[Zbiorczy] Dinozaury 2012 - nowe informacje
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[Zbiorczy] Dinozaury 2012 - nowe informacje
Nowy Cretaceous Research a w nim:
Grzegorz Niedźwiedzki i Tomasz Singer opisują okaz protoceratopsyda z odciskiem stopy:
Niedzwiedzki, Grzegorz; Singer, Tomasz; Gierlinski, Gerard D.; Lockley, Martin G., 2012. A protoceratopsid skeleton with an associated track from the Upper Cretaceous of Mongolia. Cretaceous Research 33 (1): 7-10
O statusie dollodonta, mantellizaura i innych bazalnych iguanodontów:
McDonald, Andrew T. 2012. The status of Dollodon and other basal iguanodonts (Dinosauria: Ornithischia) from the Lower Cretaceous of Europe. Cretaceous Research 33 (1): 1-6
Ząb z Kanady, który uznawano za należący do iguanodonta; jedyny zapis obecności tychże w Ameryce Północnej, okazuje się być zębem ceratopsyda:
Evans, David C.; Barrett, Paul M.; Seymour, Kevin L. , 2012. Revised identification of a reported Iguanodon-grade ornithopod tooth from the Scollard Formation, Alberta, Canada. Cretaceous Research 33 (1): 11-14
O tropach z grupy Dakota w Kolorado:
Kukihara, Reiji; Lockley, Martin G., 2012. Fossil footprints from the Dakota Group (Cretaceous) John Martin Reservoir, Bent County, Colorado: New insights into the paleoecology of the Dinosaur Freeway. Cretaceous Research 33 (1): 165-182
Grzegorz Niedźwiedzki i Tomasz Singer opisują okaz protoceratopsyda z odciskiem stopy:
Niedzwiedzki, Grzegorz; Singer, Tomasz; Gierlinski, Gerard D.; Lockley, Martin G., 2012. A protoceratopsid skeleton with an associated track from the Upper Cretaceous of Mongolia. Cretaceous Research 33 (1): 7-10
O statusie dollodonta, mantellizaura i innych bazalnych iguanodontów:
McDonald, Andrew T. 2012. The status of Dollodon and other basal iguanodonts (Dinosauria: Ornithischia) from the Lower Cretaceous of Europe. Cretaceous Research 33 (1): 1-6
Ząb z Kanady, który uznawano za należący do iguanodonta; jedyny zapis obecności tychże w Ameryce Północnej, okazuje się być zębem ceratopsyda:
Evans, David C.; Barrett, Paul M.; Seymour, Kevin L. , 2012. Revised identification of a reported Iguanodon-grade ornithopod tooth from the Scollard Formation, Alberta, Canada. Cretaceous Research 33 (1): 11-14
O tropach z grupy Dakota w Kolorado:
Kukihara, Reiji; Lockley, Martin G., 2012. Fossil footprints from the Dakota Group (Cretaceous) John Martin Reservoir, Bent County, Colorado: New insights into the paleoecology of the Dinosaur Freeway. Cretaceous Research 33 (1): 165-182
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Re: Dinozaury 2012 - nowe informacje
- Nature, zapewne Volume 481 Number 7380
- Naukowcy obserwując jak agama czerwonogłowa wspomaga się ogonem w trakcie ucieczki opracowali model Velociraptor działający podobnie (a nawet lepiej). Rezultaty badań mogą się przydać przy konstruowaniu sprawniejszych robotów poszukiwawczych:
Thomas Libby, Talia Y. Moore, Evan Chang-Siu, Deborah Li, Daniel J. Cohen, Ardian Jusufi & Robert J. Full (2012)
Tail-assisted pitch control in lizards, robots and dinosaurs.
Nature (advance online publication)
doi:10.1038/nature10710
http://www.nature.com/nature/journal/va ... 10710.html
Informacja prasowa:
http://www.nature.com/news/leaping-liza ... ght-1.9736
- Paleobiology 38(1)
- Do tej pory próbowano łączyć prążkowane ślady zębów z ich twórcami na podstawie szerokości zębów drapieżników współwystępujących z posiadaczem śladów po zębach. Twórcy pracy, posłużywszy się waranem z Komodo (Varanus komodoensis) próbują "wyprodukować" prążkowane ślady zębów i na ich podstawie spróbować stwierdzić, czy można na ich podstawie określić rozmiary zwierzęcia i czy cechy zębów są dokładnie odzwierciedlane przez ich ślady. Co prawda, udaje im się to, ale wykazują szereg ograniczeń stosowanej metody.
Domenic C. D'Amore and Robert J. Blumenschine (2012)
Using striated tooth marks on bone to predict body size in theropod dinosaurs: a model based on feeding observations of Varanus komodoensis, the Komodo monitor.
Paleobiology 38(1):79-100
doi:10.5061/dryad.99qj3
http://www.bioone.org/doi/abs/10.1666/09079.1
- W druku w Cretaceous Research:
- Caudipteryx cierpiał na zwyrodnienie stawów.
Bruce M. Rothschild, Zheng Xiaoting & Larry D. Martin (2012)
Osteoarthritis in the early avian radiation: Earliest recognition of the disease in birds.
Cretaceous Research (advance online publication)
doi:10.1016/j.cretres.2011.12.008
http://www.sciencedirect.com/science/ar ... 7111002084
Abstract
Osteoarthritis is extremely rare in wild mammal populations (less than 1%) and varies in frequency according to species (0--25%) in recent birds, where it is inversely related to size. Large population samples of Early Cretaceous birds in China permit us to analyze its frequency in one of the earliest avian radiations. In these samples, the larger bird (Caudipteryx) shows a high frequency (30%). The earliest previous documentation of primary osteoarthritis in any animal is in a family of Early Cretaceous dinosaurs (Iguanodontidae). We document its occurrence in a basal bird and in one of the forms considered by some to be a feathered dinosaur. These occurrences are 20 million years older than the next oldest occurrence of osteoarthritis.
- Chinese Science Bulletin 57, po chińsku
- Pierwszy zapis tropów dinozaurów z Pekinu, współautorstwa dr Gerarda Gierlińskiego:
Zhang Jianping, Xing Lida, Gierliński, Gerard D., Wu Fadong, Tian Mingzhong & Currie, Philip (2012)
First record of dinosaur trackways in Beijing, China. [in Chinese]
Chinese Science Bulletin (Chinese Version) 57: 144–152
doi: 10.1360/972011-1963
We describe a number of newly discovered dinosaur tracks from the Late Jurassic-Early Cretaceous Tuchengzi Formation, located in the core zone of Yanqing Silicified Wood National Geopark, during field work for the preparation of global geopark application in Yanqing County, Beijing. The preliminary research indicates that these may comprise thyreophoran (cf. Deltapodus isp.), theropod, ornithopod and probably sauropod tracks. The thyreophoran tracks indicate the presence of this family during the Late Jurassic in the Jibei-Liaoxi area. This may be related to the presence of ankylosaurids from the Lower Cretaceous Yixian Formation, in Chaoyang, Liaoning. As they are rare, high-speed theropod tracks reveal aspects of their paleoethology. The dinosaur tracks from Yanqing constitute the first evidence of dinosaurs in Beijing. These also enrich the knowledge on the diversity of dinosaur species in the Tuchengzi Formation, which provides an excellent evolutionary sample to compare with that of the later Jehol Fauna.
http://xinglida.net/pdf/Xing_et%20_al_2 ... 0track.pdf
- Geological Bulletin of China, 2012, 31(1)
- Trop kucającego teropoda z Chin.
Lida Xing, Gerard D. Gierliński, Jerald D. Harris, Julien D.Divay. A Probable Crouching Theropod Dinosaur Trace from the Jurassic-Cretaceous Boundary in Hebei, China. Geological Bulletin of China, 2012, 31(1): 20-25
A probable theropod dinosaur crouching trace and associated tracks
from the Tuchengzi (Houcheng) Formation of Siliang Mountain, Chicheng
County, Hebei Province, China are the largest theropod tracks
currently known from the formation. Although the crouching trace lacks
manus and tail marks, the traces are interpreted as made by a
crouching theropod because they include a left metatarsal impression
and associated ischial, and possibly pubic, callosity traces. This
represents the third known example of an asymmetric crouching position
adopted by a theropod.
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Jak rósł Dysalotosaurus lettowvorbecki:
Hübner TR (2012) Bone Histology in Dysalotosaurus lettowvorbecki (Ornithischia: Iguanodontia) – Variation, Growth, and Implications. PLoS ONE 7(1): e29958. http://dx.plos.org/10.1371/journal.pone.0029958
Hübner TR (2012) Bone Histology in Dysalotosaurus lettowvorbecki (Ornithischia: Iguanodontia) – Variation, Growth, and Implications. PLoS ONE 7(1): e29958. http://dx.plos.org/10.1371/journal.pone.0029958
Tak wiele dinozaurów, tak mało czasu...
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Re: Dinozaury 2012 - nowe informacje
Journal of Vertebrate Paleontology 32 (1)
Burch & Carrano, 2012
An articulated pectoral girdle and forelimb of the abelisaurid theropod Majungasaurus crenatissimus from the Late Cretaceous of Madagascar.
(s. 1-16)
Abelisaurid theropods are common members of Cretaceous Gondwanan faunas and are characterized by a bizarre, highly reduced forelimb.
Unfortunately, forelimb elements are rarely preserved and thus the basic structure of the abelisaurid forelimb remains poorly understood.
Until recently, the Upper Cretaceous Maevarano Formation of northwestern Madagascar has produced numerous exceptional specimens of
the abelisaurid theropod Majungasaurus crenatissimus but comparatively little forelimb material. A recently discovered articulated skeleton
of Majungasaurus preserves a virtually complete pectoral girdle and forelimb, which, along with additional isolated forelimb elements, affords important new insights into the structure of these elements. New specimens of the scapulocoracoid and humerus allow more detailed description of their morphology, and antebrachial and manual elements
are described for the first time. The radius and ulna are approximately one-quarter the length of the humerus and both have expanded proximal and distal articular surfaces relative to their narrow diaphyses. The manus consists of four digits, each composed of a short metacarpal and one (digits I and IV) or two (digits II and III) phalanges. No ossified carpals are present. The proportions of
the brachium and antebrachium are stout, more similar to the condition in Carnotaurus than in Aucasaurus. We reinterpret manual digit
identities in Aucasaurus and Carnotaurus based on new information provided by the manus of Majungasaurus. Overall, the morphology of the
forelimb in Majungasaurus reveals that abelisaurids share an extremely reduced, unique morphology that is dissimilar to the more typical theropod condition seen in other ceratosaurs.
Haluza, Canale, Otero, Pérez & Scanferla, 2012
Changes in vertebral laminae across the cervicodorsal transition of a well-preserved rebbachisaurid (Dinosauria, Sauropoda) from the Cenomanian of Patagonia, Argentina
(s. 219-224)
Fragment zęba teropoda o rozmiarach zbliżonych do T. rex albo nawet większego: Galton PM, Molnar RE. 2011. An unusually large theropod dinosaur tooth from the Kirkwood Formation (Lower Cretaceous) of South Africa. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. http://dx.doi.org/10.1127/0077-7749/2011/0204
Palaios 27(1):35-47. 2012
WATER VAPOR CONDUCTANCE OF THE LOWER CRETACEOUS DINOSAURIAN EGGS FROM SANAGASTA, LA RIOJA, ARGENTINA: PALEOBIOLOGICAL AND PALEOECOLOGICAL IMPLICATIONS FOR SOUTH AMERICAN FAVEOLOOLITHID AND MEGALOOLITHID EGGS
GERALD GRELLET-TINNER, LUCAS ERNESTO FIORELLI, and RODRIGO BRINCALEPE SALVADOR
The water vapor conductance (GH2O) of the neosauropod eggs from the Lower Cretaceous Sanagasta nesting site in La Rioja Province, Argentina, was examined and compared with other Cretaceous Argentinean oological material. The 2900 mgH2O/day·Torr GH2O of the Sanagasta eggshells confirms an extremely moist nesting environment and supports field observations of dug-out nests in a geothermal setting. The observed thinning of the outer eggshell surface during incubation increases gas conductance and concomitantly decreases eggshell mechanical resistance during the late ontogenetic stages, thus facilitating embryonic development and hatching. The Sanagasta and Entre Ríos Province faveoloolithid eggs display the highest and comparable GH2O values and share several morphological and diagenetic characters, indicating comparable nesting strategy in geothermal settings. However, the faveoloolithid Yaminué and La Pampa Province specimens cluster together with lower GH2O values closer to the megaloolithid eggs. The GH2O of the megaloolithid egg Megaloolithus patagonicus was reconsidered and new results are now congruent with other reported megaloolithid GH2O values. Additionally, we hypothesize that Y-shaped pore canals of M. patagonicus, which upper sections reach only the top third or half eggshell thickness and, a wider section in the middle would not compromise the overall egg mechanical resistance like vertical pores connecting directly the outer to the inner eggshell surfaces. Such pore spatial arrangement and geometry would enhance, as the eggshell thins during incubation, a greater GH2O, GO2 and GCO2 and facilitate embryonic development in high moisture nesting contents. Overall, data suggests that neosauropod nesting and brooding behaviors were dependent on elevated moisture nesting environments.
Paleontologicheskii zhurnal No. 1, 2012
Анатомия мозга Amurosaurus riabinini и некоторые особенности
нейробиологии утконосых динозавров
С. В. Савельев, В. Р. Алифанов, Ю. Л. Болотский
Brain Anatomy of Amurosaurus riabinini and Some Neurobiological Peculiarities
of Duckbilled Dinosaurs
S. V. Saveliev, V. R. Alifanov, Yu. L. Bolotsky
p. 77-88
Burch & Carrano, 2012
An articulated pectoral girdle and forelimb of the abelisaurid theropod Majungasaurus crenatissimus from the Late Cretaceous of Madagascar.
(s. 1-16)
Abelisaurid theropods are common members of Cretaceous Gondwanan faunas and are characterized by a bizarre, highly reduced forelimb.
Unfortunately, forelimb elements are rarely preserved and thus the basic structure of the abelisaurid forelimb remains poorly understood.
Until recently, the Upper Cretaceous Maevarano Formation of northwestern Madagascar has produced numerous exceptional specimens of
the abelisaurid theropod Majungasaurus crenatissimus but comparatively little forelimb material. A recently discovered articulated skeleton
of Majungasaurus preserves a virtually complete pectoral girdle and forelimb, which, along with additional isolated forelimb elements, affords important new insights into the structure of these elements. New specimens of the scapulocoracoid and humerus allow more detailed description of their morphology, and antebrachial and manual elements
are described for the first time. The radius and ulna are approximately one-quarter the length of the humerus and both have expanded proximal and distal articular surfaces relative to their narrow diaphyses. The manus consists of four digits, each composed of a short metacarpal and one (digits I and IV) or two (digits II and III) phalanges. No ossified carpals are present. The proportions of
the brachium and antebrachium are stout, more similar to the condition in Carnotaurus than in Aucasaurus. We reinterpret manual digit
identities in Aucasaurus and Carnotaurus based on new information provided by the manus of Majungasaurus. Overall, the morphology of the
forelimb in Majungasaurus reveals that abelisaurids share an extremely reduced, unique morphology that is dissimilar to the more typical theropod condition seen in other ceratosaurs.
Haluza, Canale, Otero, Pérez & Scanferla, 2012
Changes in vertebral laminae across the cervicodorsal transition of a well-preserved rebbachisaurid (Dinosauria, Sauropoda) from the Cenomanian of Patagonia, Argentina
(s. 219-224)
Fragment zęba teropoda o rozmiarach zbliżonych do T. rex albo nawet większego: Galton PM, Molnar RE. 2011. An unusually large theropod dinosaur tooth from the Kirkwood Formation (Lower Cretaceous) of South Africa. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. http://dx.doi.org/10.1127/0077-7749/2011/0204
Palaios 27(1):35-47. 2012
WATER VAPOR CONDUCTANCE OF THE LOWER CRETACEOUS DINOSAURIAN EGGS FROM SANAGASTA, LA RIOJA, ARGENTINA: PALEOBIOLOGICAL AND PALEOECOLOGICAL IMPLICATIONS FOR SOUTH AMERICAN FAVEOLOOLITHID AND MEGALOOLITHID EGGS
GERALD GRELLET-TINNER, LUCAS ERNESTO FIORELLI, and RODRIGO BRINCALEPE SALVADOR
The water vapor conductance (GH2O) of the neosauropod eggs from the Lower Cretaceous Sanagasta nesting site in La Rioja Province, Argentina, was examined and compared with other Cretaceous Argentinean oological material. The 2900 mgH2O/day·Torr GH2O of the Sanagasta eggshells confirms an extremely moist nesting environment and supports field observations of dug-out nests in a geothermal setting. The observed thinning of the outer eggshell surface during incubation increases gas conductance and concomitantly decreases eggshell mechanical resistance during the late ontogenetic stages, thus facilitating embryonic development and hatching. The Sanagasta and Entre Ríos Province faveoloolithid eggs display the highest and comparable GH2O values and share several morphological and diagenetic characters, indicating comparable nesting strategy in geothermal settings. However, the faveoloolithid Yaminué and La Pampa Province specimens cluster together with lower GH2O values closer to the megaloolithid eggs. The GH2O of the megaloolithid egg Megaloolithus patagonicus was reconsidered and new results are now congruent with other reported megaloolithid GH2O values. Additionally, we hypothesize that Y-shaped pore canals of M. patagonicus, which upper sections reach only the top third or half eggshell thickness and, a wider section in the middle would not compromise the overall egg mechanical resistance like vertical pores connecting directly the outer to the inner eggshell surfaces. Such pore spatial arrangement and geometry would enhance, as the eggshell thins during incubation, a greater GH2O, GO2 and GCO2 and facilitate embryonic development in high moisture nesting contents. Overall, data suggests that neosauropod nesting and brooding behaviors were dependent on elevated moisture nesting environments.
Paleontologicheskii zhurnal No. 1, 2012
Анатомия мозга Amurosaurus riabinini и некоторые особенности
нейробиологии утконосых динозавров
С. В. Савельев, В. Р. Алифанов, Ю. Л. Болотский
Brain Anatomy of Amurosaurus riabinini and Some Neurobiological Peculiarities
of Duckbilled Dinosaurs
S. V. Saveliev, V. R. Alifanov, Yu. L. Bolotsky
p. 77-88
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Puszka mózgowa spinoforozaura:
Knoll F, Witmer LM, Ortega F, Ridgely RC, Schwarz-Wings D (2012) The Braincase of the Basal Sauropod Dinosaur Spinophorosaurus and 3D Reconstructions of the Cranial Endocast and Inner Ear. PLoS ONE 7(1): e30060. http://dx.plos.org/10.1371/journal.pone.0030060
Kostne twory na ogonie pachycefalozaurów mogą być skostniałymi mioseptami (ang. myorhabdoid) - jeśli to prawda, byłyby to pierwsze takie struktury znane u czworonogów (choć niehomologiczne z rybimi):
Brown CM, Russell AP (2012) Homology and Architecture of the Caudal Basket of Pachycephalosauria (Dinosauria: Ornithischia): The First Occurrence of Myorhabdoi in Tetrapoda. PLoS ONE 7(1): e30212. http://dx.plos.org/10.1371/journal.pone.0030212
Knoll F, Witmer LM, Ortega F, Ridgely RC, Schwarz-Wings D (2012) The Braincase of the Basal Sauropod Dinosaur Spinophorosaurus and 3D Reconstructions of the Cranial Endocast and Inner Ear. PLoS ONE 7(1): e30060. http://dx.plos.org/10.1371/journal.pone.0030060
Kostne twory na ogonie pachycefalozaurów mogą być skostniałymi mioseptami (ang. myorhabdoid) - jeśli to prawda, byłyby to pierwsze takie struktury znane u czworonogów (choć niehomologiczne z rybimi):
Brown CM, Russell AP (2012) Homology and Architecture of the Caudal Basket of Pachycephalosauria (Dinosauria: Ornithischia): The First Occurrence of Myorhabdoi in Tetrapoda. PLoS ONE 7(1): e30212. http://dx.plos.org/10.1371/journal.pone.0030212
Tak wiele dinozaurów, tak mało czasu...
Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Te struktury u ryb i pachycefalozaurów są homologiczne, za to ich kostnienie u obu grup ma charakter homoplazji.Ag.Ent pisze:Kostne twory na ogonie pachycefalozaurów mogą być skostniałymi mioseptami (ang. myorhabdoid) - jeśli to prawda, byłyby to pierwsze takie struktury znane u czworonogów (choć niehomologiczne z rybimi)
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Oczywiście, źle się wyraziłem.Dawid Mazurek pisze:Te struktury u ryb i pachycefalozaurów są homologiczne, za to ich kostnienie u obu grup ma charakter homoplazji.Ag.Ent pisze:Kostne twory na ogonie pachycefalozaurów mogą być skostniałymi mioseptami (ang. myorhabdoid) - jeśli to prawda, byłyby to pierwsze takie struktury znane u czworonogów (choć niehomologiczne z rybimi)
Dla tych, którzy jeszcze nie słyszeli:
Ezcurra i Agnolín. 2012. An abelisauroid dinosaur from the Middle Jurassic of Laurasia and its implications on theropod palaeobiogeography and evolution. Proceedings of the Geologists' Association. http://dx.doi.org/10.1016/j.pgeola.2011.12.003
Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Redeskrypcja Chuanjiesaurus: http://www.dinosaur.pref.fukui.jp/archi ... 10-001.pdf
Trochę informacji przyda się do opisu Mamenchisaurus, który jak wynika z wstępnej analizy nie jest monofiletyczny w dzisiejszym rozumieniu. Krok w dobrym kierunku, chyba będą kolejne publikacje o mamenchizaurydach.
Bardzo mnie to cieszy MSz
Trochę informacji przyda się do opisu Mamenchisaurus, który jak wynika z wstępnej analizy nie jest monofiletyczny w dzisiejszym rozumieniu. Krok w dobrym kierunku, chyba będą kolejne publikacje o mamenchizaurydach.
Bardzo mnie to cieszy MSz
[Stamp: Apsaravis] [Avatar: P. Weimer, CC BY-NC-SA 2.0]
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Garść newsów:
- Archeopteryks miał czarne pióra
Ryan M. Carney, Jakob Vinther, Matthew D. Shawkey, Liliana D'Alba &
Jörg Ackermann (2012)
New evidence on the colour and nature of the isolated Archaeopteryx feather.
Nature Communications 3 (637)
doi:10.1038/ncomms1642
http://www.nature.com/ncomms/journal/v3 ... s1642.html
Archaeopteryx has been regarded as an icon of evolution ever since its
discovery from the Late Jurassic limestone deposits of Solnhofen,
Germany in 1861. Here we report the first evidence of colour from
Archaeopteryx based on fossilized colour-imparting melanosomes
discovered in this isolated feather specimen. Using a phylogenetically
diverse database of extant bird feathers, statistical analysis of
melanosome morphology predicts that the original colour of this
Archaeopteryx feather was black, with 95% probability. Furthermore,
reexamination of the feather's morphology leads us to interpret it as
an upper major primary covert, contrary to previous interpretations.
Additional findings reveal that the specimen is preserved as an
organosulphur residue, and that barbule microstructure identical to
that of modern bird feathers had evolved as early as the Jurassic. As
in extant birds, the extensive melanization would have provided
structural advantages to the Archaeopteryx wing feather during this
early evolutionary stage of dinosaur flight.
http://www.physorg.com/news/2012-01-win ... light.html
http://news.brown.edu/pressreleases/201 ... haeopteryx - Ciekawie zachowane tropy dinozaurów z Hiszpanii:
Huerta, P., Fernández-Baldor, F. T., Farlow, J. O. and Montero, D. (2012)
Exceptional preservation processes of 3D dinosaur footprint casts in
Costalomo (Lower Cretaceous, Cameros Basin, Spain).
Terra Nova (advance online publication)
doi: 10.1111/j.1365-3121.2011.01047.x
http://onlinelibrary.wiley.com/doi/10.1 ... x/abstract
Theropod dinosaur footprints at the Costalomo tracksite (Pinilla de
los Moros Formation, Upper Hauterivian–Lower Barremian, western
Cameros Basin, Salas de los Infantes, Burgos Province, Spain) show
unusual preservation of a previously undescribed nature. The
footprints occur as casts (positive epireliefs) at the top of a
sandstone bed and preserve exceptional details of the top of the digit
and claw morphology, and of digital interactions with the sediment
during penetration and extraction from the sediment. Footprint
formation and preservation occurred in the following stages: (1) The
dinosaur stepped on a thin (4–8 cm thick) mud layer, its foot sinking
to contact an underlying sand layer (channel fill); (2) voids left in
the cohesive mud after foot withdrawal were later filled with sand;
(3) subsequent deposition, burial and Alpine compression indurated the
muds and the sands of both the footprint casts and the underlying
channel sand layer; and (4) modern erosion exposed the footprint
casts, by removing the mud above the sandstone. - Arktyczne dinozaury z Kanady:
David C. Evans, Matthew J. Vavrek, Dennis R. Braman, Nicolás E.
Campione, T. Alexander Dececchi & Grant D. Zazula (2012)
Vertebrate fossils (Dinosauria) from the Bonnet Plume Formation, Yukon
Territory, Canada.
Canadian Journal of Earth Sciences (advance online publication)
doi: 10.1139/e11-064
http://www.nrcresearchpress.com/doi/abs/10.1139/e11-064
Dinosaurs and other terrestrial vertebrates are poorly documented in
the Mesozoic of the Canadian polar region. Here, we provide a complete
review of the Upper Cretaceous (Maastrichtian) vertebrate fauna of the
Bonnet Plume Formation in the northeastern Yukon Territory, Canada,
which includes the description of the first newly collected dinosaur
bones from this unit in almost half a century. Previously reported
fragmentary dinosaur remains collected in the early 1960’s pertain to
an indeterminate hadrosaurid. New material includes a poorly preserved
forelimb bone and a pedal phalanx. These new remains pertain to at
least one species of non-hadrosaurid ornithischian dinosaur, and the
humerus is tentatively referred to a small-bodied basal ornithopod.
The new vertebrate fossils from the Bonnet Plume Formation provide
further evidence of vertebrates from this unit. However, directed
field surveys in 2008 and 2009 suggest that vertebrate fossils are not
abundant. A review of the known localities of terrestrial Mesozoic
vertebrates from the Canadian Arctic indicate that it had a relatively
diverse community of terrestrial vertebrates, including dinosaurs,
during the Late Cretaceous, but emphasizes our limited knowledge of
the Mesozoic Arctic and considerable potential for future exploration
and discovery. - Elementy pancerza polakanta z Hiszpanii:
J. Miguel Gasulla, Francisco Ortega, Xavier Pereda Suberbiola,
Fernando Escaso, J. Luis Sanz (2011)
DERMAL ARMOUR ELEMENTS OF THE ANKYLOSAUR DINOSAUR POLACANTHUS OWEN,
1865, FROM THE LOWER CRETACEOUS OF MORELLA (CASTELLÓN, SPAIN). (in
Spanish)
Ameghiniana 48(4): 508-519
http://www.ameghiniana.org.ar/index.php ... e/view/276
Abstract
Isolated dermal armour elements of an ankylosaur from the lower Aptian
Arcillas de Morella Formation at Morella (Castellón, Spain) are
described herein. These elements are presacral and caudal spines,
fragments of sacropelvic shield, keeled scutes and keeled ossicles.
The possession of ungrooved presacral spines and a sa-cropelvic shield
composed of irregularly arranged bosses and small tubercles are some
of the features shared with Polacanthus. Thus we tentatively refer
these elements to Polacanthus sp. This assemblage of Polacanthus
dermal armour elements is currently the most important outside
England. Furthermore, the new evidence of this ankylosaur in the
Iberian record corroborates the great similarity between the
Barremian–Aptian dinosaur faunas both the British and Iberian records. - Nowy tytanozaur z nietypowymi łukami hemalnymi z Argentyny
bez abstraktuAlejandro Otero, Juan Ignacio Canale, Alejandro Haluza & Jorge Orlando
Calvo (2011)
NEW TITANOSAUR WITH UNUSUAL HAEMAL ARCHES FROM THE UPPER CRETACEOUS OF NEUQUÉN PROVINCE, ARGENTINA.
Ameghiniana 48(4): 655-661 - Prawdopodobnie tropy dromeozauryda z Ameryki Południowej:
j.w.Sebastián Apesteguía, Silvina de Valais, Giovanni Ríos Cordero & Omar
Medina Ramírez (2011)
NEW ICHNOLOGICAL RECORD FROM THE LATE CAMPANIAN TORO TORO FORMATION AT TORO TORO, POTOSÍ (BOLIVIA): FIRST PROBABLE DROMAEOSAURID TRACKS FROM SOUTH AMERICA.
Ameghiniana 48(4): 662-667 - Ząb pachycefalozaura z Meksyku
http://impreso.milenio.com/node/9098218 - Gniazdowisko massospondyla w Południowej Afryce:
http://www.cbc.ca/news/technology/story ... -site.html - I już całkiem tabloidowo - Jack Horner poślubił 19-letnią studentkę paleontologii z Uniwersytetu w Montanie. Oboje pracują w Museum of the Rockies i wyglądają na szczęśliwych ;)
Można by sparafrazować Agathę Christie - "Wymarzona żona to paleontolog - im mąż starszy tym bardziej się nim interesuje".
Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
(Od teraz) mój idolDino pisze:[*]I już całkiem tabloidowo - Jack Horner poślubił 19-letnią studentkę paleontologii z Uniwersytetu w Montanie. Oboje pracują w Museum of the Rockies i wyglądają na szczęśliwych ;)
Można by sparafrazować Agathę Christie - "Wymarzona żona to paleontolog - im mąż starszy tym bardziej się nim interesuje".[/list]
Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
no cóż mlodsze 'osobniki' zawsze bardziej kręcą..odwrotnie niż w paleontologii
"Somewhere, something incredible is waiting to be known" - C.Sagan
-
- Kredowy tyranozaur
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Pannę młodą to jednak bardziej kręcą skamieniałości ;)skrecu pisze:no cóż mlodsze 'osobniki' zawsze bardziej kręcą..
Tak wiele dinozaurów, tak mało czasu...
Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Zważ Rafale, że na każdą osobę zakręconą z sukcesem młodszym osobnikiem, przypada jedna zakręcona starszym.
- szerman
- Neogeński mastodont
- Posty: 4060
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Ale się zestarzał! Na pierwszy rzut oka przypomina mi Sędziego z komedii "Same Kłopoty":
http://www.filmweb.pl/film/Same+k%C5%82opoty-1991-8204
Na szczęście tylko na pierwszy rzut oka :D
http://www.filmweb.pl/film/Same+k%C5%82opoty-1991-8204
Na szczęście tylko na pierwszy rzut oka :D
"Mastodon sapiens"
Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
a co z nieodwzajemnionymi uczuciami?
"Somewhere, something incredible is waiting to be known" - C.Sagan
Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
No tak, najbardziej komentowanym newsem jest Horner wyrywający dziewiętnastkę. Heh, dobry jest!
proponuję informację na głównej okraszoną soczystym komentarzem. Wzrośnie oglądalność!
Żeby nie było, że stajemy się pudelkiem, to dodam znacznie mniej spektakularny news - stopa Lihenykus w APP (czterech autorów ): http://dx.doi.org/10.4202/app.2011.0127
proponuję informację na głównej okraszoną soczystym komentarzem. Wzrośnie oglądalność!
Żeby nie było, że stajemy się pudelkiem, to dodam znacznie mniej spektakularny news - stopa Lihenykus w APP (czterech autorów ): http://dx.doi.org/10.4202/app.2011.0127
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- Dino
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
I się dziwicie, że co niektóre wydawnictwa zmieniają profil na tabloidowy :D
-
- Kredowy tyranozaur
- Posty: 2300
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- Imię i nazwisko: Tomasz Skawiński
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Dobra, zostawiamy Hornera prawdziwym tabloidom (typu Science i Nature ;)).
A propos najstarszego gniazda masospondyla: jest już właściwa publikacja: http://dx.doi.org/10.1073/pnas.1109385109
A propos najstarszego gniazda masospondyla: jest już właściwa publikacja: http://dx.doi.org/10.1073/pnas.1109385109
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- Moderator
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Mój teżDawid Mazurek pisze:(Od teraz) mój idol
Biologia, UW
Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
poczekaj jeszcze z 40 lat...i zobacz wtedy sam jak TO smakuje
"Somewhere, something incredible is waiting to be known" - C.Sagan
Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Bell PR (2012) Standardized Terminology and Potential Taxonomic Utility for Hadrosaurid Skin Impressions: A Case Study for Saurolophus from Canada and Mongolia. PLoS ONE 7(2): e31295. doi:10.1371/journal.pone.0031295
The characterization of palaeospecies typically relies on hard-tissue anatomy, such as bones or teeth that is more readily fossilized than soft parts. Among dinosaurs, skin impressions are commonly associated with partial and complete hadrosaurid skeletons, and consist of non-imbricating tubercles or scales. Skin impressions from various parts of the body of two species of the hadrosaurine Saurolophus (S. angustirostris from Mongolia and S. osborni from Canada) are described from multiple specimens. These species, recently validated on osteological grounds, can be differentiated based solely on soft-tissue anatomy, namely scale shape and pattern. This study demonstrates for the first time the applicability of soft-tissue (i.e., scale impressions) as a means to differentiate species within the Dinosauria. Differences are most spectacular in the tail, where S. angustirostris is differentiated by the presence of vertical bands of morphologically distinct scales, a grid-like arrangement of circular feature-scales, and tabular scales along the dorsal midline. Preliminary results indicate scale architecture remained consistent throughout ontogeny in S. angustirostris. These results support previous assertions that hadrosaurid scale architecture has a positive phylogenetic signal. As such, future taxonomic descriptions should include, where possible, the standardized description of skin impressions including the position and orientation of these impressions on the body.
The characterization of palaeospecies typically relies on hard-tissue anatomy, such as bones or teeth that is more readily fossilized than soft parts. Among dinosaurs, skin impressions are commonly associated with partial and complete hadrosaurid skeletons, and consist of non-imbricating tubercles or scales. Skin impressions from various parts of the body of two species of the hadrosaurine Saurolophus (S. angustirostris from Mongolia and S. osborni from Canada) are described from multiple specimens. These species, recently validated on osteological grounds, can be differentiated based solely on soft-tissue anatomy, namely scale shape and pattern. This study demonstrates for the first time the applicability of soft-tissue (i.e., scale impressions) as a means to differentiate species within the Dinosauria. Differences are most spectacular in the tail, where S. angustirostris is differentiated by the presence of vertical bands of morphologically distinct scales, a grid-like arrangement of circular feature-scales, and tabular scales along the dorsal midline. Preliminary results indicate scale architecture remained consistent throughout ontogeny in S. angustirostris. These results support previous assertions that hadrosaurid scale architecture has a positive phylogenetic signal. As such, future taxonomic descriptions should include, where possible, the standardized description of skin impressions including the position and orientation of these impressions on the body.
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Super coraz bardziej dinozaurologia wychodzi poza kości. Trzeba uzupełnić opis zaurolofa.
Już od jakiegoś czasu trzeba. Dino zajął go już do poprawy. "coraz" razem. MZ
Już od jakiegoś czasu trzeba. Dino zajął go już do poprawy. "coraz" razem. MZ
Biologia, UW
- Edyta
- Dewoński labiryntodont
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Ventilatory mechanics from maniraptoran theropods to extant birds
Journal of Evolutionary Biology
P. G. Tickle, M. A. Norell and J. R. Codd
Article first published online : 2 Feb 2012
DOI: 10.1111/j.1420-9101.2012.02465.x
Journal of Evolutionary Biology
P. G. Tickle, M. A. Norell and J. R. Codd
Article first published online : 2 Feb 2012
DOI: 10.1111/j.1420-9101.2012.02465.x
Shared behavioural, morphological and physiological characteristics are
indicative of the evolution of extant birds from nonavian maniraptoran
dinosaurs. One such shared character is the presence of uncinate processes and
respiratory structures in extant birds. Recent research has suggested a
respiratory role for these processes found in oviraptorid and dromaeosaurid
dinosaurs. By measuring the geometry of fossil rib cage morphology, we
demonstrate that the mechanical advantage, conferred by uncinate processes,
for movements of the ribs in the oviraptorid theropod dinosaur, Citipati
osmolskae, basal avialan species Zhongjianornis yangi, Confuciusornis sanctus and
the more derived ornithurine Yixianornis grabaui, is of the same magnitude as
found in extant birds. These skeletal characteristics provide further evidence of
a flow-through respiratory system in nonavian theropod dinosaurs and basal
avialans, and indicate that uncinate processes are a key adaptation facilitating
the ventilation of a lung air sac system that diverged earlier than extant birds.
- Dino
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
Kolejne wieści:
- Pióro z Chin datowane na wcześniej niż 161 Ma
Yong-Qing Liu, Hong-Wei Kuang, Xiao-Jun Jiang, Nan Peng, Huan Xu &
Hui-Yi Sun (2012)
Timing of the earliest known feathered dinosaurs and transitional
pterosaurs older than the Jehol Biota.
Palaeogeography, Palaeoclimatology, Palaeoecology (advance online publication)
Yong-Qing Liu, Hong-Wei Kuang, Xiao-Jun Jiang, Nan Peng, Huan Xu &
Hui-Yi Sun (2012)
http://dx.doi.org/10.1016/j.palaeo.2012.01.017
http://www.sciencedirect.com/science/ar ... 00314?v=s5
The Early Cretaceous Jehol Biota in China has produced numerous well
preserved fossils of feathered theropods and early birds. Recent
discoveries of feathered dinosaurs, as well as transitional pterosaurs
and a sexually mature individual of Darwinopterus preserved together
with an egg from the Daohugou Biota of an earlier age than the Jehol
Biota, in northeastern China, have greatly enriched our knowledge of
the transition from dinosaurs to birds and primitive to derived
pterosaurs. The age estimate of fossils or host strata, however, has
proven to be contentious and varies widely from the Middle Jurassic to
the Early Cretaceous. Here, we report a SHRIMP U-Pb zircon date
unambiguously associated with the fossil horizons, and thus, for the
first time, provide an age calibration for the earliest appearance of
feathered dinosaurs and transitional pterosaurs. Date results indicate
that the feathered dinosaurs of China were present more than 161 Ma
ago, unquestionably older than Archaeopteryx in Germany, and are the
earliest known feathered dinosaurs in the world. Furthermore, feathers
appeared in ornithischians before 159 Ma rather than late in the Early
Cretaceous. The known transitional pterosaurs first emerged before 161
Ma. The Daohugou Biota, containing mammals, primitive pterosaurs,
insects and plants, in addition to the feathered dinosaurs, was living
in Inner Mongolia ,western Liaoning and northern Hebei in northeastern
China during the Middle Jurassic. - Maciej pisał wcześniej - nie zauważyłem:[s]Odcisk skóry Saurolophus ukazuje różnice międzygatunkowe:
[/s]Mortimer i Krentz twierdzą, że pracka jest cool ;) Dla mnie też cool bo przyda się do mojego opisuBell, P.R. (2012)
Standardized Terminology and Potential Taxonomic Utility for
Hadrosaurid Skin Impressions: A Case Study for Saurolophus from Canada
and Mongolia.
PLoS ONE 7(2): e31295
doi:10.1371/journal.pone.0031295
http://www.plosone.org/article/info%3Ad ... ne.0031295
The characterization of palaeospecies typically relies on hard-tissue
anatomy, such as bones or teeth that is more readily fossilized than
soft parts. Among dinosaurs, skin impressions are commonly associated
with partial and complete hadrosaurid skeletons, and consist of
non-imbricating tubercles or scales. Skin impressions from various
parts of the body of two species of the hadrosaurine Saurolophus (S.
angustirostris from Mongolia and S. osborni from Canada) are described
from multiple specimens. These species, recently validated on
osteological grounds, can be differentiated based solely on
soft-tissue anatomy, namely scale shape and pattern. This study
demonstrates for the first time the applicability of soft-tissue
(i.e., scale impressions) as a means to differentiate species within
the Dinosauria. Differences are most spectacular in the tail, where S.
angustirostris is differentiated by the presence of vertical bands of
morphologically distinct scales, a grid-like arrangement of circular
feature-scales, and tabular scales along the dorsal midline.
Preliminary results indicate scale architecture remained consistent
throughout ontogeny in S. angustirostris. These results support
previous assertions that hadrosaurid scale architecture has a positive
phylogenetic signal. As such, future taxonomic descriptions should
include, where possible, the standardized description of skin
impressions including the position and orientation of these
impressions on the body. - Z pogranicza: Zmienność ontogenetyczna lokomocji i ewolucja ptasiego lotu; młode ptaki jako model zmian ewolucyjnych teropodów:
Ashley M. Heers & Kenneth P. Dial (2012)
>From extant to extinct: locomotor ontogeny and the evolution of avian flight.
Trends in Ecology and Evolution (advance online publication)
http://dx.doi.org/10.1016/j.tree.2011.12.003
http://www.sciencedirect.com/science/ar ... 4711003570
Evolutionary transformations are recorded by fossils with transitional
morphologies, and are key to understanding the history of life.
Reconstructing these transformations requires interpreting functional
attributes of extinct forms by exploring how similar features function
in extant organisms. However, extinct–extant comparisons are often
difficult, because extant adult forms frequently differ substantially
from fossil material. Here, we illustrate how postnatal developmental
transitions in extant birds can provide rich and novel insights into
evolutionary transformations in theropod dinosaurs. Although juveniles
have not been a focus of extinct–extant comparisons, developing
juveniles in many groups transition through intermediate
morphological, functional and behavioral stages that anatomically and
conceptually parallel evolutionary transformations. Exploring
developmental transitions may thus disclose observable, ecologically
relevant answers to long puzzling evolutionary questions.
Re: [Zbiorczy] Dinozaury 2012 - nowe informacje
raczej datowanie formacji Tiaojishan (=Lanqui), która zawiera najstarsze pierzaste oraz bazalne monofenestraty czy juramaję, co też istotne autorzy uważają faunę Daohugou za część tej formacji, parę opisów muszę zaktualizować pod tym kątem (EDIT: gotowe)Dino pisze:Pióro z Chin datowane na wcześniej niż 161 Ma
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