniel Chure, Brooks B. Britt, John A. Whitlock, & Jeffrey A. Wilson
Je crois qu'il est en libre accès sur le site
Posté par Olivier72
3 ... nouveaux papiers :
Sertich, J. J. W., and M. A. Loewen. 2010. A New Basal Sauropodomorph Dinosaur from the Lower Jurassic Navajo Sandstone of Southern Utah. PLoS ONE 5(3): e9789.
Knoll, F. 2010. A primitive sauropodomorph from the upper Elliot Formation of Lesotho. Geological Magazine early online
Bandyopadhyay, S., Gillette, D. D., Ray, S., and D. P. Sengupta. 2010. Osteology of Barapasaurus tagorei (Dinosauria: Sauropoda) from the Early Jurassic of India.
Palaeontology early online
2 ... nouvelles espèces de sauropodomorphes :
Seitaad ruessi gen. et sp. nov.
Ignavusaurus rachelis gen. et sp. nov.
et 1 ... en accès gratuit :
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0009789
Sertich, J. J. W., and M. A. Loewen. 2010. A New Basal Sauropodomorph Dinosaur from the Lower Jurassic Navajo Sandstone of Southern Utah. PLoS ONE 5(3): e9789.
Knoll, F. 2010. A primitive sauropodomorph from the upper Elliot Formation of Lesotho. Geological Magazine early online
Bandyopadhyay, S., Gillette, D. D., Ray, S., and D. P. Sengupta. 2010. Osteology of Barapasaurus tagorei (Dinosauria: Sauropoda) from the Early Jurassic of India.
Palaeontology early online
2 ... nouvelles espèces de sauropodomorphes :
Seitaad ruessi gen. et sp. nov.
Ignavusaurus rachelis gen. et sp. nov.
et 1 ... en accès gratuit :
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0009789
Posté par Webmaster
Quelques informations sur ces 2 nouvelles espèces:
- Seitaad ruessi:
Prosauropode, annoncé comme un possible ancêtre du Diplodocus partout dans les médias.
Articles: Le Figaro, Présentation, photos et interview de l'un des auteurs (en anglais)
- Ignavusaurus rachelis:
Sauropodomorphe basal du Lésotho
Illustration
- Seitaad ruessi:
Prosauropode, annoncé comme un possible ancêtre du Diplodocus partout dans les médias.
Articles: Le Figaro, Présentation, photos et interview de l'un des auteurs (en anglais)
- Ignavusaurus rachelis:
Sauropodomorphe basal du Lésotho
Illustration
Posté par Tikémi
Nature advance online publication 24 March 2010 | doi:10.1038/nature08976; Published online 24 March2010
The complete mitochondrial DNA genome of an unknown hominin from southernSiberia
Johannes Krause, Qiaomei Fu, Jeffrey M. Good, Bence Viola, Michael V.Shunkov, Anatoli P. Derevianko & Svante Pääbo
With the exception of Neanderthals, from which DNA sequences of numerous individuals have now been determined, the number and genetic relationships of other hominin lineages are largely unknown. Here we report a complete mitochondrial (mt) DNA sequence retrieved from a bone excavated in 2008 in Denisova Cave in the Altai Mountains in southern Siberia. It represents a hitherto unknown type of hominin mtDNA that shares a common ancestor with anatomically modern human and Neanderthal mtDNAs about 1.0 million years ago. This indicates that it derives from a hominin migration out of Africa distinct from that of the ancestors of Neanderthals and of modern humans. The stratigraphy of the cave where the bone was found suggests that the Denisova hominin lived close in time and space with Neanderthals as well as with modern humans.
The complete mitochondrial DNA genome of an unknown hominin from southernSiberia
Johannes Krause, Qiaomei Fu, Jeffrey M. Good, Bence Viola, Michael V.Shunkov, Anatoli P. Derevianko & Svante Pääbo
With the exception of Neanderthals, from which DNA sequences of numerous individuals have now been determined, the number and genetic relationships of other hominin lineages are largely unknown. Here we report a complete mitochondrial (mt) DNA sequence retrieved from a bone excavated in 2008 in Denisova Cave in the Altai Mountains in southern Siberia. It represents a hitherto unknown type of hominin mtDNA that shares a common ancestor with anatomically modern human and Neanderthal mtDNAs about 1.0 million years ago. This indicates that it derives from a hominin migration out of Africa distinct from that of the ancestors of Neanderthals and of modern humans. The stratigraphy of the cave where the bone was found suggests that the Denisova hominin lived close in time and space with Neanderthals as well as with modern humans.
Posté par Captbot
Très intéressant, je déplore juste qu'il n'y ai qu'un spécimen dont on ai prélevé l'ADN.
Posté par Tikémi
Et zou, voilà qu'on trouve le grand-père de Tafiolosaurus dans l'hémisphère sud maintenant : http://www.sciencedaily.com/releases/2010/03/100325143045.htm
Sinon des trucs pas mal dans le prochain Palaeogeography, Palaeoclimatology, Palaeoecology, notamment des articles sur Hateg :
*Uppermost Cretaceous megaloolithid eggs from the Hateg Basin, Romania, associated with hadrosaur hatchlings: Search for explanation
Dan Grigorescu, Géraldine Garcia, Zoltán Csiki, Vlad Codrea, Ana-Voica Bojar
*Palaeobiogeographic relationships of the Hateg biota - between isolation and innovation
David B. Weishampel, Zoltán Csiki, Michael J. Benton, Dan Grigorescu, Vlad Codrea
*New evidence for a trophic relationship between the dinosaurs Velociraptor and Protoceratops
David Hone, Jonah Choiniere, Corwin Sullivan, Xing Xu, Michael Pittman, Qingwei Tan
Sinon des trucs pas mal dans le prochain Palaeogeography, Palaeoclimatology, Palaeoecology, notamment des articles sur Hateg :
*Uppermost Cretaceous megaloolithid eggs from the Hateg Basin, Romania, associated with hadrosaur hatchlings: Search for explanation
Dan Grigorescu, Géraldine Garcia, Zoltán Csiki, Vlad Codrea, Ana-Voica Bojar
*Palaeobiogeographic relationships of the Hateg biota - between isolation and innovation
David B. Weishampel, Zoltán Csiki, Michael J. Benton, Dan Grigorescu, Vlad Codrea
*New evidence for a trophic relationship between the dinosaurs Velociraptor and Protoceratops
David Hone, Jonah Choiniere, Corwin Sullivan, Xing Xu, Michael Pittman, Qingwei Tan
Posté par Lolo
A noter aussi une ostéologie de Magnosaurus dans je sais plus où, de Bothriospondylus et Barapasaurus dans Palaeontology: le bestiau est super complet 
Posté par Pyroraptor
Je voudrais bien celui de la tafiole 
svp
Et Lolo si tu avais les liens pour les 3 osteo se serait cool!
svpEt Lolo si tu avais les liens pour les 3 osteo se serait cool!
Posté par Spinosdu93
Voilà un [url=Ancient Fossil Flea-Like Creature: Rare Body Parts Find Provides Vital Clues to Identity] petit article sur une puce d'eau du Silurien avec les traces des parties molles genres yeux, 420 millions d'années.
J'espère que ça ne vous dérange pas parce que ce n'est pas du dino.
J'espère que ça ne vous dérange pas parce que ce n'est pas du dino.
Posté par Naldo
Tu rigoles
?Sinon, ben, c'est pas non plus la fin du monde, c'est un Ostracode. Très bien conservé certes, c'est impressionnant.
Mais bon des Ostracodes on en trouve partout. Tellement qu'on s'en sert comme fossiles stratigraphiques !
Posté par Captbot
Un petit coup de pub pour mon labo et ma collègue de bureau 
Vanesa L. De Pietri, Jean-Pierre Berger, Claudius Pirkenseer, Laureline Scherler, and Gerald Mayr 2010 New skeleton from the early Oligocene of Germany indicates a stem-group position of diomedeoidid birds. Acta Palaeontologica Polonica 55 (1), 23-34
http://www.bioone.org/doi/full/10.4202/app.2009.0069
Vanesa L. De Pietri, Jean-Pierre Berger, Claudius Pirkenseer, Laureline Scherler, and Gerald Mayr 2010 New skeleton from the early Oligocene of Germany indicates a stem-group position of diomedeoidid birds. Acta Palaeontologica Polonica 55 (1), 23-34
http://www.bioone.org/doi/full/10.4202/app.2009.0069
Posté par Tikémi
Une tripotée d'articles parus récemment :
*Hou L.-H., Li P.-P., Ksepka D.T., Gao K.-Q. & Norell M.A. In press. Implications of flexible-shelled eggs in a Cretaceous choristoderan reptile. Proceedings of the Royal Society B 277(1685):1235-1239.
Flexible, or soft-shelled, eggs are almost unknown in the fossil record, leaving large gaps in our knowledge of the reproductive biology of many tetrapod clades. Here, we report two flexible-shelled eggs of the hyphalosaurid choristodere Hyphalosaurus baitaigouensis from the Early Cretaceous of China, one containing an embryo and the second associated with a neonate. Choristoderes are an enigmatic group of aquatic reptiles that survived the K–T extinction but died out in the Miocene. Hyphalosaurids, a specialized clade of Choristodera, resemble miniature plesiosaurs and are considered to be primarily aquatic in habit. Scanning electron microscopy of samples from the eggs reveals a thin, non-columnar external mineralized layer characterized by rounded nodes and tentatively identified poorly structured irregular pores, with an underlying amorphous layer presumably representing decomposed protein fibrils. While the relationships of Choristodera remain controversial, eggshell microstructure more closely resembles that of Lepidosauromorpha (the lineage including lizards) as opposed to that of Archosauromorpha (the lineage including birds and crocodiles). http://rspb.royalsocietypublishing.org/content/277/1685/1235.full
*Ji Q., Wu X.-C. & Cheng Y.-N. 2010. Cretaceous choristoderan reptiles gave birth to live young. Naturwissenschaften 97(4): 423-428.
Viviparity (giving birth to live young) in fossil reptiles has been known only in a few marine groups: ichthyosaurs, pachypleurosaurs, and mosasaurs. Here, we report a pregnant specimen of the Early Cretaceous Hyphalosaurus baitaigouensis, a species of Choristodera, a diapsid group known from unequivocal fossil remains from the Middle Jurassic to the early Miocene (about 165 to 20 million years ago). This specimen provides the first evidence of viviparity in choristoderan reptiles and is also the sole record of viviparity in fossil reptiles which lived in freshwater ecosystems. This exquisitely preserved specimen contains up to 18 embryos arranged in pairs. Size comparison with small free-living individuals and the straight posture of the posterior-most pair suggest that those embryos were at term and had probably reached parturition. The posterior-most embryo on the left side has the head positioned toward the rear, contrary to normal position, suggesting a complication that may have contributed to the mother's death. Viviparity would certainly have freed species of Hyphalosaurus from the need to return to land to deposit eggs; taking this advantage, they would have avoided intense competition with contemporaneous terrestrial carnivores such as dinosaurs.
*Suteethorn, S., Le Loeuff, J., Buffetaut, E., and Suteethorn, V. 2010. Description of topotypes of Phuwiangosaurus sirindhornae, a sauropod from the Sao Khua Formation (Early Cretaceous) of Thailand, and their phylogenetic implications. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 256(1):109-121.
The holotype of Phuwiangosaurus sirindhornae Martin, Buffetaut and Suteethorn 1994, a 10 % complete sauropod skeleton, was excavated in the early 1980s by a Thai-French expedition. In 1993, the site was reopened and yielded two additional vertebrae: one posterior dorsal and one proximal caudal vertebra. On the basis of the size and shape of the vertebrae and the absence of identical bones from the type locality, we conclude that these vertebrae belong to the same individual as the holotype of P. sirindhornae and consider them as topotypes. A phylogenetic analysis, which for the first time includes recently described cranial and postcranial material, indicates that Phuwiangosaurus is a basal member of Titanosauriformes.
*Carballidoa J.L. & Pol D. In press. The dentition of Amygdalodon patagonicus (Dinosauria: Sauropoda) and the dental evolution in basal sauropods. Comptes Rendus Palevol.
Amygdalodon patagonicus is the oldest record of Sauropoda from South America and is known from several teeth and fragmentary postcranial remains. Here we describe in detail its dental morphology, characterized by the presence of broad spatulated teeth (with low SI values) and the absence of denticles in their crowns. The enamel bears a particular wrinkling pattern composed only of apicobasally-aligned pits, which are frequently joined to each other by a continuous sulcus. Some worn teeth have large wear-facets that extend over only one of the crown's edges. This unique combination of characters provides a proper diagnosis for Amygdalodon. Despite the fragmentary available material, Amygdalodon is here interpreted as a non-eusauropod sauropod based on the results of a phylogenetic analysis. The presence of derived dental characters in Amygdalodon, such as the presence of tooth-tooth occlusion, shows several features previously thought to diagnose Eusauropoda or Gravisauria appeared earlier during the early evolution of sauropods.
*Xu, X., Zheng, X., and You, H. 2010. Exceptional dinosaur fossils show ontogenetic development of early feathers. Nature 464:1338-1341.
Recent discoveries of feathered dinosaur specimens have greatly improved our understanding of the origin and early evolution of feathers, but little information is available on the ontogenetic development of early feathers. Here we describe an early-juvenile specimen and a late-juvenile specimen, both referable to the oviraptorosaur Similicaudipteryx, recovered from the Lower Cretaceous Yixian Formation of western Liaoning, China. The two specimens have strikingly different remiges and rectrices, suggesting that a radical morphological change occurred during feather development, as is the case for modern feathers. However, both the remiges and the rectrices are proximally ribbon-like in the younger specimen but fully pennaceous in the older specimen, a pattern not known in any modern bird. In combination with the wide distribution of proximally ribbon-like pennaceous feathers and elongate broad filamentous feathers among extinct theropods, this find suggests that early feathers were developmentally more diverse than modern ones and that some developmental features, and the resultant morphotypes, have been lost in feather evolution.
*Hou L.-H., Li P.-P., Ksepka D.T., Gao K.-Q. & Norell M.A. In press. Implications of flexible-shelled eggs in a Cretaceous choristoderan reptile. Proceedings of the Royal Society B 277(1685):1235-1239.
Flexible, or soft-shelled, eggs are almost unknown in the fossil record, leaving large gaps in our knowledge of the reproductive biology of many tetrapod clades. Here, we report two flexible-shelled eggs of the hyphalosaurid choristodere Hyphalosaurus baitaigouensis from the Early Cretaceous of China, one containing an embryo and the second associated with a neonate. Choristoderes are an enigmatic group of aquatic reptiles that survived the K–T extinction but died out in the Miocene. Hyphalosaurids, a specialized clade of Choristodera, resemble miniature plesiosaurs and are considered to be primarily aquatic in habit. Scanning electron microscopy of samples from the eggs reveals a thin, non-columnar external mineralized layer characterized by rounded nodes and tentatively identified poorly structured irregular pores, with an underlying amorphous layer presumably representing decomposed protein fibrils. While the relationships of Choristodera remain controversial, eggshell microstructure more closely resembles that of Lepidosauromorpha (the lineage including lizards) as opposed to that of Archosauromorpha (the lineage including birds and crocodiles). http://rspb.royalsocietypublishing.org/content/277/1685/1235.full
*Ji Q., Wu X.-C. & Cheng Y.-N. 2010. Cretaceous choristoderan reptiles gave birth to live young. Naturwissenschaften 97(4): 423-428.
Viviparity (giving birth to live young) in fossil reptiles has been known only in a few marine groups: ichthyosaurs, pachypleurosaurs, and mosasaurs. Here, we report a pregnant specimen of the Early Cretaceous Hyphalosaurus baitaigouensis, a species of Choristodera, a diapsid group known from unequivocal fossil remains from the Middle Jurassic to the early Miocene (about 165 to 20 million years ago). This specimen provides the first evidence of viviparity in choristoderan reptiles and is also the sole record of viviparity in fossil reptiles which lived in freshwater ecosystems. This exquisitely preserved specimen contains up to 18 embryos arranged in pairs. Size comparison with small free-living individuals and the straight posture of the posterior-most pair suggest that those embryos were at term and had probably reached parturition. The posterior-most embryo on the left side has the head positioned toward the rear, contrary to normal position, suggesting a complication that may have contributed to the mother's death. Viviparity would certainly have freed species of Hyphalosaurus from the need to return to land to deposit eggs; taking this advantage, they would have avoided intense competition with contemporaneous terrestrial carnivores such as dinosaurs.
*Suteethorn, S., Le Loeuff, J., Buffetaut, E., and Suteethorn, V. 2010. Description of topotypes of Phuwiangosaurus sirindhornae, a sauropod from the Sao Khua Formation (Early Cretaceous) of Thailand, and their phylogenetic implications. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 256(1):109-121.
The holotype of Phuwiangosaurus sirindhornae Martin, Buffetaut and Suteethorn 1994, a 10 % complete sauropod skeleton, was excavated in the early 1980s by a Thai-French expedition. In 1993, the site was reopened and yielded two additional vertebrae: one posterior dorsal and one proximal caudal vertebra. On the basis of the size and shape of the vertebrae and the absence of identical bones from the type locality, we conclude that these vertebrae belong to the same individual as the holotype of P. sirindhornae and consider them as topotypes. A phylogenetic analysis, which for the first time includes recently described cranial and postcranial material, indicates that Phuwiangosaurus is a basal member of Titanosauriformes.
*Carballidoa J.L. & Pol D. In press. The dentition of Amygdalodon patagonicus (Dinosauria: Sauropoda) and the dental evolution in basal sauropods. Comptes Rendus Palevol.
Amygdalodon patagonicus is the oldest record of Sauropoda from South America and is known from several teeth and fragmentary postcranial remains. Here we describe in detail its dental morphology, characterized by the presence of broad spatulated teeth (with low SI values) and the absence of denticles in their crowns. The enamel bears a particular wrinkling pattern composed only of apicobasally-aligned pits, which are frequently joined to each other by a continuous sulcus. Some worn teeth have large wear-facets that extend over only one of the crown's edges. This unique combination of characters provides a proper diagnosis for Amygdalodon. Despite the fragmentary available material, Amygdalodon is here interpreted as a non-eusauropod sauropod based on the results of a phylogenetic analysis. The presence of derived dental characters in Amygdalodon, such as the presence of tooth-tooth occlusion, shows several features previously thought to diagnose Eusauropoda or Gravisauria appeared earlier during the early evolution of sauropods.
*Xu, X., Zheng, X., and You, H. 2010. Exceptional dinosaur fossils show ontogenetic development of early feathers. Nature 464:1338-1341.
Recent discoveries of feathered dinosaur specimens have greatly improved our understanding of the origin and early evolution of feathers, but little information is available on the ontogenetic development of early feathers. Here we describe an early-juvenile specimen and a late-juvenile specimen, both referable to the oviraptorosaur Similicaudipteryx, recovered from the Lower Cretaceous Yixian Formation of western Liaoning, China. The two specimens have strikingly different remiges and rectrices, suggesting that a radical morphological change occurred during feather development, as is the case for modern feathers. However, both the remiges and the rectrices are proximally ribbon-like in the younger specimen but fully pennaceous in the older specimen, a pattern not known in any modern bird. In combination with the wide distribution of proximally ribbon-like pennaceous feathers and elongate broad filamentous feathers among extinct theropods, this find suggests that early feathers were developmentally more diverse than modern ones and that some developmental features, and the resultant morphotypes, have been lost in feather evolution.
Posté par Lolo
Les deux sur les Sauropodes m'intéressent 
Posté par Theropod
Et moi j'aimerais bien les deux sur les Choristodères et celui sur les plumes...
Posté par Naldo
Merci pour ces liens, Tiki
Juste un truc à propos des Choristodères. J'ai pas encore lu les articles, mais l'un qui déclare qu'Hyphalosaurus baitagouensis pondait des oeufs à coquille molle et l'autre qui clame que la même espèce était vivipare, ça serait pas un peu contradictoire ?
Sinon, dans le même Naturwissenschaften, y'a aussi Abydosaurus, et un article sur une conservation tégumentaire chez Psittacosaurus.
Juste un truc à propos des Choristodères. J'ai pas encore lu les articles, mais l'un qui déclare qu'Hyphalosaurus baitagouensis pondait des oeufs à coquille molle et l'autre qui clame que la même espèce était vivipare, ça serait pas un peu contradictoire ?
Sinon, dans le même Naturwissenschaften, y'a aussi Abydosaurus, et un article sur une conservation tégumentaire chez Psittacosaurus.
Posté par Utahraptor
Découverte d'un Tyrannosauroidae en Sibérie datant du Jurassique moyen: Kileskus aristotocus.
Source: dinodata
Source: dinodata
Posté par Theropod
Voici l'article: (mais on en avait déjà parlé, je crois).
http://www.zin.ru/journals/trudyzin/doc/vol_314_1/TZ_314_1_Averianov.pdf
http://www.zin.ru/journals/trudyzin/doc/vol_314_1/TZ_314_1_Averianov.pdf
Posté par Utahraptor
Oups! Mes excuses alors...
Posté par Tikémi
*MARTÍN D. EZCURRA, FEDERICO L. AGNOLIN & FERNANDO E. NOVAS. An abelisauroid dinosaur with a non-atrophied manus from the Late Cretaceous Pari Aike Formation of southern Patagonia. Zootaxa 2450: 1–25 (10 May 2010)
Description de Austrocheirus isasii
Description de Austrocheirus isasii
Posté par Pyroraptor
Tu as le papier tiky?
Ca semble etre plutot interessant comme petit papier
Ca semble etre plutot interessant comme petit papier
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