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Tytuł:
A new oviraptorosaur [Dinosauria, Theropoda] from Mongolia: the first dinosaur with a pygostyle
Nowy owiraptorozaur [Dinosauria, Theropoda] z Mongolii: pierwszy dinozaur z pygostylem
Autorzy:
Barsbold, R
Osmolska, H
Watabe, M
Currie, P J
Tsogtbaatar, K
Powiązania:
https://bibliotekanauki.pl/articles/23298.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
fauna kopalna
Oviraptorosauria
Dinosauria
ogon
terapody
Theropoda
Mongolia
owiraptorozaury
Nomingia gobiensis
kregi
dinozaury
szkielet
paleontologia
pygostyl
pustynia Gobi
Opis:
A description of Nomingia gobiensis gen. et sp. n., the first known dinosaur with a pygostyle, the structure known so far only in birds, is presented. The specimen comes from the Late Cretaceous strata at Bugin Tsav, Trans-Altai Gobi, Mongolia. N. gobiensis is assigned within the Oviraptorosauria based on the following characters: pneumatized caudal vertebrae, posteriorly concave ischium, and deep cervicodorsal hypapophyses. This specimen has been previously partially described without being formally named (Barsbold et al. 2000).
Opisano nowego dinozaura z grupy terapodów, Nomingia gobiensis gen. et sp. n., z osadów wieku późnokredowego Mongolii w Bugin Caw na Gobi Zaałtajskiej. Niekompletny szkielet pozaczaszkowy tego dinozaura został znaleziony na pustyni Gobi, w Mongolii, przez mongolsko-japońską wyprawę paleontologiczną. Najbardziej charakterystyczną cechą N. gobiensis jest zakończony pygostylem i nieco skrócony ogon, liczący tylko 24 kręgi (Sloan 1999; Barsbold et al. 2000). Pygostyl nie był dotychczas znany u żadnego dinozaura i był uważany za cechę swoistą wyłącznie dla ptaków. N. gobiensis został uznany za przedstawiciela Oviraptorosauria o nieustalonej przynależności rodzinowej, wykazuje jednak pewne podobieństwa do słabo poznanego przedstawiciela rodziny Caenagnathidae, Chirostenotes pergracilis Gilmore, 1924.
Źródło:
Acta Palaeontologica Polonica; 2000, 45, 2; 97-106
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a new troodontid (Dinosauria, Theropoda) from the Early Cretaceous of Mongolia
Nowy przedstawiciel rodziny Troodontidae (Dinosauria, Theropoda) z dolnej kredy Mongolii
Autorzy:
Barsbold, R.
Osmolska, H.
Kurzanov, S.M.
Powiązania:
https://bibliotekanauki.pl/articles/20769.pdf
Data publikacji:
1987
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Described is a fragmentary juvenile theropod skeleton from the Lower Cretaceous deposits (Barunbayanskaya Svita) of the south-eastern Gobi Desert, Mongolian People's Republic. It displays manus and pes structure typical of the family Troodontidae. The preserved fragments do not allow generic determination.
Opisano niekompletny szkielet dinozaura z grupy teropodów, reprezentujący przypuszczalnie młodego osobnika. Okaz został znaleziony w 1979 roku przez radziecko-mongolską ekspedycję w osadach dolnej kredy południowo-wschodniej Gobi, Mongolia. Budowa ręki oraz stopy wskazuje, że jest to przedstawiciel niewielkiej i słabo poznanej rodziny Troodontidae. Dinozaury zaliczane do tej rodziny były dotychczas znane tylko z osadów górnej kredy w Azji (Mongolia) i Północnej Ameryce (Kanada, USA). Większość przedstawicieli Troodontidae wykazuje szczególną specjalizację drugiego palca stopy, który ma zwiększony zakres ruchomości w płaszczyźnie pionowej i znacznie powiększony, zakrzywiony pazur. Te cechy były już wykształcone u dolno-kredowych Troodontidae. Nie stwierdzono natomiast innej charakterystycznej cechy, występującej u górno-kredowych Troodontidae — powiększonej jamy ucha środkowego. Mimo pewnych różnic, znaczna niekompletność szkieletu nie pozwala na wyróżnienie istotnych cech diagnostycznych, rodzajowych i gatunkowych. Praca była wykonana częściowo w ramach problemu CPBP.04.03 oraz w ramach współpracy między Polską i Mongolską Akademią Nauk (temat 2).
Źródło:
Acta Palaeontologica Polonica; 1987, 32, 1-2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The skull of Velociraptor [Theropoda] from the Late Cretaceous of Mongolia
Czaszka drapieznego dinozaura Velociraptor mongoliensis z poznej kredy Mongolii
Autorzy:
Barsbold, R
Osmolska, H
Powiązania:
https://bibliotekanauki.pl/articles/21498.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
fauna kopalna
Velociraptor mongoliensis
czaszki
analiza anatomiczna
Deinonychus antirrhopus
Mongolia
kreda
zuchwa
dinozaury
paleontologia
szkielet
Dromaeosauridae
dromeozaurydy
Opis:
The well preserved material of the Late Cretaceous dromaeosaurid, Velociraptor mongoliensis, has allowed us to supplement earlier descriptions of the skull in this species. The skull of V. mongoliensis is similar to that of Deinonychus antirrhopus, but differs from the latter by: (1) laterally convex supratemporal arcade resulting in short, rounded supratemporal fenestra; (2) depressed nasal; (3) longer maxillary process of premaxilla; (4) lack of separate prefrontal, and (5) convex ventral border of the dentary. These differences, especially that in the structure of the temporal region, support generic distinction of Deinonychus and Velociraptor. Skulls of other dromaeosaurids are compared.
W pracy opisano czaszkę i żuchwę niewielkiego, mierzącego około 2 m długości, drapieżnego dinozaura z rodziny Dromaeosauridae, Velociraptor mongoliensis Osborn, 1924, oraz przedstawiono rozprzestrzenienie geograficzne i stratygraficzne tej rodziny. Badany materiał pochodzi z osadów kampanu (górna kreda) pustyni Gobi (Mongolia) i został zebrany przez mongolskie, polsko-mongolskie, radziecko-mongolskie i japońsko-mongolskie ekspedycje paleontologiczne w latach 1970-1997. Dromeozaurydy żyły w okresie kredowym w Ameryce Północnej i Azji Środkowej. Z sześciu do ośmiu monotypowych rodzajów zaliczanych do tej rodziny, tylko mongolski Velociraptor jest reprezentowany przez dość liczne i kompletne szkielety, pozostałe rodzaje oparte są na pojedynczych i bardzo fragmentarycznych szczątkach, zaś czaszki (znacznie mniej kompletne) znane są tylko u dwóch północnoamerykariskich rodzajów Deinonychus i Dromaeosaurus. Przeprowadzona w pracy analiza anatomiczna kilku czaszek V. mongoliensis i porównanie ich z czaszką wczesnokredowego Deinonychus antirrhopus Ostrom, 1969 wykazały, że nie ma dostatecznych podstaw do uznania nazwy rodzajowej Deinonychus za młodszy synonim nazwy Velociraptor, co było sugerowane przez niektórych badaczy (Paul 1988). Potwierdzono, że oba te rodzaje są ze sobą bliżej spokrewnione niż z innymi przedstawicielami dromeozaurydów.
Źródło:
Acta Palaeontologica Polonica; 1999, 44, 2; 189-219
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new large-bodied theropod dinosaur from the Middle Jurassic of Warwickshire, United Kingdom
Autorzy:
Benson, R.B.J.
Radley, J.D.
Powiązania:
https://bibliotekanauki.pl/articles/22445.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
large-bodied dinosaur
dinosaur
new dinosaur
theropod dinosaur
Middle Jurassic
Jurassic
Warwickshire
United Kingdom
paleontology
Dinosauria
Theropoda
Tetanurae
Megalosaurus
Cruxicheiros
Bathonian
Chipping Norton Limestone Formation
Opis:
Previously undocumented postcranial material from the Chipping Norton Limestone Formation (Middle Jurassic: Lower Bathonian) of Cross Hands Quarry, near Little Compton, Warwickshire represents a new large−bodied theropod dinosaur, distinct from the contemporaneous Megalosaurus bucklandii. Cruxicheiros newmanorum gen. et sp. nov. is diagnosed by a single autapomorphy, the presence of a proximomedially inclined ridge within the groove that marks the lateral extent of the posterior flange of the femoral caput (trochanteric fossa). C. newmanorum shows three tetanuran features: widely separated cervical zygapophyses, a swollen ridge on the lateral surface of the iliac blade and an anterior spur of the caudal neural spines. However, due to fragmentary preservation its affinities within Tetanurae remain uncertain: phylogenetic analysis places it as the most basal tetanuran, the most basal megalosauroid (= spinosauroid) or the most basal neotetanuran.
Źródło:
Acta Palaeontologica Polonica; 2010, 55, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach to evaluate the cursorial ability of the giant theropod Giganotosaurus carolinii
Autorzy:
Blanco, R E
Mazzetta, G V
Powiązania:
https://bibliotekanauki.pl/articles/21508.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Cretaceous
Theropoda
Dinosauria
theropod
dinosaur
Giganotosaurus
South America
Giganotosaurus carolinii
Opis:
The cursorial capability of the South American giant theropod Giganotosaurus carolinii should have been quite limited taking into account the strength indicator of its femur (approximately 7 GPa⁻¹) as well as the risk of experiencing grave or even lethal injuries involved in the falling of this multitonne animal on a run. However, even at low speeds a fall would have caused serious injuries. Thus, in accordance to the approach developed in this study, the maximum speed of Giganotosaurus should be not that which will implicate corporal lesions with minimum probability of lethalness. Instead, its maximum speed should be that which would permit the recovery of body equilibrium as each step is taken. Taking into consideration this approach, an indicator of stability is defined for bipedal, cursorial animals. This indicator is determined by the relationship between the time available for the movement of hip joint during the retraction of a hindlimb and the time needed to move the opposite hindlimb by an angle (in function of the speed) of sufficient magnitude as to facilitate the recovery of body equilibrium. This indicator was used to estimate the maximum speed of locomotion of Giganotosaurus (about 14 m s⁻¹) at which, from a kinematic point of view, the danger of falling does not exist.
Źródło:
Acta Palaeontologica Polonica; 2001, 46, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Osteology of the unenlagiid theropod Neuquenraptor argentinus from the Late Cretaceous of Patagonia
Autorzy:
BRISSÓN EGLI, FEDERICO
ARANCIAGA ROLANDO, ALEXIS M.
AGNOLÍN, FEDERICO L.
NOVAS, FERNANDO E.
Powiązania:
https://bibliotekanauki.pl/articles/945635.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
dinosauria
theropoda
unenlagiidae
neuquenraptor
cretaceous
argentina
patagonia
Opis:
Neuquenraptor argentinus was described as the first undoubted deinonychosaurian theropod from Gondwana. The only known specimen is represented by a fragmentary skeleton, including a nearly complete foot, coming from Late Cretaceous beds of Neuquén Province, Patagonia, Argentina. Neuquenraptor was later considered as belonging to the Southern Hemisphere paravian clade Unenlagiidae, and proposed as a junior synonym of Unenlagia comahuensis. The aim of the present paper is to include a detailed anatomical description of Neuquenraptor (up to the date only known by a preliminary description). Comparisons with other paravians, especially unenlagiids, resulted in the finding of characters that may be considered as diagnostic of Unenlagiidae (e.g., scar-like fourth trochanter of femur, metatarsal II with tongue-shaped process over the caudal surface of metatarsal III, well-developed convex longitudinal plantar crest of metatarsal IV). Furthermore, comparisons between Neuquenraptor and Unenlagia are carried out with the aim to evaluate the possible synonymy between these taxa. These comparisons indicate that at least two similar-sized unenlagiids were present on the Portezuelo Formation. However, in concordance with previous authors, we are not able to support nor dismiss the possible synonymy between Unenlagia and Neuquenraptor. Additional findings of unenlagiid fossils from the Portezulo Formation will help to clarify the taxonomic status of these taxa.
Źródło:
Acta Palaeontologica Polonica; 2017, 62, 3; 549-562
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A reassessment of Kelmayisaurus petrolicus, a large theropod dinosaur from the Early Cretaceous of China
Autorzy:
Brusatte, S.L.
Benson, R.B.J.
Xu, X.
Powiązania:
https://bibliotekanauki.pl/articles/21593.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
Kelmayisaurus petrolicus
large theropod dinosaur
theropod dinosaur
Early Cretaceous
China
Dinosauria
Theropoda
Carcharodontosauridae
anatomy
Cretaceous
Opis:
The Early Cretaceous fossil record of large−bodied theropods from Asia is poor, hindering comparison of Asian predatory dinosaur faunas with those from other continents. One of the few large Asian theropod specimens from this interval is a partial skull (maxilla and dentary) from the Lianmugin Formation (?Valanginian–Albian), the holotype of Kelmayisaurus petrolicus. Most authors have either considered this specimen as an indeterminate basal tetanuran or a nomen dubium. We redescribe K. petrolicus and note that it possesses a single autapomorphy (a deep accessory groove on the lateral surface of the anterior dentary), as well as a unique combination of characters that differentiates it from other theropods, affirming its validity. A phylogenetic analysis recovers K. petrolicus as a basal carcharodontosaurid, which is supported by various features: very deep interdental plates (a carcharodontosaurid synapomorphy), fused interdental plates (present in carchardontosaurids and a limited number of other theropods), and the absence of diagnostic features of other clades of large−bodied theropods such as abelisaurids, megalosauroids, and coelurosaurs. As such,Kelmayisaurusis the second known carcharodontosaurid from Asia, and further evidence that this clade represented a global radiation of large−bodied predators during the Early–mid Cretaceous.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The systematics of Late Jurassic tyrannosauroid theropods from Europe and North America
Autorzy:
Brusatte, S.L.
Benson, R.B.J.
Powiązania:
https://bibliotekanauki.pl/articles/22629.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
systematics
Late Jurassic
tyrannosauroid theropod
theropod
Europe
North America
Dinosauria
Theropoda
Tyrannosauridae
Tyrannosaurus
anatomy
Jurassic
paleontology
Opis:
Recent discoveries of more than ten new species of tyrannosauroid theropods are helping to understand the origin and evolu− tion of colossal body size and other characteristic features of Tyrannosaurus rex and its terminal Cretaceous relatives. Partic− ularly important has been the discovery and reinterpretation of Late Jurassic tyrannosauroids from Europe and North Amer− ica, which are intermediate in size and phylogenetic position between small basal tyrannosauroids and the largest Late Cre− taceous species. The fragmentary nature of these Jurassic specimens, however, has frustrated attempts to understand their systematics and phylogeny. A new specimen from the Late Jurassic of England was recently named as a new species (Stokesosaurus langhami) of the genus Stokesosaurus, which is known from several fragmentary fossils from North Amer− ica. We review the systematics and phylogeny of these European and North American specimens and show that there are no unequivocal synapomorphies uniting them. Furthermore, a revised phylogenetic analysis does not recover them as sister taxa. This necessitates a taxonomic revision of this material, and we name a new genus (Juratyrant) for theBritish specimen.
Źródło:
Acta Palaeontologica Polonica; 2013, 58, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cranial anatomy of tyrannosaurid dinosaurs from the Late Cretaceous of Alberta, Canada
Autorzy:
Currie, P J
Powiązania:
https://bibliotekanauki.pl/articles/20676.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Late Cretaceous
Cretaceous
Canada
Theropoda
dinosaur
Alberta
Saurischia
Coelurosauria
anatomy
Dinosauria
Tyrannosauridae
skull
paleontology
tyrannosaurid dinosaur
Opis:
Beautifully preserved, nearly complete theropod skeletons from Alberta (Canada) allow re−evaluation of the taxonomic status of North American tyrannosaurids. It is concluded that the most parsimonious interpretation of relationships leads to the separation of the two species of Albertosaurus(sensu Russell 1970) into Gorgosaurus libratusfrom the Campanian Dinosaur Park Formation and Albertosaurus sarcophagus from the upper Campanian/lower Maastrichtian Horseshoe Canyon Formation. Albertosaurus and Gorgosaurus are closely related, but can be distinguished from each other by more characters than are known to justify generic distinction within another tyrannosaurid clade that includes Daspletosaurus, Tarbosaurus and Tyrannosaurus. Daspletosaurus is known from multiple species that cover extensive geographic, ecological and temporal ranges, and it is sensible to maintain its generic distinction from Tyrannosaurus. All tyrannosaurid species have consistent ontogenetic trends. However, one needs to be cautious in assessing ontogenetic stage because many characters are size−dependent rather than age−dependent. There are relatively few osteological differences that can distinguish tyrannosaurid species at any age. For example, Nanotyrannus lancensis is probably a distinct species from Tyrannosaurus rex because there is no evidence of ontogenetic reduction of tooth counts in any other tyrannosaurid species. Some characters that are good for separating mature tyrannosaurids, such as differences in the sizes and shapes of maxillary fenestrae, are not useful for identifying the species of juveniles.
Źródło:
Acta Palaeontologica Polonica; 2003, 48, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skull structure and evolution in tyrannosaurid dinosaurs
Autorzy:
Currie, P J
Hurum, J.H.
Sabath, K.
Powiązania:
https://bibliotekanauki.pl/articles/22810.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
parsimonious analysis
phylogenesis
Coelurosauria
Tyrannosauridae
Theropoda
Dinosauria
skull structure
evolution
dinosaur
paleontology
tyrannosaurid dinosaur
Opis:
Tyrannosauridae can be subdivided into two distinct subfamilies—the Albertosaurinae and the Tyrannosaurinae. Previously recognized subdivisions Aublysodontinae and Shanshanosaurinae are rejected because they are based on insufficient material and juvenile specimens. Our results are based upon a phylogenetic analysis using PAUP program (Swofford 1999) of 77 skull characters and seven genera (Albertosaurus, Alioramus, Daspletosaurus, Gorgosaurus, Nanotyrannus, Tarbosaurus, and Tyrannosaurus); with Allosaurus as outgroup. Of the 77 characters used, more than half were parsimony informative. Asingle most parsimonious tree was obtained with the Tree Length being 88. The analysis of cranial characters and comparison of postcranial features reveal that Tarbosaurus bataar is not the sister taxon of Tyrannosaurus rex (contra Holtz 2001). Their similarities are partially due to the fact that both are extremely large animals. Thus, Tarbosaurus should be considered a genus distinct from Tyrannosaurus.
Źródło:
Acta Palaeontologica Polonica; 2003, 48, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New data on small theropod dinosaurs from the Upper Jurassic Morrison Formation of Como Bluff, Wyoming, USA
Autorzy:
Dalman, S.
Powiązania:
https://bibliotekanauki.pl/articles/2077332.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
dinosaurs
theropoda
Upper Jurassic
Morrison Formation
Como Bluff
western USA
dinozaury
teropody
górna jura
Formacja Morrisona
zachodnie USA
Opis:
In 1879, Othniel C. Marsh and Arthur Lakes collected in the Upper Jurassic Morrison Formation Quarry 12 at Como Bluff, Wyoming, USA, several isolated axial and appendicular skeletal elements of small theropod dinosaurs. Since the discovery the specimens remained unnoticed for over a century. The skeletal remains of small theropods are rare at Como Bluff and throughout the Morrison Formation. Their bones are delicately constructed, so they are not as well-preserved as the bones of large-bodied theropods. The bones of small theropods described here were found mixed with isolated crocodile teeth and turtle shells. Comparison of the skeletal materials with other known theropods from the Morrison Formation reveals that some of the bones belong to a very small juvenile Allosaurus fragilis and Torvosaurus tanneri and also to a new ceratosaur taxon, here named Fosterovenator churei, whereas the other bones represent previously unidentified juvenile taxa of basal tetanuran and coelurid theropods. The discovery and description of these fossil materials is significant because they provide important information about the Upper Jurassic terrestrial fauna of Quarry 12, Como Bluff, Wyoming. The presence of previously unidentified theropod taxa in the Morrison Formation indicates that the diversity of basal tetanuran and coelurid theropods may have been much greater than previously expected. Although the fossil material here described is largely fragmentary, it is tenable that theropods of different clades co-existed in the same ecosystems at the same time and most likely competed for the same food sources.
Źródło:
Volumina Jurassica; 2014, 12, 2; 181--196
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Osteology of a large allosauroid theropod from the Upper Jurassic (Tithonian) Morrison Formation of Colorado, USA
Autorzy:
Dalman, S.
Powiązania:
https://bibliotekanauki.pl/articles/2077330.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
dinosaur
theropoda
allosauridae
Morrison Formation
Upper Jurassic
Colorado
dinozaury
teropody
allozaury
Formacja Morrisona
górna jura
Opis:
Two partial skeletons of allosaurid theropods belonging to an adult and a juvenile from the Upper Jurassic (Tithonian) Morrison Formation of McElmo Canyon in Montezuma County, southwestern Colorado, were discovered in 1953 by the late Joseph T. Gregory and David Techter. The adult specimen consists of several isolated cranial and postcranial skeletal elements that are exceptionally well-preserved and include the left premaxilla, maxilla, dentary, teeth, quadratojugal, two caudal vertebrae, pubic peduncle, ischium, proximal tibia, a nearly complete left foot, and several isolated teeth, whereas the juvenile specimen is represented by the distal portion of the right dentary and a fragmentary splenial. The specimens represent a new species of Allosaurus, here named Allosaurus lucasi, which differs from Allosaurus fragilis by having a relatively short premaxilla and robust quadratojugal with short jugal process and a short quadrate process of the quadratojugal that is at the same level as the rostral quadratojugal ramus. The presence of a new species of Allosaurus in the Tithonian of North America provides further evidence of the taxonomic and morphological diversity of the Allosauridae clade and their continuous evolutionary success, which extended to the Cretaceous.
Źródło:
Volumina Jurassica; 2014, 12, 2; 159--180
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Caudipteryx as a non-avalian theropod rather than a flightless bird
Autorzy:
Dyke, G J
Norell, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/22434.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
bird
Avialae
feather
Cretaceous
Caudipteryx zoui
China
Theropoda
Dinosauria
Yixian Formation
paleontology
Opis:
Caudipteryx zoui is a small enigmatic theropod known from the Early Cretaceous Yixian Formation of the People’s Republic of China. From the time of its initial description, this taxon has stimulated a great deal of ongoing debate regarding the phylogenetic relationship between non−avialan theropods and birds (Avialae) because it preserves structures that have been uncontroversially accepted as feathers (albeit aerodynamically unsuitable for flight). However, it has also been proposed that both the relative proportions of the hind limb bones (when compared with overall leg length), and the position of the center of mass in Caudipteryx are more similar to those seen in extant cusorial birds than they are to other non−avialan theropod dinosaurs. This conclusion has been used to imply that Caudipteryx may not have been correctly interpreted as a feathered non−avialan theropod, but instead that this taxon represents some kind of flightless bird. We review the evidence for this claim at the level of both the included fossil specimen data, and in terms of the validity of the results presented. There is no reason—phylogenetic, morphometric or otherwise—to conclude that Caudipteryx is anything other than a small non−avialan theropod dinosaur.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Macroevolutionary and morphofunctional patterns in theropod skulls: A morphometric approach
Autorzy:
Foth, C.
Rauhut, O.W.M.
Powiązania:
https://bibliotekanauki.pl/articles/21033.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
macroevolution
theropod dinosaur
skull
Theropoda
feeding ecology
biomechanics
evolution
Mesozoic
paleontology
Opis:
Theropod dinosaurs are one of the most remarkable lineages of terrestrial vertebrates in the Mesozoic, showing high taxo− nomic and ecological diversity. We investigate the cranial diversity of non−avian theropods and some basal birds, using geometric morphometrics to obtain insights into the evolutionary modifications of the skull. Theropod skulls mostly vary in the shape of the snout and length of the postorbital region (principal component [PC] 1), with further variation in orbit shape, depth of the postorbital region, and position of the jaw joint (PC 2 and PC 3). These results indicate that the cranial shape of theropods is closely correlated with phylogeny and dietary preference. Skull shapes of non−carnivorous taxa dif− fer significantly from carnivorous taxa, suggesting that dietary preference affects skull shape. Furthermore, we found a significant correlation between the first three PC axes and functional proxies (average maximum stress and an indicator of skull strength). Interestingly, basal birds occupy a large area within the morphospace, indicating a high cranial, and thus also ecological, diversity. However, we could include only a small number of basal avialan species, because their skulls are fragile and there are few good skull reconstructions. Taking the known diversity of basal birds from the Jehol biota into account, the present result might even underestimate the morphological diversity of basal avialans.
Źródło:
Acta Palaeontologica Polonica; 2013, 58, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The teeth of the unenlagiine theropod Buitreraptor from the Cretaceous of Patagonia, Argentina, and the unusual dentition of the Gondwanan dromaeosaurids
Autorzy:
Gianechini, F.A.
Makovicky, P.J.
Apesteguia, S.
Powiązania:
https://bibliotekanauki.pl/articles/20408.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
tooth
unenlagiine theropod
theropod
Buitreraptor
Cretaceous
Patagonia
Argentina
dentition
Gondwanan dromaeosaurid
dromaeosaurid
Theropoda
Dromaeosauridae
Unenlagiinae
Dinosauria
paleontology
dinisaur tooth
Opis:
The Unenlagiinae is a clade of Gondwanan dromaeosaurid theropods mainly known from incomplete skeletal material. The group includes two recently discovered theropods, Buitreraptor and Austroraptor, from which cranial remains are available with in situ maxillary and dentary teeth, thus allowing the study of tooth morphology. Among the derived traits that diagnose the dentition of unenlagiines are: (i) high tooth count, (ii) small size of individual teeth when compared with skull height, (iii) absence of denticles and carinae, and (iv) presence of longitudinal grooves on the tooth crown. This suite of dental characteristics, shared between Buitreraptor and Austroraptor, can be considered as diagnostic of the Unenlagiinae or, at least, a more exclusive clade within the group. The teeth of Buitreraptor exhibit a remarkable labiolingual compression, whereas Austroraptor possesses more conical teeth, probably respective autapomorphic features. On one hand, these dental morphologies differ from those observed in most Laurasian dromaeosaurids and, for instance, could be considered as further proof of the purported vicariant evolution of the lineage on the southern continents. On the other hand, the morphological similarities (e.g., absence of denticles) between the teeth of unenlagiines and other theropod lineages, including Mesozoic birds and ornithomimosaurs, can be considered as the result of parallel trends related to dental reduction.
Źródło:
Acta Palaeontologica Polonica; 2011, 56, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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