Re: [2010] Brèves paléontologiquesPosté par Tikémi
Nizar Ibrahim, David M. Unwin, David M. Martill, Lahssen Baidder, Samir Zouhri. A New Pterosaur (Pterodactyloidea: Azhdarchidae) from the Upper Cretaceous of Morocco. PLoS ONE
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0010875
Alanqa saharica
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0010875
Alanqa saharica
Posté par Pyroraptor
Une découverte en provenance du Maroc fort sympathique:
http://www.insu.cnrs.fr/a3503,maroc-decouverte-une-faune-exceptionnelle-bouleverse-scenarios-evolutifs.html
Vraiment superbe.
http://www.insu.cnrs.fr/a3503,maroc-decouverte-une-faune-exceptionnelle-bouleverse-scenarios-evolutifs.html
Vraiment superbe.
Posté par Naldo
J'en avais déjà parlé dans "Inventaire PDF".
* Ordovician faunas of Burgess Shale type
Peter Van Roy1,2, Patrick J. Orr2, Joseph P. Botting3, Lucy A. Muir4, Jakob Vinther1, Bertrand Lefebvre5, Khadija el Hariri6 & Derek E. G. Briggs1,7
En effet, c'est assez impressionnant.
* Ordovician faunas of Burgess Shale type
Peter Van Roy1,2, Patrick J. Orr2, Joseph P. Botting3, Lucy A. Muir4, Jakob Vinther1, Bertrand Lefebvre5, Khadija el Hariri6 & Derek E. G. Briggs1,7
En effet, c'est assez impressionnant.
Posté par Utahraptor
Pfiouuu! Un petit dinosaure hongrois...j'ai cru que j'étais tombé sur un site d'information politique. 
Posté par Lolo
- First ceratopsid dinosaur from China and its biogeographical implications
Ceratopsid dinosaurs represent one of the best known dinosaur groups in the Late Cretaceous, and their unquestionable fossil rec-ords are exclusively restricted to western North America. Here we report a new ceratopsid dinosaur, Sinoceratops zhuchengensis gen. et sp. nov., from the Upper Cretaceous Wangshi Group of Zhucheng, Shandong Province, China. Cladistic analysis places this new taxon as the only known ceratopsid from outside North America, in a basal position within the Centrosaurinae. It is con-siderably larger than most other centrosaurines but similar in size to basal chasmosaurines. Furthermore, it is more similar to chasmosaurines than to other centrosaurines in several features, thus blurring the distinction of the two ceratopsid subgroups. This new find not only provides significant information on the morphological transition from non-ceratopsid to ceratopsid dinosaurs, but also complicates the biogeography of the Ceratopsidae, and further demonstrates that fossil sampling has profound effects on recon-structing dinosaurian biogeography.
Sinoceratops zhuchengensis gen. et sp. nov
- à noter 8 (!) nouveaux ceratopsiens dans ce livre:
http://www.amazon.fr/gp/product/images/0253353580/sr=8-1/qid=1274976579/ref=dp_image_0?ie=UTF8&n=52042011&s=english-books&qid=1274976579&sr=8-1... bientôt dispo chez nous, déjà dispo aux USA
Ceratopsid dinosaurs represent one of the best known dinosaur groups in the Late Cretaceous, and their unquestionable fossil rec-ords are exclusively restricted to western North America. Here we report a new ceratopsid dinosaur, Sinoceratops zhuchengensis gen. et sp. nov., from the Upper Cretaceous Wangshi Group of Zhucheng, Shandong Province, China. Cladistic analysis places this new taxon as the only known ceratopsid from outside North America, in a basal position within the Centrosaurinae. It is con-siderably larger than most other centrosaurines but similar in size to basal chasmosaurines. Furthermore, it is more similar to chasmosaurines than to other centrosaurines in several features, thus blurring the distinction of the two ceratopsid subgroups. This new find not only provides significant information on the morphological transition from non-ceratopsid to ceratopsid dinosaurs, but also complicates the biogeography of the Ceratopsidae, and further demonstrates that fossil sampling has profound effects on recon-structing dinosaurian biogeography.
Sinoceratops zhuchengensis gen. et sp. nov
- à noter 8 (!) nouveaux ceratopsiens dans ce livre:
http://www.amazon.fr/gp/product/images/0253353580/sr=8-1/qid=1274976579/ref=dp_image_0?ie=UTF8&n=52042011&s=english-books&qid=1274976579&sr=8-1... bientôt dispo chez nous, déjà dispo aux USA
Posté par Lolo
dont Diabloceratops, Medusaceratops, Coahuilaceratops, Rubeosaurus, Tatankaceratops, Ojoceratops...
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Edité le 29/05/2010 à 13:42 par lolo
Posté par Spinosdu93
A New Pterosaur (Pterodactyloidea: Azhdarchidae) from the Upper Cretaceous of Morocco
The Kem Kem beds in South Eastern Morocco contain a rich early Upper (or possibly late Lower) Cretaceous vertebrate assemblage. Fragmentary remains, predominantly teeth and jaw tips, represent several kinds of pterosaur although only one species, the ornithocheirid Coloborhynchus moroccensis, has been named. Here, we describe a new azhdarchid pterosaur, Alanqa saharica nov. gen. nov. sp., based on an almost complete well preserved mandibular symphysis from Aferdou N'Chaft. We assign additional fragmentary jaw remains, some of which have been tentatively identified as azhdarchid and pteranodontid, to this new taxon which is distinguished from other azhdarchids by a remarkably straight, elongate, lance-shaped mandibular symphysis that bears a pronounced dorsal eminence near the posterior end of its dorsal (occlusal) surface. Most remains, including the holotype, represent individuals of approximately three to four meters in wingspan, but a fragment of a large cervical vertebra, that probably also belongs to A. saharica, suggests that wingspans of six meters were achieved in this species. The Kem Kem beds have yielded the most diverse pterosaur assemblage yet reported from Africa and provide the first clear evidence for the presence of azhdarchids in Gondwana at the start of the Late Cretaceous. This, the relatively large size achieved by Alanqa, and the additional evidence of variable jaw morphology in azhdarchids provided by this taxon, indicates a longer and more complex history for this clade than previously suspected.
Le lien vers PlosOne
The Kem Kem beds in South Eastern Morocco contain a rich early Upper (or possibly late Lower) Cretaceous vertebrate assemblage. Fragmentary remains, predominantly teeth and jaw tips, represent several kinds of pterosaur although only one species, the ornithocheirid Coloborhynchus moroccensis, has been named. Here, we describe a new azhdarchid pterosaur, Alanqa saharica nov. gen. nov. sp., based on an almost complete well preserved mandibular symphysis from Aferdou N'Chaft. We assign additional fragmentary jaw remains, some of which have been tentatively identified as azhdarchid and pteranodontid, to this new taxon which is distinguished from other azhdarchids by a remarkably straight, elongate, lance-shaped mandibular symphysis that bears a pronounced dorsal eminence near the posterior end of its dorsal (occlusal) surface. Most remains, including the holotype, represent individuals of approximately three to four meters in wingspan, but a fragment of a large cervical vertebra, that probably also belongs to A. saharica, suggests that wingspans of six meters were achieved in this species. The Kem Kem beds have yielded the most diverse pterosaur assemblage yet reported from Africa and provide the first clear evidence for the presence of azhdarchids in Gondwana at the start of the Late Cretaceous. This, the relatively large size achieved by Alanqa, and the additional evidence of variable jaw morphology in azhdarchids provided by this taxon, indicates a longer and more complex history for this clade than previously suspected.
Le lien vers PlosOne
Posté par Tikémi
Homo gautengensisCurnoe (2010). A review of early Homo in southern Africa focusing on cranial, mandibular and dental remains, with the description of a new species (Homo gautengensis sp. nov.). HOMO - Journal of Comparative Human Biology (online early). doi:10.1016/j.jchb.2010.04.002
The southern African sample of early Homo is playing an increasingly important role in understanding the origins, diversity and adaptations of the human genus. Yet, the affinities and classification of these remains continue to be in a state of flux. The southern African sample derives from five karstic palaeocave localities and represents more than one-third of the total African sample for this group; sampling an even wider range of anatomical regions than the eastern African collection. Morphological and phenetic comparisons of southern African specimens covering dental, mandibular and cranial remains demonstrate this sample to contain a species distinct from known early Homo taxa. The new species Homo gautengensis sp. nov. is described herein: type specimen Stw 53; Paratypes SE 255, SE 1508, Stw 19b/33, Stw 75–79, Stw 80, Stw 84, Stw 151, SK 15, SK 27, SK 45, SK 847, SKX 257/258, SKX 267/268, SKX 339, SKX 610, SKW 3114 and DNH 70. H. gautengensis is identified from fossils recovered at three palaeocave localities with current best ages spanning 2.0 to 1.26–0.82 million years BP. Thus, H. gautengensis is probably the earliest recognised species in the human genus and its longevity is apparently well in excess of H. habilis.
Posté par Cymbospondylus
Ca,ca m'intéresse 
Posté par Theropod
Me too...
Posté par Naldo
Mouais, ça commence à devenir le bord** le genre Homo.
Posté par Axel421
Je m'intéresse pas trop au genre Homo qu'il y ait une découverte j'en m'en fous un peu et comme tu dis Naldo c'est bordellique leur truc j'y comprend plus rien enfin
On trouve pas mal de ptérosaures en ce moment je trouve ...
On trouve pas mal de ptérosaures en ce moment je trouve ...
Posté par Theropod
Forcément, il y a tellement de chercheurs qui travaillent là dessus qu'on commence à en connaître des espèces, d'autant plus que ces découvertes concernent des périodes récentes. Pour la lignée des chimpanzés, on connaît moins d'espèces! Et puis ça n'intéresse peut-être moins de monde.
Mais des groupes un peu "poubelles" il y en a ailleurs aussi, même les dinosaures ont les leurs...
Mais des groupes un peu "poubelles" il y en a ailleurs aussi, même les dinosaures ont les leurs...
Posté par Spinosdu93
Articulated skeletons of the aetosaur Typothorax coccinarum Cope (Archosauria: Stagonolepididae) from the Upper Triassic Bull Canyon Formation (Revueltian: early-mid Norian), eastern New Mexico, USA
We report two nearly complete, articulated skeletons of the crurotarsan archosaur Typothorax coccinarum from the Upper Triassic Bull Canyon Formation of east-central New Mexico. These are the most complete, articulated aetosaurs from North America and provide a wealth of new anatomical and paleobiological data, including articulated presacral armor that confirms the distinctiveness of T. coccinarum from the closely related T. antiquum and from Redondasuchus. Cervical vertebrae are small, but the corresponding reduction in armor is accomplished by a reduced number of cervical osteoderms. The third row of osteoderms includes a thin, elongate, lateral spike. The ventral armor consists of 10 thoracic columns and four caudal columns of osteoderms. Spiked osteoderms near the cloacal vent are the first spikes reported in aetosaurian ventral osteoderms. The forelimb of T. coccinarum was very short, only ∼0.65 the length of the hind limb, possesses some adaptations found in digging taxa, and was held in a sprawling or 'semi-erect' position. In contrast the hind limb is much more robust, 'pillar erect,' and functionally mesotarsal. The articulated pes, including unguals, has, minimally, the phalangeal formula 2-3-3?-4?-3? with relative digit lengths III > II > IV > I > V, digits I-IV equally as wide as long and other characteristics of the footprint ichnogenus Brachychirotherium, often attributed to an aetosaurian trackmaker. Both specimens are ∼2.5 m long and the preserved armor and limb bones are as large or larger than known Typothorax fossils, suggesting that this approximates the upper size limit of T. coccinarum, and we calculate body mass estimates of ∼100-104 kg for both specimens.
Pour voir l'article en ligne
We report two nearly complete, articulated skeletons of the crurotarsan archosaur Typothorax coccinarum from the Upper Triassic Bull Canyon Formation of east-central New Mexico. These are the most complete, articulated aetosaurs from North America and provide a wealth of new anatomical and paleobiological data, including articulated presacral armor that confirms the distinctiveness of T. coccinarum from the closely related T. antiquum and from Redondasuchus. Cervical vertebrae are small, but the corresponding reduction in armor is accomplished by a reduced number of cervical osteoderms. The third row of osteoderms includes a thin, elongate, lateral spike. The ventral armor consists of 10 thoracic columns and four caudal columns of osteoderms. Spiked osteoderms near the cloacal vent are the first spikes reported in aetosaurian ventral osteoderms. The forelimb of T. coccinarum was very short, only ∼0.65 the length of the hind limb, possesses some adaptations found in digging taxa, and was held in a sprawling or 'semi-erect' position. In contrast the hind limb is much more robust, 'pillar erect,' and functionally mesotarsal. The articulated pes, including unguals, has, minimally, the phalangeal formula 2-3-3?-4?-3? with relative digit lengths III > II > IV > I > V, digits I-IV equally as wide as long and other characteristics of the footprint ichnogenus Brachychirotherium, often attributed to an aetosaurian trackmaker. Both specimens are ∼2.5 m long and the preserved armor and limb bones are as large or larger than known Typothorax fossils, suggesting that this approximates the upper size limit of T. coccinarum, and we calculate body mass estimates of ∼100-104 kg for both specimens.
Pour voir l'article en ligne
Posté par Naldo
Je viens de le télécharger
Enfin, vous conviendrez que parmi toutes ces espèces du genre Homo, une bonne partie ne correspondent peut-être pas à des espèces.
Un peu comme "l'homme de Denisova", il serait une nouvelle espèce car son ADN mitochondrial montre une divergence antérieure à celle de la lignée néanderthalienne. Mais à ce que j'en sais (corrigez-moi si je me trompe), on ne sait même pas si H. neanderthalensis est une espèce distincte d'H. sapiens.
Et d'ailleurs, qu'est ce qu'une espèce pour une bestiole à l'histoire biogéographique aussi complexe que l'homme ?
Enfin, vous conviendrez que parmi toutes ces espèces du genre Homo, une bonne partie ne correspondent peut-être pas à des espèces.
Un peu comme "l'homme de Denisova", il serait une nouvelle espèce car son ADN mitochondrial montre une divergence antérieure à celle de la lignée néanderthalienne. Mais à ce que j'en sais (corrigez-moi si je me trompe), on ne sait même pas si H. neanderthalensis est une espèce distincte d'H. sapiens.
Et d'ailleurs, qu'est ce qu'une espèce pour une bestiole à l'histoire biogéographique aussi complexe que l'homme ?
Posté par Tikémi
Ou plus simplement, quand on trouve de l'anthropoïde fossile, ça fait mieux de dire "on a trouvé l'ancêtre de l'homme" que "on a trouvé l'ancêtre du chimpanzé". Y a rien à faire, on va d'office parler comme ça.
Et puis Toumaï est un singe, et toc !
Posté par Naldo
L'homme aussi est un singe en même temps. 
Posté par Spinosdu93
Pas exactement 
A ma connaissance le genre humain et les singes sont tous deux des primates mais l'Homme n'est pas un singe.
A ma connaissance le genre humain et les singes sont tous deux des primates mais l'Homme n'est pas un singe.
Posté par Charlie
je crois qu'il est temps de réviser tes connaissances...
Posté par Spinosdu93
D'accord j'ai capté le message désolé pour le dérangement 
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