Dino pisze:Wnioski/Znaczenie
Ten wzorzec jest zgodny z [hipotezÄ , Ĺźe] Triceratops uĹźywa[Ĺ] swych rogĂłw w walce, a takĹźe kryzy, bÄdÄ cej strukturÄ chroniÄ cÄ dla tego taksonu.
[Zbiorczy] Dinozaury - nowe informacje 2009
[Stamp: Apsaravis] [Avatar: P. Weimer, CC BY-NC-SA 2.0]
Monografia o Neovenator
DziÄki uprzejmoĹci Steve'a Brusatte:
Info z DML
Do pobrania tutaj (niestety miejscami uciÄty skan)Brusatte, S.L., R.B.J. Benson, and S. Hutt. 2008. The osteology of Neovenator salerii (Dinosauria: Theropoda) from the Wealden Group (Barremian) of the Isle of Wight. Monograph of the Palaeontographical Society 162 (631): 1-166.
Neovenator salerii (Dinosauria: Theropoda), from the Early Cretaceous (Barremian) Wessex Formation (Wealden Supergroup) of the Isle of Wight, is the most complete large theropod known from Europe. Here we present a complete description of the holotype and referred specimens, which together comprise approximately 70% of the skeleton. Neovenator possesses numerous autapomorphies and clearly belongs to Allosauroidea, a clade of basal tetanuran theropods that includes Allosaurus, Sinraptor, and the Carcharodontosauridae, a subgroup that contains some of the largest known theropods. Several synapomorphies support Neovenator as the most basal member of Carcharodontosauridae. These are primarily features of the postcranial skeleton, indicating that large body size and the highly apomorphic skull of derived carcharodontosaurids evolved after changes to the axial and appendicular skeleton. This placement suggests that basal carcharodontosaurids were more widespread before becoming restricted to Gondwana later in their evolution.
Info z DML
[Stamp: Apsaravis] [Avatar: P. Weimer, CC BY-NC-SA 2.0]
Pierwszy raz przeczytaĹem na ten temat w gazecie. Nigdy siÄ nad tym nie zastanawiaĹem i myĹlaĹem, Ĺźe zostaĹo to udowodnione bardzo dawno. Jednak kiedy byĹa wzmianka o centrozaurze, zaczÄ
Ĺem siÄ zastanawiac nad tym rodzajem. Z jego budowy jasno wynika, Ĺźe dĹugi rĂłg sĹuĹźyĹ mu do obrony, a kryza do demonstracji godowych. Jest to jednak jedynie moja hipoteza. A wy jak sÄ
dzicie
dinozaury a sagowce i inne nowe dino-pracki
Do pobrania tu:R.J. Butler, P.M. Barrett , P. Kenrick & M.G. Penn. 2009. Testing co-evolutionary hypotheses over geological timescales: interactions between Mesozoic non-avian dinosaurs and cycads. Biological Reviews, 84(1), 73-89
The significance of co-evolution over ecological timescales is well established, yet it remains unclear to what extent co-evolutionary processes contribute to driving large-scale evolutionary and ecological changes over geological timescales. Some of the most intriguing and pervasive long-term co-evolutionary hypotheses relate to proposed interactions between herbivorous non-avian dinosaurs and Mesozoic plants, including cycads. Dinosaurs have been proposed as key dispersers of cycad seeds during the Mesozoic, and temporal variation in cycad diversity and abundance has been linked to dinosaur faunal changes. Here we assess the evidence for proposed hypotheses of trophic and evolutionary interactions between these two groups using diversity analyses, a new database of Cretaceous dinosaur and plant co-occurrence data, and a geographical information system (GIS) as a visualisation tool. Phylogenetic evidence suggests that the origins of several key biological properties of cycads (e.g. toxins, bright-coloured seeds) likely predated the origin of dinosaurs. Direct evidence of dinosaur–cycad interactions is lacking, but evidence from extant ecosystems suggests that dinosaurs may plausibly have acted as seed dispersers for cycads, although it is likely that other vertebrate groups (e.g. birds, early mammals) also played a role. Although the Late Triassic radiations of dinosaurs and cycads appear to have been approximately contemporaneous, few significant changes in dinosaur faunas coincide with the late Early Cretaceous cycad decline. No significant spatiotemporal associations between particular dinosaur groups and cycads can be identified – GIS visualisation reveals disparities between the spatiotemporal distributions of some dinosaur groups (e.g. sauropodomorphs) and cycads that are inconsistent with co-evolutionary hypotheses. The available data provide no unequivocal support for any of the proposed co-evolutionary interactions between cycads and herbivorous dinosaurs – diffuse co-evolutionary scenarios that are proposed to operate over geological timescales are plausible, but such hypotheses need to be firmly grounded on direct evidence of interaction and may be difficult to support given the patchiness of the fossil record.
http://www3.interscience.wiley.com/jour ... 1&SRETRY=0
Do pobrania tu:Watabe, M., Tsogtbaatar, K., and Barsbold, R. 2008. First discovery of a theropod (Dinosauria) from the Upper Jurassic in Mongolia and its stratigraphy. Paleontological Research 12(1):27-36.
A theropod dinosaur is described for the first time from the Upper Jurassic of Mongolia. It is represented by a partial skull from the upper Jurassic Dariv Suite in Dariv, Ikhes Nuur Basin, Gobi-Altai Aimag, western Mongolia, situated relatively close to the Xinjiang Uygur Autonomous Province in the western part of China. From the same beds of the locality, sauropod bones were also abundantly found. Those fossil discoveries suggest that both carnivorous and herbivorous dinosaurs existed in the Jurassic of Mongolia, as in China.
http://www.bioone.org/doi/abs/10.2517/1 ... 2.0.CO%3B2
Krug, A.Z., Jablonski, D., and Valentine, J.W. 2009. Signature of the end-Cretaceous mass extinction in the modern biota. Science 323:767-771. doi: 10.1126/science.1164905.
The long-term effects of mass extinctions on spatial and evolutionary dynamics have been poorly studied. Here we show that the evolutionary consequences of the end-Cretaceous [Cretaceous/Paleogene (K/Pg)] mass extinction persist in present-day biogeography. The geologic ages of genera of living marine bivalves show a significant break from a smooth exponential distribution, corresponding to the K/Pg boundary. The break reflects a permanent increase in origination rates, intermediate between the Mesozoic rate and the post-extinction recovery pulse. This global rate shift is most clearly seen today in tropical bioprovinces and weakens toward the poles. Coupled with the modern geographic distributions of taxa originating before and after the K/Pg boundary, this spatial pattern indicates that tropical origination rates after the K/Pg event have left a permanent mark on the taxonomic and biogeographic structure of the modern biota, despite the complex Cenozoic history of marine environments.
do pobrania:Wedel, M.J. 2009. Evidence for bird-like air sacs in saurischian dinosaurs. Journal of Experimental Zoology 311A. doi: 10.1002/jez.513.
ABSTRACT: Among extant tetrapods, pneumatic postcranial bones are only
present in birds, and they are osteological correlates of the diverticular
lungs and pulmonary air sacs. The presence of postcranial pneumaticity in
sauropod and theropod dinosaurs suggests that some form of air sac system
was also present in the dinosaurian ancestors of birds. In particular,
anatomical and evolutionary patterns of pneumatization in nonavian
saurischian dinosaurs are diagnostic for specific air sacs, including the
cervical, clavicular, and abdominal air sacs. Pneumatic hiatuses are gaps in
the pneumatization of the vertebral column and indicate pneumatization from
multiple sources. A pneumatic hiatus in Haplocanthosaurus provides
additional support for the presence of abdominal air sacs in sauropods. The
origins of postcranial pneumaticity in archosaurs are enigmatic because the
earliest putative traces of pneumaticity are difficult to distinguish from
skeletal imprints of other soft tissues. Nevertheless, several lines of
evidence suggest that air sac-driven lung ventilation was primitive for
Saurischia.
http://sauroposeidon.net/Wedel_2009_air-sacs.pdf
Abstrakty tych i kilku innych, nie dinozaurowych prac moĹźna przeczytaÄ na DML
[Stamp: Apsaravis] [Avatar: P. Weimer, CC BY-NC-SA 2.0]
paleoceĹskie dinozaury
Nie powinienem zbyt wiele zdradzaÄ, ale wkrĂłtce ukaĹźe siÄ artykuĹ dotyczÄ
cy pewnych datowaĹ szczÄ
tkĂłw kostnych (w tym nagromadzenia koĹci jednego osobnika) ewidentnie (takie jest przynajmniej zdanie autorĂłw) nieredepowanych nieptasich dinozaurĂłw z paleocenu kilku lokalizacji.
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znow piaskowce Ojo Alamo w basenie San Juan??
ladowe fauny spinajace K/P sa dobrze rozpoznane wlasciwie tylko w Am Pln, wiec stawiam na Kanade
DalszÄ dyskusjÄ prosĹźÄ prowadziÄ tu:
http://www.dinozaury.com/forum/viewtopic.php?t=2790
Zamykam. nazuul
ladowe fauny spinajace K/P sa dobrze rozpoznane wlasciwie tylko w Am Pln, wiec stawiam na Kanade
DalszÄ dyskusjÄ prosĹźÄ prowadziÄ tu:
http://www.dinozaury.com/forum/viewtopic.php?t=2790
Zamykam. nazuul
"Somewhere, something incredible is waiting to be known" - C.Sagan
UkazaĹa siÄ pracka na ten temat:
http://archosaurmusings.wordpress.com/2 ... evolution/
PDFa nie ma, ale jest to:Dyke, G.J., McGowan, A.J., Nudds, R.L. and Smith, D. 2009. The shape of pterosaur evolution: evidence from the fossil record. Journal of Evolutionary Biology (Online February 2009: DOI: 10.1111/j.1420-9101.2008.01682.x).
Abstract: Although pterosaurs are a well-known lineage of Mesozoic flying reptiles, their fossil record and evolutionary dynamics have never been adequately quantified. On the basis of a comprehensive data set of fossil occurrences correlated with taxon-specific limb measurements, we show that the geological ages of pterosaur specimens closely approximate hypothesized patterns of phylogenetic divergence. Although the fossil record has expanded greatly in recent years, collectorship still approximates a sigmoid curve over time as many more specimens (and thus taxa) still remain undiscovered, yet our data suggest that the pterosaur fossil record is unbiased by sites of exceptional preservation (lagerstätte). This is because as new species are discovered the number of known formations and sites yielding pterosaur fossils has also increased – this would not be expected if the bulk of the record came from just a few exceptional faunas. Pterosaur morphological diversification is, however, strongly age biased: rarefaction analysis shows that peaks of diversity occur in the Late Jurassic and Early Cretaceous correlated with periods of increased limb disparity. In this respect, pterosaurs appear unique amongst flying vertebrates in that their disparity seems to have peaked relatively late in clade history. Comparative analyses also show that there is little evidence that the evolutionary diversification of pterosaurs was in any way constrained by the appearance and radiation of birds.
http://archosaurmusings.wordpress.com/2 ... evolution/
[Stamp: Apsaravis] [Avatar: P. Weimer, CC BY-NC-SA 2.0]
Tropy teropodĂłw z wczesnej jury
Bird-Like Anatomy, Posture, and Behavior Revealed by an Early Jurassic Theropod Dinosaur Resting Trace
ciekawy artykuĹ o tropach siedzÄ cego teropoda, ktĂłre bardzo przypominajÄ ptasie
ciekawy artykuĹ o tropach siedzÄ cego teropoda, ktĂłre bardzo przypominajÄ ptasie
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Z Polski mamy kilka okazĂłw, najczÄĹciej pojedynczych. OczywiĹcie takĹźe tysiÄ
ce zwykĹych tropĂłw. Szkoda, Ĺźe zdjÄcia okazu sÄ
w sĹabej rozdzielczoĹci i sĹabo wykontrastowane. Trzeba siÄ trochÄ wpatrzyÄ, Ĺźeby te tropy dostrzec. W pracy sporo jest cytowaĹ polskich naukowcĂłw, ktĂłrzy wnieĹli ogromny wkĹad w badania ichnoskamieniaĹoĹci dinozaurĂłw.
Biologia, UW
- Tomasz Singer
- Jurajski allozaur
- Posty: 1585
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Turanoceratops pierwszym ceratopsydem z Azji
http://www.springerlink.com/link.asp?id=d50772681p17w04n pisze:Sues, H.-D., and Averianov, A. (2009). "Turanoceratops tardabilis—the first ceratopsid dinosaur from Asia." Naturwissenschaften, doi:10.1007/s00114-009-0518-9.
Abstract Turanoceratops tardabilis from the Upper Cretaceous (Turonian) Bissekty Formation of Dzharakuduk, Uzbekistan, represents the first definite ceratopsid dinosaur recorded from Asia. Reexamination of the original and study of newly collected material indicate that Turanoceratops has well-developed supraorbital horns and apparently lacks a nasal horn. Turanoceratops is more derived than the more or less coeval Zuniceratops from the Moreno Hill Formation of New Mexico in the presence of double-rooted teeth and of two or three teeth in each vertical dental file.
[Stamp: Apsaravis] [Avatar: P. Weimer, CC BY-NC-SA 2.0]
- Dino
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Re: Turanoceratops pierwszym ceratopsydem z Azji
Sues, H.-D., and Averianov, A. (2009). "Turanoceratops tardabilis—the first ceratopsid dinosaur from Asia." Naturwissenschaften, doi:10.1007/s00114-009-0518-9.
Turanoceratops tardabilis z gĂłrnej kredy (turon) formacji Bissekty z Dzharakuduk w Uzbekistanie jest pierwszym definitywnym ceratopsydem z Azji. Ponowne zbadanie oryginalnych i nowych materiaĹĂłw wskazuje na obecnoĹÄ u turanoceratopsa dobrze rozbudowanych rogĂłw nadoczodoĹowych i prawdopodobnego braku rogu nosowego. Turanoceratops jest bardziej zaawansowany niĹź bardziej lub mniej wspĂłĹczesny mu Zuniceratopsz formacji Moreno Hill z Nowego Meksyku w obecnoĹci zÄbĂłw o podwĂłjnym korzeniu i dwĂłch lub trzech zÄbĂłw w kaĹźdym pionowym rzÄdzie zÄbĂłw.
Ostatnio zmieniony 1 kwietnia 2009, o 19:47 przez Dino, łącznie zmieniany 1 raz.
Pedal function in deinonychosaurs
Senter, P. 2009. Pedal function in deinonychosaurs (Dinosauria: Theropoda): a comparative study. Bull. Gunma Mus. Natu. Hist. 13: 1-14.Members of the Cretaceous theropod clade Deinonychosauria have a highly modified second toe with an enlarged, recurved ungual. Here I present the first comparative study of pedal function in deinonychosaurs and other theropods to test hypotheses of function for this toe. I manually manipulated bones and casts to determine pedal range of motion in the non-deinonychosaurian theropods Dilophosaurus, Allosaurus, Mononykus, and Chirostenotes, and the deinonychosaurs Troodon, Neuquenraptor,
Rahonavis, Bambiraptor, Deinonychus, and Dromaeosaurus. I also used movies of walking bird feet for comparison. The results of the study show that: 1. contrary to previous suggestions, the distodorsal eminence of pedal phalanx II-1 of deinonychosaurs is not correlated with greater hyperextensibility of phalanx II-2 than in other theropods, 2. the proximoplantar process of phalanx II-2 of deinonychosaurs limits flexion, as previously suggested, 3. movement of the second toe is sub-orthal in dromaeosaurids, the toe remains adducted, angled toward the animal’s midline, through hyperextension and flexion in Troodon, and in other theropods the second and fourth toes diverge during hyperextension and converge during flexion, 4. pedal phalanx I-1 is immobile in Chirostenotes and the examined deinonychosaurs but has a wide range of motion in other theropods, 5. contrary to a previous suggestion, the hallux of Rahonavis was not retroverted, 6. range of motion in the second toe is consistent with opening tough insect nests in dromaeosaurids but not Troodon, 7. the deinonychosaurian second toe was hyperextended, not flexed, during locomotion.
przebieg ontogenezy u Lesothosaurus
Knoll, F., Padian, K., and de Ricqles, A. 2009. Ontogenetic change and adult
body size of the early ornithischian dinosaur Lesothosaurus diagnosticus:
Implications for basal ornithischian taxonomy. Gondwana Research. doi:
10.1016/j.gr.2009.03.010.
ABSTRACT: Questions about the taxonomic status, diversity, and pace of
evolution of basal ornithischian dinosaurs persist in part because some
historically important taxa have been based on incomplete material of
uncertain ontogenetic status. We examined the morphology of critical
"fabrosaurid" specimens and analyzed the bone tissues of small and large
individuals. We conclude that the case for the existence of a
non-heterodontosaurid ornithischian distinct from Lesothosaurus diagnosticus
in the upper Elliot Formation of southern Africa is not conclusive and we
suggest that this species and Stormbergia dangershoeki may actually
represent ontogenetic stages of one taxon that reached maturity in
approximately four years.
body size of the early ornithischian dinosaur Lesothosaurus diagnosticus:
Implications for basal ornithischian taxonomy. Gondwana Research. doi:
10.1016/j.gr.2009.03.010.
ABSTRACT: Questions about the taxonomic status, diversity, and pace of
evolution of basal ornithischian dinosaurs persist in part because some
historically important taxa have been based on incomplete material of
uncertain ontogenetic status. We examined the morphology of critical
"fabrosaurid" specimens and analyzed the bone tissues of small and large
individuals. We conclude that the case for the existence of a
non-heterodontosaurid ornithischian distinct from Lesothosaurus diagnosticus
in the upper Elliot Formation of southern Africa is not conclusive and we
suggest that this species and Stormbergia dangershoeki may actually
represent ontogenetic stages of one taxon that reached maturity in
approximately four years.
późnojurajski welociraptoryn z Niemiec
Na razie tylko abstrakt: http://www.app.pan.pl/article/item/fc54-02.html Kilka zÄ
bkĂłw... ale istotnych, bo to najstarsze tego typu wystÄ
pienie, co ma oczywiĹcie ciekawe implikacje dla dyskusji o poczÄ
tkach ptakĂłw.
Alwarezauryd z kampanu-mastrychtu z Argentyny
PatrzÄ c na czas (Ĺrodkowy kampan-wczesny mastrycht, ok. 76-68 Ma) i miejsce, to zapewne nie jest Ĺźaden z opisanych dotÄ d gatunkĂłw. CaĹa pracka w formacje PDF tu, po hiszpaĹsku.SALGADO, Leonardo; CORIA, Rodolfo A; ARCUCCI, Andrea B and CHIAPPE, Luis M. Restos de Alvarezsauridae (Theropoda, Coelurosauria) en la FormaciĂłn Alien (Campaniano-Maastrichtiano), en Salitral Ojo de Agua, Provincia de RĂo Negro, Argentina. AndGeo [online]. 2009, v. 36, n. 1 [cited 2009-04-24], pp. 67-80. Available from: < http://www.scielo.cl/scielo.php?script= ... en&nrm=iso >. ISSN 0718-7106.
TytuĹ po angielsku: "Remains of Alvarezsauridae (Theropoda, Coelurosauria) in the Alien Formation (Campanian-Maastrichthian), in Salitral Ojo de Agua, RĂo Negro Province, Argentina."
ABSTRACT. We present new remains from the Campanian-Maastrichtian beds of the Alien Formation, in Salitral Ojo de Agua (RĂo Negro, Argentina), which are assignable to Alvarezsauridae indet. This clade of small coelurosaurian theropods is known from strata of similar age in Mongolia, and from older sediments (Turonian and Coniacian in age) in Argentina. Thus, the material presented here extends the temporal record of the alvarezsaurids from the Southern Hemisphere up to the Latest Cretaceous. The fossil bones reported were associated to eggshells of the oofamily Elongatoolithidae, which are actually attributed to Theropoda.
PoniewaĹź juĹź kilka razy spotkaĹem siÄ na Dinozaury.com! z twierdzeniem, Ĺźe Turanoceratops to nowy dinozaur, chciaĹbym poinformowaÄ, Ĺźe to rodzaj opisany i nazwany w 1989 roku przez Nessova i innych. Teraz opublikowano jedynie informacje o nowych szczÄ
tkach oraz wykazano, Ĺźe to nie nomen dubium, lecz waĹźny takson ktĂłry w dodatku jest (jak juz wczesniej przypuszczano) ceratopsydem (Ceratopidae) - pierwszym spoza Ameryki PĂłĹnocnej.
Dotyczy to takĹźe "Podsumowania kwietnia" na gĹĂłwnej.
Dotyczy to takĹźe "Podsumowania kwietnia" na gĹĂłwnej.
ZwĹaszcza, Ĺźe opis turanoceratopsa pojawiĹ siÄ na forum juĹź pod koniec 2006 roku, wiÄc nie mĂłgĹby byÄ opisany dopiero w tym roku ;) - TomekPojawiĹy siÄ rĂłwnieĹź opisy siedmiu nowych rodzajĂłw i gatunkĂłw dinozaurĂłw (trzy zauropodomorfy, dwa ceratopsy i dwa teropody).
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- Timi
- Sylurski akantod
- Posty: 177
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- Imię i nazwisko: Tomasz Rutkowski
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Naukowcy zdobyli krew i komĂłrki dinozaura
Paleontolog Mary Schweitzer z Uniwersytetu PĂłĹnocnej Karoliny twierdzi, Ĺźe odkryĹa w koĹci dinozaura elementy przypominajÄ
ce krew i komĂłrki – informuje serwis worldnetdaily.com.
Schweitzer juĹź kilka lat wczeĹniej ogĹosiĹa, Ĺźe udaĹo jej siÄ wyizolowaÄ elementy tkanki z koĹci tyranozaura. Podczas badaĹ koĹÄ ta zostaĹa jednak zniszczona, tak wiec paleontolog nie byĹa w stanie udowodniÄ swych twierdzeĹ.
Teraz zespóŠbadawczy Schweitzer przeprowadziĹa badania koĹci hadrozaura, zachowanej w piaskowcu. Wbrew wczeĹniejszym teoriom naukowym, okazuje siÄ, Ĺźe elementy tkanki mogÄ przetrwaÄ nawet miliony lat.
ĹšrĂłdĹo: http://wiadomosci.onet.pl/1963215,16,na ... ,item.html
Schweitzer juĹź kilka lat wczeĹniej ogĹosiĹa, Ĺźe udaĹo jej siÄ wyizolowaÄ elementy tkanki z koĹci tyranozaura. Podczas badaĹ koĹÄ ta zostaĹa jednak zniszczona, tak wiec paleontolog nie byĹa w stanie udowodniÄ swych twierdzeĹ.
Teraz zespóŠbadawczy Schweitzer przeprowadziĹa badania koĹci hadrozaura, zachowanej w piaskowcu. Wbrew wczeĹniejszym teoriom naukowym, okazuje siÄ, Ĺźe elementy tkanki mogÄ przetrwaÄ nawet miliony lat.
ĹšrĂłdĹo: http://wiadomosci.onet.pl/1963215,16,na ... ,item.html
http://www.stellar-pictures.pl
http://www.tomaszrutkowski.pl
http://pl.youtube.com/watch?v=43unDWTfkds SAVE OUR RAINFORESTS
"Kiedy wycięte zostanie ostatnie drzewo, ostatnia rzeka zostanie zatruta i zginie ostatnia ryba, odkryjemy, że nie można jeść pieniędzy." Poznaj całą prawdę... http://www.timiworld.fora.pl
http://www.tomaszrutkowski.pl
http://pl.youtube.com/watch?v=43unDWTfkds SAVE OUR RAINFORESTS
"Kiedy wycięte zostanie ostatnie drzewo, ostatnia rzeka zostanie zatruta i zginie ostatnia ryba, odkryjemy, że nie można jeść pieniędzy." Poznaj całą prawdę... http://www.timiworld.fora.pl