[Zbiorczy] Dinozaury 2012 - nowe informacje

Czyli co piszczy w paleontologicznej "trawie" :)
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[Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Dino »

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

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Re: Dinozaury 2012 - nowe informacje

Post autor: Dino »

  • 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
EDIT
  • 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.
EDIT
  • 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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Re: Dinozaury 2012 - nowe informacje

Post autor: Ag.Ent »

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
Tak wiele dinozaurów, tak mało czasu...

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Re: Dinozaury 2012 - nowe informacje

Post autor: Dino »

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

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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Ag.Ent »

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
Tak wiele dinozaurów, tak mało czasu...

d_m

Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: d_m »

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)
Te struktury u ryb i pachycefalozaurów homologiczne, za to ich kostnienie u obu grup ma charakter homoplazji.

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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Ag.Ent »

Dawid Mazurek pisze:
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)
Te struktury u ryb i pachycefalozaurów homologiczne, za to ich kostnienie u obu grup ma charakter homoplazji.
Oczywiście, źle się wyraziłem.

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

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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: nazuul »

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
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Dino »

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
    Alejandro 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
    bez abstraktu :|
  • Prawdopodobnie tropy dromeozauryda z Ameryki Południowej:
    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
    j.w.
  • 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".

d_m

Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: d_m »

Dino 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]
(Od teraz) mój idol :mrgreen:

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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: skrecu »

no cóż mlodsze 'osobniki' zawsze bardziej kręcą..odwrotnie niż w paleontologii
"Somewhere, something incredible is waiting to be known" - C.Sagan

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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Ag.Ent »

skrecu pisze:no cóż mlodsze 'osobniki' zawsze bardziej kręcą..
Pannę młodą to jednak bardziej kręcą skamieniałości ;)
Tak wiele dinozaurów, tak mało czasu...

d_m

Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: d_m »

Zważ Rafale, że na każdą osobę zakręconą z sukcesem młodszym osobnikiem, przypada jedna zakręcona starszym.

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Neogeński mastodont
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: szerman »

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
"Mastodon sapiens"

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Jurajski allozaur
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: skrecu »

a co z nieodwzajemnionymi uczuciami?
"Somewhere, something incredible is waiting to be known" - C.Sagan

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nazuul
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: nazuul »

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 :wink: ): http://dx.doi.org/10.4202/app.2011.0127
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Dino
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Dino »

I się dziwicie, że co niektóre wydawnictwa zmieniają profil na tabloidowy :D

Ag.Ent
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Ag.Ent »

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

Utahraptor
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Utahraptor »

Dawid Mazurek pisze:(Od teraz) mój idol :mrgreen:
Mój też :mrgreen:
Biologia, UW

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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: skrecu »

poczekaj jeszcze z 40 lat...i zobacz wtedy sam jak TO smakuje :)
"Somewhere, something incredible is waiting to be known" - C.Sagan

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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: nazuul »

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.
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Utahraptor »

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
Biologia, UW

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Edyta
Dewoński labiryntodont
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Edyta »

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
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.

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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: Dino »

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:
    Bell, 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.
    [/s]Mortimer i Krentz twierdzą, że pracka jest cool ;) Dla mnie też cool bo przyda się do mojego opisu :)
  • 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.

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nazuul
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Re: [Zbiorczy] Dinozaury 2012 - nowe informacje

Post autor: nazuul »

Dino pisze:Pióro z Chin datowane na wcześniej niż 161 Ma
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)
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