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Tytuł:
An enigmatic theropod Cryolophosaurus: reviews and comments on its paleobiology
Autorzy:
Yun, Changyu
Powiązania:
https://bibliotekanauki.pl/articles/2060953.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Cryolophosaurus
dinosauria
theropoda
ecology
Antarctica
kriolofozaur
dinozaury
teropod
ekologia
Antarktyda
Opis:
Cryolophosaurus is a genus of theropod dinosaur that is characterized by its distinctive crest formed by dorsally expanded lacrimals. Although its fossils are rare, currently recognized materials suggest this taxon was the largest predator in the Early Jurassic times in Antarctica, indicating it was the apex predator in its ecosystem. The skeleton of Cryolophosaurus bears both advanced and basal characteristics of theropods, making its position within theropod phylogenetic tree controversial. Its unusual anatomical features, size, and the habitat located close to the Jurassic polar circle all differ from other Early Jurassic theropods, indicating it was one of the most ecologically significant taxon of all theropods.
Źródło:
Volumina Jurassica; 2019, 17, 1; 103--110
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A tyrannosaurid pedal ungual from the Williams Fork Formation (Campanian) of Colorado and its implications for the biogeography of Laramidian dinosaurs
Autorzy:
Yun, Chan-Gyu
Powiązania:
https://bibliotekanauki.pl/articles/24024717.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
dinosauria
theropoda
tyrannosauridae
fossil record
pedal ungual anatomy
dinosaur biogeography
dinozaury
teropody
tyranozaury
zapis kopalny
anatomia
pazury
biogeografia
Opis:
A right theropod pedal ungual phalanx II-3 from the Campanian Williams Fork Formation of northwestern Colorado is described, and a combination of features, including the large size, tapering distal tip, robust and stout overall form, triangular cross-section, and a relatively flat ventral surface allows a confident referral to Tyrannosauridae Osborn, 1906. Although this specimen was found in a relatively southern state, the proximal articular surface of this ungual is similar to that of Gorgosaurus libratus Lambe, 1914, a taxon found in the northern state, Alberta. Although based on limited evidence, this may suggest that the range of tyrannosaurids considered endemic to the north of Laramidia extended farther south than previously thought.
Źródło:
Acta Geologica Polonica; 2023, 73, 1; 63--72
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Allometric growth in the frontals of the Mongolian theropod dinosaur Tarbosaurus bataar
Autorzy:
Yun, C.-G.
Peters, G.F.
Currie, P.J.
Powiązania:
https://bibliotekanauki.pl/articles/31341395.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
allometric growth
frontal bone
growth change
Mongolia
dinosaur
theropod dinosaur
Tarbosaurus bataar
Dinosauria
Theropoda
Tyrannosauridae
Tyrannosaurus rex
ontogenesis
allometry
Źródło:
Acta Palaeontologica Polonica; 2022, 67, 3; 601-615
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Osteology of the Late Cretaceous alvarezsauroid Linhenykus monodactylus from China and comments on alvarezsauroid biogeography
Autorzy:
Xu, X.
Upchurch, P.
Ma, Q.
Pittman, M.
Choiniere, J.
Sullivan, C.
Hone, D.W.E.
Tan, Q.
Tan, L.
Xiao, D.
Han, F.
Powiązania:
https://bibliotekanauki.pl/articles/20629.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
osteology
Cretaceous
Late Cretaceous
alvarezsauroid
Linhenykus monodactylus
China
biogeography
Dinosauria
Theropoda
Parvicursorinae
Treefitte
dispersal
vicariance
sympatry
Wulansuhai Formation
Inner Mongolia
Opis:
The alvarezsauroid theropod Linhenykus monodactylus from the Upper Cretaceous of Inner Mongolia, China is the first knownmonodactyl non−avian dinosaur, providing important information on the complex patterns of manual evolution seen in alvarezsauroids. Herewe provide a detailed description of the osteology of this taxon. Linhenykus shows a number of fea− tures that are transitional between parvicursorine and non−parvicursorine alvarezsauroids, but detailed comparisons also re− veal that some characters had a more complex distribution. We also use event−based tree−fitting to perform a quantitative analysis of alvarezsauroid biogeography incorporating several recently discovered taxa. The results suggest that there is no statistical support for previous biogeographic hypotheses that favour pure vicariance or pure dispersal scenarios as explana− tions for the distributions of alvarezsauroids across SouthAmerica, NorthAmerica andAsia. Instead, statistically significant biogeographic reconstructions suggest a dominant role for sympatric (or “within area”) events, combined with a mix of vicariance, dispersal and regional extinction. At present the alvarezsauroid data set is too small to completely resolve the biogeographic history of this group: future studies will need to create larger data sets that encompass additional clades.
Źródło:
Acta Palaeontologica Polonica; 2013, 58, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Velociraptorine dromaeosaurid teeth from the Kimmeridgian [Late Jurassic] of Germany
Autorzy:
van der Lubbe, T
Richter, U.
Knotschke, N.
Powiązania:
https://bibliotekanauki.pl/articles/21506.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
velociraptorine dromaeosaurid
tooth
Kimmeridgian
Late Jurassic
Jurassic
Germany
Saurischia
Theropoda
Dromaeosauridae
dromaeosaurid
paleontology
Opis:
Six theropod teeth from a Late Jurassic (Kimmeridgian) bone bed in Langenberg Quarry of Oker (Goslar, Germany) are identified as a new dromaeosaurid taxon, here left in open nomenclature. Direct comparison reveals that the teeth are very similar to velociraptorine dromaeosaurid teeth from the Guimarota coal mine (Late Jurassic, Portugal) and to velociraptorine dromaeosaurid teeth from Uña (Barremian, Cuenca Province, Spain). Our data indicate that the teeth from the Kimmeridgian of Lower Saxony are of velociraptorine dromaeosaurid type, and therefore represent one of the oldest occurrences of the group Dromaeosauridae.
Źródło:
Acta Palaeontologica Polonica; 2009, 54, 3; 401-408
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fused and vaulted nasals of tyrannosaurid dinosaurs: Implications for cranial strength and feeding mechanics
Autorzy:
Snively, E.
Henderson, D.M.
Phillips, D.S.
Powiązania:
https://bibliotekanauki.pl/articles/21688.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Carnosauria
computer tomography
Theropoda
Tyrannosauridae
biomechanics
computer modelling
dinosaur
feeding mechanism
paleontology
theropod dinosaur
tyrannosaurid dinosaur
cranial strength
Opis:
Tyrannosaurid theropods display several unusual adaptations of the skulls and teeth. Their nasals are fused and vaulted, suggesting that these elements braced the cranium against high feeding forces. Exceptionally high strengths of maxillary teeth in Tyrannosaurus rex indicate that it could exert relatively greater feeding forces than other tyrannosaurids. Areas and second moments of area of the nasals, calculated from CT cross−sections, show higher nasal strengths for large tyrannosaurids than for Allosaurus fragilis. Cross−sectional geometry of theropod crania reveals high second moments of area in tyrannosaurids, with resulting high strengths in bending and torsion, when compared with the crania of similarly sized theropods. In tyrannosaurids trends of strength increase are positively allomeric and have similar allometric exponents, indicating correlated progression towards unusually high strengths of the feeding apparatus. Fused, arched nasals and broad crania of tyrannosaurids are consistent with deep bites that impacted bone and powerful lateral movements of the head for dismembering prey.
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolated theropod teeth from the Middle Jurassic of Niger and the early dental evolution of Spinosauridae
Autorzy:
Serrano-Martínez, A.
Vidal, D.
Sciscio, L.
Ortega, F.
Knoll, F.
Powiązania:
https://bibliotekanauki.pl/articles/21288.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
theropod
tooth
Middle Jurassic
Jurassic
dental evolution
Spinosauridae
Theropoda
Megalosauridae
dental morphology
multivariate analysis
Africa
Opis:
Four isolated theropod teeth from the ?Bathonian “Argiles de l’Irhazer” in Niger are described. The teeth were found in association with the holotype of the basal sauropod Spinophorosaurus nigerensis. These specimens have been assigned to two different taxa by independent analyses, such as direct comparison with teeth previously described in the literature, discriminant and morphometric analyses from metric characters, and cladistic and cluster analyses from discrete characters. The results suggest that three teeth share affinities with those of Megalosauridae and Allosauridae, belonging most likely to the former. The fourth tooth might be from a member of the stem group Spinosauridae. If so, this would be the oldest representative of this clade. This tooth shows a combination of characters that are unusual in typical spinosaurid teeth (crown moderately compressed labiolingually and curved distally with minute denticles on the carina and a deeply veined enamel surface texture without apicobasal ridges). This could shed light on the morphological transition from the plesiomorphic ziphodont dental pattern to that of Spinosauridae. This tooth would also allow a better understanding of the origin of the spinosaurids, supporting a Gondwanan origin for the group.
Źródło:
Acta Palaeontologica Polonica; 2016, 61, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Basal abelisaurid and carcharodontosaurid theropods from the Lower Cretaceous Elrhaz Formation of Niger
Autorzy:
Sereno, P C
Brusatte, S.L.
Powiązania:
https://bibliotekanauki.pl/articles/21335.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Allosauroidea
Cretaceous
Elrhaz Formation
paleontology
Eocarcharia
Africa
Lower Cretaceous
Theropoda
Kryptops
carcharodontosaurid theropod
Abelisauridae
theropod
Carcharodontosauridae
abelisaurid theropod
Niger
Opis:
We report the discovery of basal abelisaurid and carcharodontosaurid theropods from the mid Cretaceous (Aptian–Albian, ca. 112 Ma) Elrhaz Formation of the Niger Republic. The abelisaurid, Kryptops palaios gen. et sp. nov., is represented by a single individual preserving the maxilla, pelvic girdle, vertebrae and ribs. Several features, including a maxilla textured externally by impressed vascular grooves and a narrow antorbital fossa, clearly place Kryptops palaios within Abelisauridae as its oldest known member. The carcharodontosaurid, Eocarcharia dinops gen. et sp. nov., is represented by several cranial bones and isolated teeth. Phylogenetic analysis places it as a basal carcharodontosaurid, similar to Acrocanthosaurus and less derived than Carcharodontosaurus and Giganotosaurus. The discovery of these taxa suggests that large body size and many of the derived cranial features of abelisaurids and carcharodontosaurids had already evolved by the mid Cretaceous. The presence of a close relative of the North American genus Acrocanthosaurus on Africa suggests that carcharodontosaurids had already achieved a trans−Tethyan distribution by the mid Cretaceous.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scapular orientation in theropods and basal birds, and the origin of flapping flight
Autorzy:
Senter, P
Powiązania:
https://bibliotekanauki.pl/articles/21712.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
bird
Archaeopteryx
Aves
flight
Theropoda
flapping flight
theropod
basal bird
paleontology
Opis:
Basal birds such as Archaeopteryx and Confuciusornis are typically portrayed as flapping fliers. However, here I show that shoulder joint orientation in these animals prevented elevation of the humerus above the dorsum, thereby preventing use of the recovery stroke, an important part of flapping flight. In members of the clade Ornithothoraces, which includes extant birds and the extinct avian clade Enantiornithes, the shoulder joint is reoriented to permit elevation of the humerus above the dorsum, permitting flapping flight. Although basal birds may have glided, flapping flight began significantly later in avian evolution than has been thought.
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The endocranium of the theropod dinosaur Ceratosaurus studied with computer tomography
Autorzy:
Sanders, R K
Smith, D.K.
Powiązania:
https://bibliotekanauki.pl/articles/22430.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
cranial pneumatic system
Ceratosaurus
virtual rendering
paleoneurology
Theropoda
theropod dinosaur
computer tomography
dinosaur
endocranium
paleontology
Opis:
A well preserved specimen of the theropod Ceratosaurusfrom the Upper Jurassic Morrison Formation of western Colorado was recently described and given the name C. magnicornis. The systematics of the genus is outside the scope of the present study but, as a generally accepted basal tetanuran, the braincase was CT scanned to provide a description of the endocranium, inner ear, pneumatic, and venous sinus systems in a primitive member of this clade. Five major subregions of the theropod endocranium are distinguished for the purpose of simplifying cranial computed tomographic interpretation and to provide a systematic means of comparison to other endocrania. The skull morphology of Ceratosaurus influences the overall braincase morphology and the number and distribution of the major foramina. The low pontine angle and relatively unflexed braincase is considered a more primitive character. The orientation of the horizontal semicircular canal confirms a rather horizontal and unerect posture of the head and neck. As in birds, the narrower skull morphology of Ceratosaurusis associated with fewer cranial nerve foramina. Additionally, the maxillary dominated dentigerous upper jaw of Ceratosaurusis felt to share with the alligator a large rostrally directed maxillary division of the trigeminal nerve and a small ophthalmic branch. The upper bill of birds, being dominated by the premaxillary and lacking teeth, is innervated predominantly by the ophthalmic division of the trigeminal nerve. For this reason, avian−based cranial nerve reconstructions are felt to be inappropriate for basal theropods.Ceratosaurusskull pneumatization and possible evidence of olfactory conchal structures is on the other hand very avian in character. Based on computed tomography, Ceratosaurusis determined to have possessed a typical basal theropod endocranium and bipedal vestibular system similar to Allosaurus.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Filling the ceratosaur gap: A new ceratosaurian theropod from the Early Cretaceous of Spain
Autorzy:
Sanchez-Hernandez, B.
Benton, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/945890.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
filling
ceratosaur gap
new theropod
theropod
ceratosaurian theropod
paleontology
Dinosauria
Theropoda
Ceratosauria
Barremian
Early Cretaceous
Cretaceous
Spain
Opis:
Ceratosaurian theropods evolved in two bursts, first in the Middle and Late Jurassic and then in the Late Cretaceous, leaving a 20 Myr gap in the Early Cretaceous during which remains are rare. We describe here a new ceratosaurian theropod, Camarillasaurus cirugedae, from fluvial deposits of the Camarillas Formation (lower Barremian, Lower Cretaceous) of Camarillas, Teruel Province, NE Spain. The new theropod is represented by a collection of associated bones, including a tooth, a possible cervical vertebra, two sternal plates, the proximal part of a right tibia, a broken right scapulocoracoid, the incomplete sacrum, five caudal vertebrae, an isolated caudal neural arch, a chevron, an almost complete presacral rib and some fragments of vertebrae, ribs, and other elements. Camarillasaurus is differentiated from other theropods by the extreme depth of the tibia proximal end, and a deep longitudinal groove on the tibia. The new dinosaur is a ceratosaur, phylogenetically close to the base of the clade, and perhaps more derived than the Chinese basal ceratosaur Limusaurus. The new taxon is significant in the evolution of the ceratosaurian dinosaurs, being placed temporally between its more common Jurassic and mid-Upper Cretaceous relatives, and it is one of only a few from Laurasia.
Źródło:
Acta Palaeontologica Polonica; 2014, 59, 3; 581-600
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oviraptorosaur tail forms and functions
Autorzy:
Persons,IV, W.S.
Currie, P.J.
Norell, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/945893.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Dinosauria
paleozoology
Theropoda
Oviraptorosauria
oviraptorosaur
pygostyle
caudal musculature
functional morphology
Opis:
Oviraptorosaur caudal osteology is unique among theropods and is characterized by posteriorly persistent and exceptionally wide transverse processes, anteroposteriorly short centra, and a high degree of flexibility across the pre-pygostyle vertebral series. Three-dimensional digital muscle reconstructions reveal that, while oviraptorosaur tails were reduced in length relative to the tails of other theropods, they were muscularly robust. Despite overall caudal length reduction, the relative size of the M. caudofemoralis in most oviraptorosaurs was comparable with those of other non-avian theropods. The discovery of a second Nomingia specimen with a pygostyle confirms that the fused terminal vertebrae of the type specimen were not an abnormality. New evidence shows that pygostyles were also present in the oviraptorosaurs Citipati and Conchoraptor. Based on the observed osteological morphology and inferred muscle morphology, along with the recognition that many members of the group probably sported broad tail-feather fans, it is postulated that oviraptorosaur tails were uniquely adapted to serve as dynamic intraspecific display structures. Similarities, including a reduced vertebral series and a terminal pygostyle, between the tails of oviraptorosaurs and the tails of theropods widely accepted as basal members of the Avialae, appear to be convergences.
Źródło:
Acta Palaeontologica Polonica; 2014, 59, 3; 553-567
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Why tyrannosaurid forelimbs were so short: An integrative hypothesis
Autorzy:
Padian, Kevin
Powiązania:
https://bibliotekanauki.pl/articles/2216272.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Dinosauria
Theropoda
Tyrannosaurus
Abelisaurus
Carcharodontosaurus
predation
limb proportions
Opis:
The unusually shortened limbs of giant theropods, including abelisaurids, carcharodontosaurids, and derived tyrannosauroids such as Tyrannosaurus rex have long been an object of wonder, speculation, and even derision on the part of both paleontologists and the public. Two questions commonly asked are “Why did the forelimbs become so short?” and “What did the animals use such short forelimbs for, if for anything?” Because basal tyrannosauroids and their outgroups, as well as the outgroups of other giant theropods, had longer forelimbs, the foreshortening of these elements in derived taxa was secondary, and it ostensibly involved a shift in developmental timing of the forelimb elements. Factors proposed to have influenced the evolutionary foreshortening include natural selection, sexual selection, energetic compensation, ontogenetic vagaries, and rudimentation due to disuse. Hypotheses of use have varied from a supporting anchor that allows the hindlimbs a purchase to stand from a reclining position to a pectoral version of pelvic claspers during intercourse to a sort of waving display during sexual or social selection. None of these hypotheses explain selective regimes for reduction; at best, they might argue for maintenance of the limb, but in all cases a larger limb would have suited the function better. It is likely that we have been looking the wrong way through the telescope, and that no specific function of the forelimbs was being selected; instead, another crucial adaptation of the animal profited from forelimb reduction. Here I propose, in the context of phylogenetic, ontogenetic, taphonomic, and social lines of evidence, that the forelimbs became shorter in the context of behavioral ecology: the great skull and jaws provided all the necessary predatory mechanisms, and during group-feeding on carcasses, limb reduction was selected to keep the forelimbs out of the way of the jaws of large conspecific predators, avoiding injury, loss of blood, amputation, infection, and death. A variety of lines of evidence can test this hypothesis.
Źródło:
Acta Palaeontologica Polonica; 2022, 67, 1; 63-76
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An unusual theropod dinosaur from the Late Cretaceous Nemegt Formation of Mongolia
Autorzy:
Osmolska, H
Powiązania:
https://bibliotekanauki.pl/articles/22126.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Theropoda
Mongolia
gady kopalne
skamienialosci
kosci
Bagaraatan ostromi
dinozaury
paleontologia
paleozoologia
Kotlina Nemegt
anatomia zwierzat
Opis:
An incomplete skeleton of a theropod dinosaur, Bagaraatan ostromi gen, et sp. n., was found in the Nemegt Fm. at Nemegt, Mongolia. The mandible in B. ostromi has a shallow but massive dentary, relatively deep postdentary portion with two surangular foramina and somewhat elongated retroarticular process; on the lateral surface of the postacetabular process of the ilium there are two large depressions for muscle origins separated by a crestlike projection; the fibula is fused distally with the tibiotarsus and the coalesced astragalocalcaneum. Bagaraatan represents the Tetanurae and displays some synapomorphies with the Avetheropoda, however, incompleteness of the skeleton of B. ostromi does not allow to determine its more precise affiliation. Bagaraatan was about 3.0-3.5 m long, had a relatively small head and slender hind limbs. The presence of strongly developed hyposphenes in a long series of anterior caudals rendered its tail only slighily flexible proximally.
W pracy opisano nowego mięsożernego dinozaura Bagaraatan ostromi gen. et sp. n. (Theropoda). Okaz obejmujący żuchwę, serię 25 kręgów ogonowych, fragmenty kości miednicy oraz kończyny tylnej, został znaleziony w osadach formacji Nemegt (?środkowy mastrycht) Kotliny Nemegt (Pustynia Gobi, Mongolia) przez Polsko-Mongolską Ekspedycję Paleontologiczną, w l970 roku. Zachowane szczątki świadczą, że B. ostromi był teropodem ok. 3.0-3.5 m długim, o smukłych kończynach tylnych i usztywnionym ogonie. Długość żuchwy wskazuje, że czaszka była stosunkowo niewielka. Żuchwa jest masywna i zaopatrzona była w silne zęby, z których zachowały się tylko korzenie i podstawy koron. Jej część tylna jest dość wysoka i przypomina żuchwy teropodów zaliczanych do polifiletycznej grupy „Carnosauria”, różni się jednak od nich bardziej wydłużonym wyrostkiem pozastawowym i dwoma, zamiast jednego, otworami w kości nadkątowej. W odróżnieniu od większości znanych teropodów, u których najwyżej tylko kilka przednich kręgów ogonowych wykazuje obecność dodatkowych wyrostków (hyposfenów) wzmacniających połączenia międzykręgowe, u B. ostromi wyrostki te występują między kilkunastoma proksymalnymi kręgami ogonowymi, co ograniczało ruchomość ogona także w tym odcinku. Kość biodrowa B. ostromi wyróżnia się obecnością dwóch zagłębień na bocznej stronie wyrostka zapanewkowego, zapewne dla przyczepu bardzo silnego mięśnia biodrowo-udowego. Takie zagłębienia nie są znane u żadnych innych dinozaurów. W budowie podudzia zwraca uwagę częściowy zrost kości piszczelowej i strzałkowej ze sobą oraz z proksymalnym rzędem kości stępu. Zrost tych kości spotykany jest tylko w jednej, prymitywnej grupie teropodów, Ceratosauria, od której jednak B. ostromi różni się szeregiem zaawansowanych cech. Fragmentaryczność materiału, a zwłaszcza brak czaszki i kończyn przednich, sprawiają trudność w zaliczeniu Bagaraatan do jednej ze znanych jednostek taksonomicznych w obrębie Theropoda. Jednak pewne cechy diagnostyczne wskazują, że rodzaj ten jest przedstawicielem Tetanurae Gauthier 1986 i jest najbliżej spokrewniony z Avetheropoda Paul 1988, aczkolwiek jest od nich prymitywniejszy.
Źródło:
Acta Palaeontologica Polonica; 1996, 41, 1; 1-38
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolated theropod teeth from the Cretaceous strata of Khouribga, Morocco
Autorzy:
Niedźwiedzki, G.
Gierliński, G.
Powiązania:
https://bibliotekanauki.pl/articles/2059918.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Morocco
Cretaceous
theropoda
dinosauria
Carcharodontosauridae
Spinosauridae
Opis:
Predatory dinosaur (Theropoda) teeth are described from Khouribga near Casablanca (Ad-Dar al-Bajda) in northern Morocco. A morphological study of specimens shows that two teeth represent the family Spinosauridae. A third tooth shows features characteristic of the genus Carcharodontosaurus. These are the first finds of dinosaurs from Khouribga.
Źródło:
Geological Quarterly; 2002, 46, 1; 97-100
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
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