Re: [2010] Brèves paléontologiquesPosté par Tikémi
ALBERT PRIETO-MÁRQUEZ, 2010. Glishades ericksoni, a new hadrosauroid (Dinosauria: Ornithopoda) from the Late Cretaceous of North America. Zootaxa 2452: 1–17
connu par un prémaxillaire uniquement...
connu par un prémaxillaire uniquement...
Posté par Lolo
Crotte, ces noms quand même
Posté par Naldo
Dans mes bras lolo !
[membre du comité de lutte contre les noms taxonomiques moches]
[membre du comité de lutte contre les noms taxonomiques moches]
Posté par Theropod
Il faut dire aussi qu'avec tout ce qu'on nomme, les stocks doivent pêtre épuisés. C'est la même chose pour les astéroïdes, maintenant il y en a qui s'appellent Les Beatles, car on n'avait plus de figure mythologique en réserve. Et puis peut-être aussi que de moins en moins de personnes étudient les langues mortes.
Posté par Naldo
Pas besoin de connaitre les langues mortes... C'est du latin/grec de cuisine tout ça.
Les noms taxonomiques sont sensés être faciles à prononcer (au moins) et à retenir...
A mon avis, ils se foulent pas trop. Bon, je veux bien leur concéder Tiktaalik, pour qui j'ai un faible.
Les noms taxonomiques sont sensés être faciles à prononcer (au moins) et à retenir...
A mon avis, ils se foulent pas trop. Bon, je veux bien leur concéder Tiktaalik, pour qui j'ai un faible.
Posté par Tikémi
Du poil dans de l'ambre de Charente-Maritime (on trouvait vraiment n'importe quoi là dedans 
)
*Vullo, Girard, Azar & Neraudeau 2010. "Mammalian hairs in Early Cretaceous amber" Naturwissenschaften. 10.1007/s00114-010-0677-8 (Online First)
Abstract : Two mammalian hairs have been found in association with an empty puparium in a ~100-million-year-old amber (Early Cretaceous) from France. Although hair is known to be an ancestral, ubiquitous feature in the crown Mammalia, the structure of Mesozoic hair has never been described. In contrast to fur and hair of some Jurassic and Cretaceous mammals preserved as carbonized filaments, the exceptional preservation of the fossils described here allows for the study of the cuticular structure. Results show the oldest direct evidence of hair with a modern scale pattern. This discovery implies that the morphology of hair cuticula may have remained unchanged throughout most of mammalian evolution. The association of these hairs with a possible fly puparium provides paleoecological information and indicates peculiar taphonomic conditions.
)*Vullo, Girard, Azar & Neraudeau 2010. "Mammalian hairs in Early Cretaceous amber" Naturwissenschaften. 10.1007/s00114-010-0677-8 (Online First)
Abstract : Two mammalian hairs have been found in association with an empty puparium in a ~100-million-year-old amber (Early Cretaceous) from France. Although hair is known to be an ancestral, ubiquitous feature in the crown Mammalia, the structure of Mesozoic hair has never been described. In contrast to fur and hair of some Jurassic and Cretaceous mammals preserved as carbonized filaments, the exceptional preservation of the fossils described here allows for the study of the cuticular structure. Results show the oldest direct evidence of hair with a modern scale pattern. This discovery implies that the morphology of hair cuticula may have remained unchanged throughout most of mammalian evolution. The association of these hairs with a possible fly puparium provides paleoecological information and indicates peculiar taphonomic conditions.
Posté par Lolo
On trouve même du raptor aux cheveux longs, alors suis pas étonné 
Posté par Lolo
Une nouvelle vache dans JVP:
Mcdonald, Andrew T. , Wolfe, Douglas G. andKirkland, James I. 'A new basal
hadrosauroid (Dinosauria: Ornithopoda) from the Turonian of New Mexico',
Journal of Vertebrate Paleontology, 30:3, 799 - 812
plus d'autres trucs, notamment un papier qui donne des estimations sur la masse corporelle des Pteros, qui fait jaser ...
Mcdonald, Andrew T. , Wolfe, Douglas G. andKirkland, James I. 'A new basal
hadrosauroid (Dinosauria: Ornithopoda) from the Turonian of New Mexico',
Journal of Vertebrate Paleontology, 30:3, 799 - 812
plus d'autres trucs, notamment un papier qui donne des estimations sur la masse corporelle des Pteros, qui fait jaser ...
Posté par Theropod
Tu pourrais me passer ces papiers sur les masses corporelles des ptérosaures? Ca m'intéresse, surtout que j'ai vu une estimation à 17 kg pour Pteranodon, ce qui m'a paru un peu léger.
Posté par Lolo
Je les ai pas encore
Posté par Naldo
Aurais-tu la référence s'il te plaît ?
Posté par Lolo
Henderson, Donald M. 'Pterosaur body mass estimates from three-dimensional
mathematical slicing', Journal of Vertebrate Paleontology, 30:3, 768 - 785
mathematical slicing', Journal of Vertebrate Paleontology, 30:3, 768 - 785
Posté par Naldo
Merci bien 
Posté par Gigy
17 kilos me semble assez bon pour les ornithocheiroidea, les os sont totalement creux, la tête est plus longue que le corps, en fait un pteranodon de 7 mètre à le corps d'une dinde! donc extrêmement réduit et c'est encore plus vrai pour les ornithocheiroidea anciens que j'ai étudié.
Posté par Lolo
Nouveau Acta Sinica:
- Fukuititan nipponensis, A New Titanosauriform Sauropod from the Early Cretaceous Tetori Group of Fukui Prefecture, Japan.
A titanosauriform dinosaur: Fukuititan nipponensis gen. et sp. nov. is erected based on the incomplete skeleton. It is characterized by elongated asymmetric tooth crown with a weak or absent labial groove and without lingual concavity; stalk-like epipophysis of cervical vertebra; the transverse width of the proximal end of the humerus approximately 32% of the humerus length; metacarpal longer, approximately 48% of the radius and the distal end of the ischia slightly expanded. It represents the first relatively complete titanosauriform skeleton found from Japan. The discovery of Fukuititan indicates that the diversity and geographical distribution of Titanosauriformes are much higher than the previous thought
- Morphology and Histology of Lattice-like Ossified Epaxial Tendons in Psittacosaurus (Dinosauria: Ceratopsia)
Epaxial tendons play an important role in the study of the musculoskeletal system and locomotory style of dinosaurs. Although the ossified epaxial tendon lattice is fairly well known in Iguanodontoidea, only recently has knowledge of this complex been extended to ceratopsians. This study concerns the gross morphology and microstructure of the tendon lattice in Psittacosaurus, a basal ceratopsian. As in the neoceratopsian Chasmosaurus, the ossified tendons of Psittacosaurus form a three-layered, lattice-like structure. The microstructure of the tendons in large psittacosaur individuals retains an early stage of ossification, as in juvenile birds and nestling hadrosaurs, suggesting a slow developmental rate of ossification of the tendons in psittacosaur ontogeny. Comparative study indicates that a lattice-like arrangement of three-layered epaxial tendons is widely distributed in Cerapoda. This pattern also extends to Ankylosauria, implying a similar pattern of the epaxial muscles through the ornithischian clade. In addition, comparison with crocodiles implies that the different morphology of ossified tendons in dinosaurs may be associated with adaptive aspects of their paleobiology, not simply a side effect of skeletal ossification. In contrast to the short tendons in quadrupedal Chasmosaurus and Protoceratops, the elongated tendons in Psittacosaurus may be related to the bipedal locomotion characteristic of this taxon.
- A New Sapeornithid Bird from China and Its Implication for Early Avian Evolution
Recent discoveries of basal birds have greatly improved our understanding of early bird evolution, yet the evolution of several important features such as cranial kinesis and arboreality remain debated. A new sapeornithid bird, Shenshiornis primita gen. et sp. nov., based on an articulated skeleton from the Early Cretaceous Jehol Group of western Liaoning, China, sheds new light on these issues. Shenshiornis possesses a skull as primitive as or even more primitive than that of Archaeopteryx and hind limbs modified for an improved arboreal capability. A cladistic analysis shows that: 1) presence of a diapsid skull is a plesiomorphy of the Aves and a kinetic skull evolved incrementally later in avian evolution; and 2) cursorial capability significantly weakens at the base of the Pygostylia due to a change in locomotor system.
- Fukuititan nipponensis, A New Titanosauriform Sauropod from the Early Cretaceous Tetori Group of Fukui Prefecture, Japan.
A titanosauriform dinosaur: Fukuititan nipponensis gen. et sp. nov. is erected based on the incomplete skeleton. It is characterized by elongated asymmetric tooth crown with a weak or absent labial groove and without lingual concavity; stalk-like epipophysis of cervical vertebra; the transverse width of the proximal end of the humerus approximately 32% of the humerus length; metacarpal longer, approximately 48% of the radius and the distal end of the ischia slightly expanded. It represents the first relatively complete titanosauriform skeleton found from Japan. The discovery of Fukuititan indicates that the diversity and geographical distribution of Titanosauriformes are much higher than the previous thought
- Morphology and Histology of Lattice-like Ossified Epaxial Tendons in Psittacosaurus (Dinosauria: Ceratopsia)
Epaxial tendons play an important role in the study of the musculoskeletal system and locomotory style of dinosaurs. Although the ossified epaxial tendon lattice is fairly well known in Iguanodontoidea, only recently has knowledge of this complex been extended to ceratopsians. This study concerns the gross morphology and microstructure of the tendon lattice in Psittacosaurus, a basal ceratopsian. As in the neoceratopsian Chasmosaurus, the ossified tendons of Psittacosaurus form a three-layered, lattice-like structure. The microstructure of the tendons in large psittacosaur individuals retains an early stage of ossification, as in juvenile birds and nestling hadrosaurs, suggesting a slow developmental rate of ossification of the tendons in psittacosaur ontogeny. Comparative study indicates that a lattice-like arrangement of three-layered epaxial tendons is widely distributed in Cerapoda. This pattern also extends to Ankylosauria, implying a similar pattern of the epaxial muscles through the ornithischian clade. In addition, comparison with crocodiles implies that the different morphology of ossified tendons in dinosaurs may be associated with adaptive aspects of their paleobiology, not simply a side effect of skeletal ossification. In contrast to the short tendons in quadrupedal Chasmosaurus and Protoceratops, the elongated tendons in Psittacosaurus may be related to the bipedal locomotion characteristic of this taxon.
- A New Sapeornithid Bird from China and Its Implication for Early Avian Evolution
Recent discoveries of basal birds have greatly improved our understanding of early bird evolution, yet the evolution of several important features such as cranial kinesis and arboreality remain debated. A new sapeornithid bird, Shenshiornis primita gen. et sp. nov., based on an articulated skeleton from the Early Cretaceous Jehol Group of western Liaoning, China, sheds new light on these issues. Shenshiornis possesses a skull as primitive as or even more primitive than that of Archaeopteryx and hind limbs modified for an improved arboreal capability. A cladistic analysis shows that: 1) presence of a diapsid skull is a plesiomorphy of the Aves and a kinetic skull evolved incrementally later in avian evolution; and 2) cursorial capability significantly weakens at the base of the Pygostylia due to a change in locomotor system.
Posté par Lolo
- A new species of Azendohsaurus (Diapsida: Archosauromorpha) from the Triassic Isalo Group of southwestern Madagascar: cranium and mandible
Here, we describe a new species of Azendohsaurus from the Middle–Late Triassic of Madagascar, extending the geographical range of a taxon known otherwise only by a single species from Morocco. Although Azendohsaurus has consistently been regarded as an early dinosaur (based on various advanced dental and gnathic features resembling those characterizing certain dinosaur subgroups), the relatively complete skeletal material, now available from Madagascar, argues strongly against its dinosaurian affinities. Rather, the retention of numerous primitive cranial and postcranial features indicates a surprisingly early divergence of Azendohsaurus within Archosauromorpha and an unusual mosaic of characters in this taxon. Features considered diagnostic of Sauropodomorpha thus are inferred to occur homoplastically in at least one clade of nondinosaurian archosauromorphs, indicating a complex evolution and distribution of features traditionally thought to be derived within archosaurs. Azendohsaurus has teeth resembling those of both early sauropodomorph and ornithischian dinosaurs, yet also possesses numerous inarguable basal archosauromorph cranial and postcranial attributes. This highlights the risk of uncritically referring isolated, Middle–Late Triassic (or even later), 'leaf-shaped' teeth with denticles to the Dinosauria. Similarly, the occurrence of such teeth in an early diverging archosauromorph indicates that specializations for herbivory originated more frequently within this clade than conventionally assumed. For example, Azendohsaurus and numerous basal sauropodomorph dinosaur taxa share an array of convergently acquired features associated with herbivory, including tooth denticles, expanded tooth crowns, a downturned dentary and the articular located at the ventral margin of the mandible. Some of these features (denticles, expanded crowns and the ventrally deflected articular) are even more widespread among archosauromorphs, including aetosaurs, silesaurs and ornithischian dinosaurs. A downturned dentary also occurs in Trilophosaurus, a taxon further marked by unique specializations for herbivory, including transversely lophate, tricuspid teeth. An array of features associated with herbivory also occurs in rhynchosaurs and certain crocodilians (e.g. Simosuchus). This distribution suggests that craniodental features associated with herbivory were much more pervasive across the archosauromorph clade than previously recognized, possibly evolving at least six to eight times independently.
Nous devons oter un genre de dinos de nos listes: Azendohsaurus est maintenant un archosaure proche des Sauropodomorphes.
Here, we describe a new species of Azendohsaurus from the Middle–Late Triassic of Madagascar, extending the geographical range of a taxon known otherwise only by a single species from Morocco. Although Azendohsaurus has consistently been regarded as an early dinosaur (based on various advanced dental and gnathic features resembling those characterizing certain dinosaur subgroups), the relatively complete skeletal material, now available from Madagascar, argues strongly against its dinosaurian affinities. Rather, the retention of numerous primitive cranial and postcranial features indicates a surprisingly early divergence of Azendohsaurus within Archosauromorpha and an unusual mosaic of characters in this taxon. Features considered diagnostic of Sauropodomorpha thus are inferred to occur homoplastically in at least one clade of nondinosaurian archosauromorphs, indicating a complex evolution and distribution of features traditionally thought to be derived within archosaurs. Azendohsaurus has teeth resembling those of both early sauropodomorph and ornithischian dinosaurs, yet also possesses numerous inarguable basal archosauromorph cranial and postcranial attributes. This highlights the risk of uncritically referring isolated, Middle–Late Triassic (or even later), 'leaf-shaped' teeth with denticles to the Dinosauria. Similarly, the occurrence of such teeth in an early diverging archosauromorph indicates that specializations for herbivory originated more frequently within this clade than conventionally assumed. For example, Azendohsaurus and numerous basal sauropodomorph dinosaur taxa share an array of convergently acquired features associated with herbivory, including tooth denticles, expanded tooth crowns, a downturned dentary and the articular located at the ventral margin of the mandible. Some of these features (denticles, expanded crowns and the ventrally deflected articular) are even more widespread among archosauromorphs, including aetosaurs, silesaurs and ornithischian dinosaurs. A downturned dentary also occurs in Trilophosaurus, a taxon further marked by unique specializations for herbivory, including transversely lophate, tricuspid teeth. An array of features associated with herbivory also occurs in rhynchosaurs and certain crocodilians (e.g. Simosuchus). This distribution suggests that craniodental features associated with herbivory were much more pervasive across the archosauromorph clade than previously recognized, possibly evolving at least six to eight times independently.
Nous devons oter un genre de dinos de nos listes: Azendohsaurus est maintenant un archosaure proche des Sauropodomorphes.
Posté par Theropod
Mais sa ressemblance avec les Sauropodomorphes ne signifie pas qu'il soit plus proche d'eux que des Ornitischiens ou des Théropodes, par exemple. Sinon, les dinosaures seraient paraphylétiques.
En fait ils disent surtout que Azendhosaurus était branché bien plus basalement qu'on le pensait dans l'arbre des Archosauromorphes. Leurs ressemblance avec les silesauridés, Aetosauridé et Sauropodomorphes
En fait ils disent surtout que Azendhosaurus était branché bien plus basalement qu'on le pensait dans l'arbre des Archosauromorphes. Leurs ressemblance avec les silesauridés, Aetosauridé et Sauropodomorphes
Posté par Theropod
Désolé, ça a coupé et je ne peux pas éditer.
Je continue:
Leurs ressemblances avec les silesauridés, Aetosauridés et Sauropodomorphes ne sont que des homoplasies.
Je continue:
Leurs ressemblances avec les silesauridés, Aetosauridés et Sauropodomorphes ne sont que des homoplasies.
Posté par Lolo
Un ceratopsien hongrois !
- Ősi, A., R.J. Butler & David B. Weishampel. 2010. A Late Cretaceous
ceratopsian dinosaur from Europe with Asian affinities. Nature 465: 466-468.
Ceratopsians (horned dinosaurs) represent a highly diverse and abundant
radiation of non-avian dinosaurs1, 2, 3, 4, 5 known primarily from the
Cretaceous period (65-145 million years ago). This radiation has been
considered to be geographically limited to Asia and western North America1,
2, 3, with only controversial remains reported from other continents. Here
we describe new ceratopsian cranial material from the Late Cretaceous of
Iharkút, Hungary6, from a coronosaurian ceratopsian, Ajkaceratops kozmai.
Ajkaceratops is most similar to 'bagaceratopsids' such as Bagaceratops and
Magnirostris, previously known only from Late Cretaceous east Asia3, 5, 7,
8. The new material unambiguously demonstrates that ceratopsians occupied
Late Cretaceous Europe and, when considered with the recent discovery of
possible leptoceratopsid teeth from Sweden9, indicates that the clade may
have reached Europe on at least two independent occasions. European Late
Cretaceous dinosaur faunas have been characterized as consisting of a mix of
endemic 'relictual' taxa and 'Gondwanan' taxa, with typical Asian and North
American groups largely absent10, 11. Ajkaceratops demonstrates that this
prevailing biogeographical hypothesis is overly simplified and requires
reassessment. Iharkút was part of the western Tethyan archipelago, a
tectonically complex series of island chains between Africa and Europe12,
and the occurrence of a coronosaurian ceratopsian in this locality may
represent an early Late Cretaceous 'island-hopping' dispersal across the
Tethys Ocean.
- Ősi, A., R.J. Butler & David B. Weishampel. 2010. A Late Cretaceous
ceratopsian dinosaur from Europe with Asian affinities. Nature 465: 466-468.
Ceratopsians (horned dinosaurs) represent a highly diverse and abundant
radiation of non-avian dinosaurs1, 2, 3, 4, 5 known primarily from the
Cretaceous period (65-145 million years ago). This radiation has been
considered to be geographically limited to Asia and western North America1,
2, 3, with only controversial remains reported from other continents. Here
we describe new ceratopsian cranial material from the Late Cretaceous of
Iharkút, Hungary6, from a coronosaurian ceratopsian, Ajkaceratops kozmai.
Ajkaceratops is most similar to 'bagaceratopsids' such as Bagaceratops and
Magnirostris, previously known only from Late Cretaceous east Asia3, 5, 7,
8. The new material unambiguously demonstrates that ceratopsians occupied
Late Cretaceous Europe and, when considered with the recent discovery of
possible leptoceratopsid teeth from Sweden9, indicates that the clade may
have reached Europe on at least two independent occasions. European Late
Cretaceous dinosaur faunas have been characterized as consisting of a mix of
endemic 'relictual' taxa and 'Gondwanan' taxa, with typical Asian and North
American groups largely absent10, 11. Ajkaceratops demonstrates that this
prevailing biogeographical hypothesis is overly simplified and requires
reassessment. Iharkút was part of the western Tethyan archipelago, a
tectonically complex series of island chains between Africa and Europe12,
and the occurrence of a coronosaurian ceratopsian in this locality may
represent an early Late Cretaceous 'island-hopping' dispersal across the
Tethys Ocean.
Posté par Pyroraptor
Il est mimi celui ci et Europeen!
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