[Zbiorczy] Dinozaury 2011 - nowe informacje

[d_m]

filogeneza diplodokoidów:

Diplodocoidea includes some of the first well-known sauropod dinosaurs, including such late 19th century and early 20th century discoveries as Apatosaurus, Diplodocus, and Dicraeosaurus. As a consequence of their long history of study, the basic set of suprageneric diplodocoid interrelationships is well resolved, and the diagnostic features of each genus are well established. However, intergeneric relationships are less resolved, including the relationships of putatively basal taxa like Amphicoelias and Haplocanthosaurus, the flagellicaudatan Suuwassea, and the highly specialized rebbachisaurids. For the rebbachisaurids, this uncertainty is coupled with a recent surge in the discovery of new taxa. Comparative cladistic methods demonstrate that character and taxon sampling need to be improved before greater phylogenetic resolution can be expected. Here, I present a new phylogenetic analysis that resolves many of the outstanding questions regarding the relationships within Diplodocoidea and examines palaeobiogeographical trends within the group. Suuwassea is recovered as a basal dicraeosaurid (the only Laurasian member of the group), and two distinct clades of rebbachisaurids are identified: a group closely allied with Nigersaurus and a clade associated with Limaysaurus. Amphicoelias, Amazonsaurus, and Haplocanthosaurus are provisionally placed as successively less-derived taxa at the base of Diplodocoidea. A North American origin for Diplodocoidea and Flagellicaudata is hypothesized based on the geographical and temporal distribution of those taxa. Rebbachisaurid taxa demonstrate a South American/African vicariance pattern, but the timing of the event pre-dates the proposed final rifting of those continents by c. 40 million years; the meaning of this discrepancy is uncertain.

http://onlinelibrary.wiley.com/doi/10.1 ... x/abstract

[Robert Bronowicz]

New Materials of Masiakasaurus knopfleri Sampson, Carrano, and Forster, 2001, and Implications for the Morphology of the Noasauridae (Theropoda: Ceratosauria)
Matthew T. Carrano, Mark A. Loewen, and Joseph J. W. Sertich
viii + 53 pages
2011 (Date of Issue: 18 January 2011)
Number 95, Smithsonian Contributions to Paleobiology

do ściągnięcia za darmo TU

[Ag.Ent]

Torozaur to jednak nie triceratops? Andrew Farke tak twierdzi I że również Nedoceratops to prawdopodobnie jednak osobny takson.

Farke AA (2011) Anatomy and Taxonomic Status of the Chasmosaurine Ceratopsid Nedoceratops hatcheri from the Upper Cretaceous Lance Formation of Wyoming, U.S.A. PLoS ONE 6(1): e16196. doi:10.1371/journal.pone.0016196

[nazuul]

Interesujące. O liczbie episquamosals i epiparietals była mowa na SVP, tylko sporne pewnie długo pozostanie, czy to uzasadnia odrębność gatunkową. To, co napisał Farke, jakoś mnie nie przekonuje (Agujaceratops).
Konsensus w sprawie torozaur/triceratops pewnie jeszcze długo nie będzie osiągnięty. Podobnie jak sprawa Nedoceratops - patrząc na diagnozę, dla wielu to będzie za mało.

PS połączyłem wątki - myślę, że jeden dość długi dino-temat jest lepszy niż mnóstwo krótkich tematów na i tak długim forum.


EDIT

Thescelosaurus bez serca - dosłownie:

Timothy P. Cleland, Michael K. Stoskopf and Mary H. Schweitzer (2011) "Histological, chemical, and morphological reexamination of the “heart” of a small Late Cretaceous Thescelosaurus" Naturwissenschaften, DOI: 10.1007/s00114-010-0760-1

A three-dimensional, iron-cemented structure found in the anterior thoracic cavity of articulated Thescelosaurus skeletal remains was hypothesized to be the fossilized remains of the animal’s four-chambered heart. This was important because the finding could be interpreted to support a hypothesis that non-avian dinosaurs were endothermic. Mammals and birds, the only extant organisms with four-chambered hearts and single aortae, are endotherms. The hypothesis that this Thescelosaurus has a preserved heart was controversial, and therefore, we reexamined it using higher-resolution computed tomography, paleohistological examination, X-ray diffraction analysis, X-ray photoelectron spectroscopy, and scanning electron microscopy. This suite of analyses allows for detailed morphological and chemical examination beyond what was provided in the original work. Neither the more detailed examination of the gross morphology and orientation of the thoracic “heart” nor the microstructural studies supported the hypothesis that the structure was a heart. The more advanced computed tomography showed the same three areas of low density as the earlier studies with no evidence of additional low-density areas as might be expected from examinations of an ex situ ostrich heart. Microstructural examination of a fragment taken from the “heart” was consistent with cemented sand grains, and no chemical signal consistent with a biological origin was detected. However, small patches of cell-like microstructures were preserved in the sandstone matrix of the thoracic structure. A possible biological origin for these microstructures is the focus of ongoing investigation.

EDIT

Zhuchengosaurus maximus => Shantungosaurus giganteus (największy ptasiomiedniczny, 16,6 m dł.)

Ji, Y., Wang, X., Liu, Y. & Ji, Q. (2011) "Systematics, Behavior and Living Environment of Shantungosaurus Giganteus (Dinosauria: Hadrosauridae)" Acta Geologica Sinica, 85(1), 58–65. DOI: 10.1111/j.1755-6724.2011.00378.x

[hanys]

Nowe informacje na temat Alamosaurus

The first giant titanosaurian sauropod from the Upper Cretaceous of North America
Denver W. Fowler and Robert M. Sullivan
Acta Palaeontologica Polonica in press
available online 07 Feb 2011 doi:10.4202/app.2010.0105

http://www.app.pan.pl/article/item/app20100105.html

EDIT

pozycja przy życiowa Staurikosaurus
Recovering missing data: estimating position and size of caudal vertebrae in Staurikosaurus pricei Colbert, 1970

[Ag.Ent]

W górnych warstwach Hell Creek tyranozaury są równie pospolite jak edmontozaury, a w dolnej 1/3 formacji - niemal dwukrotnie pospolitsze.

Horner JR, Goodwin MB, Myhrvold N (2011) Dinosaur Census Reveals Abundant Tyrannosaurus and Rare Ontogenetic Stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA. PLoS ONE 6(2): e16574. doi:10.1371/journal.pone.0016574.

EDIT

Mallison H. The real lectotype of Kentrosaurus aethiopicus Hennig, 1915. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen; http://dx.doi.org/10.1127/0077-7749/2011/0114

No i artykuł relewantny np. dla niedawnej dyskusji związanej z Linhenykus:
Koji Tamura, Naoki Nomura, Ryohei Seki, Sayuri Yonei-Tamura, Hitoshi Yokoyama. Embryological evidence identifies wing digits in birds as digits 1, 2, and 3. Science; http://dx.doi.org/10.1126/science.1198229

EDIT 2

Wang et al.: The postcranial skeleton of the iguanodontian ornithopod Jinzhousaurus yangi from the Lower Cretaceous Yixian Formation of western Liaoning, China. Earth and Environmental Science Transactions of the Royal Society of Edinburgh; http://dx.doi.org/10.1017/S1755691010009266

Prieto-Marquez: Revised diagnoses of Hadrosaurus foulkii Leidy, 1858 (the type genus and species of Hadrosauridae Cope, 1869) and Claosaurus agilis Marsh, 1872 (Dinosauria: Ornithopoda) from the Late Cretaceous of North America. Zootaxa; http://mapress.com/zootaxa/2011/f/z02765p068f.pdf

Mudroch et al. Didactyl tracks of paravian theropods (Maniraptora) from the ?Middle Jurassic of Africa. PLoS ONE 6(2): e14642. doi:10.1371/journal.pone.0014642

EDIT 3

Arbour, Burns, Currie. 2011. A review of pelvic shield morphology in ankylosaurs (Dinosauria: Ornithischia). Journal of Paleontology 85 (2): 298-302. http://www.bioone.org/doi/abs/10.1666/10-071.1

EDIT 4

Mannion PD, Calvo JO. 2011. Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian–early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics. Zoological Journal of the Linnean Society. http://doi.wiley.com/10.1111/j.1096-3642.2011.00699.x

I, co prawda nie 2011, ale wcześniej chyba mało kto zauważył:

Galton PM, Kermack D. 2010. The anatomy of Pantydraco caducus, a very basal sauropodomorph dinosaur from the Rhaetian (Upper Triassic) of South Wales, UK. Revue de Paléobiologie, Genève 29 (2) : 341-404. http://www.ville-ge.ch/mhng/paleo/paleo ... 9_2_04.pdf

EDIT 5

Yates AM, Wedel MJ, Bonnan MF. 2011. The early evolution of postcranial skeletal pneumaticity in sauropodomorph dinosaurs. Acta Palaeontologica Polonica. http://dx.doi.org/10.4202/app.2010.0075

EDIT 6

Wiele ciekawych artykułów (nie tylko o dinozaurach) w nowym numerze Anais da Academia Brasileira de Ciências, m.in. Unenlagiinae (-idae) jako przedstawiciele Avialae, a nie Dromaeosauridae. http://www.scielo.br/scielo.php?script= ... en&nrm=iso

[Tomasz Singer]

Już w zeszłym tygodniu pojawiło się na DML. Wczoraj w radiu ktoś przekręcił, że to jakiś przodek ptaków.
http://news.discovery.com/dinosaurs/ant ... 10218.html
Kolejny wyczekiwany. W tym gronie jest jeszcze : ornitopod z późnej kredy, tyrannozauropodobny teropod z późnej kredy i dwa (jeżeli ten wspominany tu to też nowy) wczesne zauropody z wczesnej jury.

[Ag.Ent]

Eddy DR, Clarke JA (2011) New Information on the Cranial Anatomy of Acrocanthosaurus atokensis and Its Implications for the Phylogeny of Allosauroidea (Dinosauria: Theropoda). PLoS ONE 6(3): e17932. http://dx.plos.org/10.1371/journal.pone.0017932

EDIT

Ruxton, Wilkinson. The energetics of low browsing in sauropods. Biology Letters. http://dx.doi.org/10.1098/rsbl.2011.0116

Przy okazji - nie o dinozaurach, ale ciekawe: Edwards et al. Infrared mapping resolves soft tissue preservation in 50 million year-old reptile skin. Proc R Soc B. http://dx.doi.org/10.1098/rspb.2011.0135


EDIT [dopisałem nanotyrana. MZ]

The Cleveland tyrannosaur skull (Nanotyrannus or Tyrannosaurus): new findings based on ct scanning, with special reference to the braincase. Witmer. L.M. & Ridgely, R.C. Kirtlandia 37: 61-81.

The Cleveland Museum of Natural History’s skull of a small tyrannosaurid theropod dinosaur (CMNH 7541) collected from the Hell Creek Formation has sparked controversy, with competing hypotheses suggesting that it represents a separate taxon of dwarf tyrannosaurid (Nanotyrannus lancensis), a juvenile specimen of Tyrannosaurus rex (the only other acknowledged Hell Creek tyrannosaurid), or a compromise position (a juvenile Nanotyrannus). Beyond this controversy, CMNH 7541 holds importance because of the anatomical information that such a well preserved skull can provide, and it is in this context that we have sought to probe the structure of the braincase region (e.g., pneumatic sinuses, cranial nerve foramina), as well as other regions of the skull.
We subjected the skull to computed x-ray tomography (CT scanning), followed by computer analysis and 3D visualization. The braincase and a number of other bones (e.g., vomer, quadrate, quadratojugal, palatine, mandible) were digitally "extracted" from the CT datasets. Although the new findings strongly confirm the long-held view that CMNH 7541 pertains to a tyrannosaurid, the mosaic of characters it presents makes finer taxonomic assignment difficult. For example, some characters support affinities with T. rex, yet other characters argue for a much more basal position.
The key question that awaits resolution is whether the differences observed can be attributed to juvenility, and such resolution will require information from new, as yet unpublished specimens. Nevertheless, some of the differences seen in CMNH 7541 (e.g., the pattern of pneumatic foramina in the basicranium) are highly divergent and are harder to attribute to ontogeny. Among other findings, we report here thin, laminar structures within the main nasal airway that are interpretable as being respiratory turbinates, which have potential implications for metabolic physiology.

EDIT 2

Znowu diplodokoidy według Johna Witlocka:
Whitlock JA (2011) Inferences of Diplodocoid (Sauropoda: Dinosauria) Feeding Behavior from Snout Shape and Microwear Analyses. PLoS ONE 6(4): e18304. http://dx.plos.org/10.1371/journal.pone.0018304

EDIT 3

Lloyd GT. 2011. A refined modelling approach to assess the influence of sampling on palaeobiodiversity curves: new support for declining Cretaceous dinosaur richness. Biology Letters. http://dx.doi.org/10.1098/rsbl.2011.0210

[nazuul]

Schmitz, L. & R. Motani (2011) "Nocturnality in dinosaurs inferred from scleral ring and orbit morphology" Science, DOI: 10.1126/science.1200043

Variation in daily activity patterns facilitates temporal partitioning of habitat and resources among species. Knowledge of temporal niche partitioning in paleobiological systems has been limited by the difficulty of obtaining reliable information about activity patterns from fossils. On the basis of an analysis of scleral ring and orbit morphology in 33 archosaurs, including dinosaurs and pterosaurs, we show that the eyes of Mesozoic archosaurs were adapted to all major types of diel activity (that is, nocturnal, diurnal, and cathemeral) and provide concrete evidence of temporal niche partitioning in the Mesozoic. Similar to extant amniotes, flyers were predominantly diurnal; terrestrial predators, at least partially, nocturnal; and large herbivores, cathemeral. These similarities suggest that ecology drives the evolution of diel activity patterns.

http://blogs.discovermagazine.com/notro ... -by-night/

[Ag.Ent]

Baryonyx z Portugalii i status taksonomiczny Suchosaurus:

Mateus et al. 2011. A new specimen of the theropod dinosaur Baryonyx from the early Cretaceous of Portugal and taxonomic validity of Suchosaurus. Zootaxa 2827: 54-68. http://mapress.com/zootaxa/2011/f/z02827p068f.pdf

[d_m]

http://www.app.pan.pl/article/item/app20100125.html

[Ag.Ent]

Czaszka juwenilnego tarbozaura w nowym JVP. Co ciekawe, z identyczną liczbą zębów w kościach szczękowej i zębowej jak u dorosłych osobników.
Poprawiłem linka. MSz

Tsuihiji et al. 2011. Cranial osteology of a juvenile specimen of Tarbosaurus bataar (Theropoda, Tyrannosauridae) from the Nemegt Formation (Upper Cretaceous) of Bugin Tsav, Mongolia. JVP. http://dx.doi.org/10.1080/02724634.2011.557116

PS Materiał z WitmerLab + link do darmowego PDF-a: http://www.oucom.ohiou.edu/dbms-witmer/ ... _skull.htm

[nazuul]

Nowe informacje o:
Barsboldia: http://dx.doi.org/10.1666/10-106.1
Bactrosaurus: http://dx.doi.org/10.1111/j.1475-4983.2011.01053.x
Kentrosaurus: http://dx.doi.org/10.1080/02724634.2011.557112

Przy okazji nowy fajny bauruzuchid - Campinasuchus (świetna rekonstrukcja na s. 34): http://www.mapress.com/zootaxa/2011/f/zt02871p042.pdf
http://pl.wikipedia.org/wiki/Campinasuchus

[Ag.Ent]

Przy okazji nowy fajny bauruzuchid - Campinasuchus (świetna rekonstrukcja na s. 34)

Bauruzuchidy mają szczęście do dobrych rekonstrukcji (pamiętam też świetną ilustrację Baurusuchus salgadoensis).

Do rzeczy:
Arbour VM, Currie PJ. 2011. Tail and pelvis pathologies of ankylosaurian dinosaurs. Historical Biology. http://dx.doi.org/10.1080/08912963.2011.563849

Norman DB, Crompton AW, Butler RJ, Porro LB, Charig AJ. 2011. The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships. Zoological Journal of the Linnean Society. http://doi.wiley.com/10.1111/j.1096-3642.2011.00697.x

Brusatte SL, Benson RBJ, Norell MA. 2011. The anatomy of Dryptosaurus aquilunguis (Dinosauria: Theropoda) and a review of its tyrannosauroid affinities. American Museum Novitates 3717: 1-53. http://dx.doi.org/10.1206/3717.2 (na serwerze AMNH powinno być pod tym linkiem: http://digitallibrary.amnh.org/dspace/handle/2246/6117 [kiedy piszę te słowa, link jeszcze nie działa]).

[polonozuch]

William Hammer of Augustana College found the new creature -- a four- to five-foot ornithischian

Five-foot - pięć stóp
Przecież nie ma takiego dinozaura z pięcioma nogami.

[d_m]

http://pl.wikipedia.org/wiki/Stopa_angielska ;)

[Tomasz Singer]

Five-foot - pięć stóp
Przecież nie ma takiego dinozaura z pięcioma nogami.

Jakiś skrót myślowy, chodzi o długość w miarach anglosaskich.
Czyli pomiędzy 1,2 a 1,5 m długości.

[Ag.Ent]

Kolejne informacje dotyczące peptydów z kości dinozaurów:
San Antonio JD, Schweitzer MH, Jensen ST, Kalluri R, Buckley M, et al. (2011) Dinosaur Peptides Suggest Mechanisms of Protein Survival. PLoS ONE 6(6): e20381. http://dx.plos.org/10.1371/journal.pone.0020381

Na marginesie:
Arenysuchus gascabadiolorum - mastrychcki przedstawiciel Crocodyloidea; Puértolas E, Canudo JI, Cruzado-Caballero P (2011) A New Crocodylian from the Late Maastrichtian of Spain: Implications for the Initial Radiation of Crocodyloids. PLoS ONE 6(6): e20011. http://dx.plos.org/10.1371/journal.pone.0020011

Foth C. 2011. On the identification of feather structures in stem-line representatives of birds: evidence from fossils and actuopalaeontology. Paläontologische Zeitschrift; http://dx.doi.org/10.1007/s12542-011-0111-3

[polonozuch]

Aż do tego momentu, nie wiedziałem po co były te kości w oczodołach. Teraz wiem, że były związane z trybem życia dinozaura lub pterozaura (nocnym lub dziennym).

[szerman]

http://www.huffingtonpost.com/2011/06/1 ... 76723.html
http://www.azadnegar.com/article/smalle ... ever-found
http://dinogoss.blogspot.com/2011/05/as ... toran.html

[nazuul]

A gdzie tam. To jest informacja sprzed paru miesięcy. Bardzo możliwe, że chodzi o ptaka, więc nie wiem po co tyle szumu. Ogólnie nic ciekawego (pewnie dlatego wcześniej na forum nikt nie dał). Tych dwóch pierwszych linków nie czytajcie bo bzdury piszą. Najmniejszym nieptasim dinkiem jest wciąż Parvicursor
http://dx.doi.org/doi:10.1016/j.cretres.2011.03.001

[d_m]

http://news.sciencemag.org/sciencenow/2 ... easts.html

[polonozuch]

Teraz wiadomo, że chociaż część zauropodów były stałocieplne (ciepłokrwiste).

[d_m]

Ciepłokrwistość nie zawsze oznacza stałocieplność, nie zawsze też endotermię.

[Bocianowa]

Tu jest nieco dłuższy artykuł na ten sam temat ;)

http://www.sciencedaily.com/releases/20 ... 141312.htm