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    Wyświetlanie 1-9 z 9
    Tytuł:
    New ornithischian dinosaur footprints in the Jurassic of Poland
    Autorzy:
    Gierliński, G.
    Gaździcka, E.
    Niedźwiedzki, G.
    Pieńkowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059274.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Polska
    Hettangian
    Kimmeridgian
    Ornithischia
    dinosaurs
    footprints
    Opis:
    New stratigraphic horizons with the ornithischian footprints have been found in central Poland. Basal thyreophoran ichnites are reported from the middle Hettangian Skloby Formation of Gromadzice. They support the previous conclusion that small and medium-sized Early Jurassic ornithischians preferred a coastal habitat with low-rise vegetation. Another find, an ornithopod footprint, came from the early Kimmeridgian Glowaczow Formation of Ozarow quarry. The track was discovered within the shallow-marine succession of calcareous deposits, which contributes to the interpretation of synsedimentary emersion of that area during the early Kimmeridgian.
    Źródło:
    Geological Quarterly; 2001, 45, 2; 205-210
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New information on ornithopod dinosaurs from the Late Jurassic of Portugal
    Autorzy:
    Rotatori, F.M.
    Moreno-Azanza, M.
    Mateus, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082127.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Dinosauria
    Ornithischia
    Iguanodontia
    taxonomy
    systematics
    biogeograhy
    Jurassic
    Lourinhã Formation
    Portugal
    Opis:
    Ornithopods are one of the most speciose group of herbivorous dinosaurs, rising during the Jurassic and getting extinct at the Cretaceous–Paleogene boundary. However, most of the attention has been given to derived forms (hadrosaurids). Herein, cranial and post-cranial ornithopod material from the Upper Jurassic Lourinhã Formation and housed at Museu da Lourinhã is described and discussed. Comparison and phylogenetic analyses has allowed the attribution of the material either to Dryosauridae or to Ankylopollexia. The large-sized taxa conservatively ascribed to Ankylopollexia, resemble more closely Early Cretaceous styracosternans than Late Jurassic taxa. Due to the lack of autapomorphic characters, it was not possible to assign the material to any of the two valid Jurassic ornithopod Portuguese species, Draconyx loureiroi and Eousdryosaurus nanohallucis, although phylogenetic analyses hint a close relationship between the Lourinhã dryosaurid material and E. nanohallucis. Principal Component Analysis plotting limb bones proportions indicates a not fully mature ontogenetic stage for the Portuguese specimens. Comparing the Portuguese ornithopod fauna with the one in Morrison Formation and Kimmeridge Clay Formation, it is remarked the key-role of Portugal to understand biogeographic patterns in the distribution of iguanodontians.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 1; 35-57
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The enamel microstructure of Manidens condorensis: New hypotheses on the ancestral state and evolution of enamel in Ornithischia
    Autorzy:
    Becerra, M.G.
    Pol, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082136.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Dinosauria
    Ornithischia
    Heterodontosauridae
    Manidens
    enamel microstructure
    evolution
    Jurassic
    Argentina
    Opis:
    Previous studies on enamel microstructure in Ornithischia have focused on derived lineages of this clade based on species from the northern hemisphere. Here we describe the enamel microstructure of Manidens condorensis from the late Early Jurassic of Argentina that belongs to Heterodontosauridae (interpreted as the basal-most clade of Ornithischia). Enamel microstructure in the cheek teeth lacks a basal unit layer, presents incipient divergent crystallite as the dominant enamel type and parallel crystallite enamel type (with or without incrementing lines). Enamel of maxillary and dentary teeth differs from each other in enamel distribution (asymmetric vs. symmetric), structure (presence vs. absence of tubules, and less vs. more abundant parallel crystallite enamel with incrementing lines) and ordering (regular ordering of enamel types vs. in patches). The enamel microstructure of Manidens is the simplest of all known Ornithischia, and is more similar to that of the sauropodomorph Plateosaurus than to the one reported for the basal theropod Coelophysis. Similarities within Ornithischia are present with pachycephalosaurids and, to a lesser extent, with ankylosaurs. Phylogenetic optimization of enamel characters in Ornithischia allows the inference of new ancestral states for the internal nodes of the major lineages and to highlight evolutionary transformations: (i) absence of a basal unit layer and presence of parallel crystallite and incipient divergent columnar enamel as the ancestral state for Ornithischia; (ii) the shared presence of incipient divergent columnar units or poorly developed divergent columnar enamel in Pachycephalosauridae and Thyreophora represents a retention of the plesiomorphic ornithischian condition; (iii) the wavy enamel of Dryomorpha evolved from the ancestral incipient divergent columnar units present in Ornithopoda and; (iv) enamel thickness and asymmetry has independently evolved at least four times in Ornithischia.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 1; 59-70
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New psittacosaurid highlights skull enlargement in horned dinosaurs
    Autorzy:
    Sereno, P C
    Xijin, Z.
    Brown, L.
    Lin, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/23127.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Psittacosaurus
    systematics
    Cretaceous
    Dinosauria
    China
    Marginocephalia
    dinosaur
    skull length
    Yixian Formation
    paleontology
    Ornithischia
    Opis:
    A new psittacosaurid is based on a nearly complete articulated skeleton from northeastern China that differs principally in skull size as compared to the most common and widespread species, Psittacosaurus mongoliensis. The skull of Psittacosaurus majorsp. nov., is 25% larger despite very similar postcranial skeletal dimensions. Such selective skull enlargement is very unusual. Skull size in ceratopsians, in general, scales with positive allometry relative to body mass: species of greater mass have proportionately larger skulls. This pattern stands in marked contrast to that for other vertebrate herbivores, in which larger−bodied species either have proportionately similar or smaller skulls relative to body mass. Larger−bodied ceratopsians evolved skulls that are 50% or more of trunk length—as measured without their expansive cranial frill. Although contemporaneous duck−billed dinosaurs also exhibit some positive allometry in the skull, skull length remains approximately 35% of trunk length. The evolution of extraordinary absolute and relative skull size among ceratopsians appears to have been driven by sexual selection and involved the tandem evolution of reduced head mobility and an obligate quadrupedal posture.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new ankylosaurid from the Late Cretaceous Two Medicine Formation of Montana, USA
    Autorzy:
    Penkalski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/945878.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    ankylosaur
    Dinosauria
    Ornithischia
    Ankylosauridae
    systematics
    paleontology
    Campanian
    Late Cretaceous
    Cretaceous
    Two Medicine Formation
    Montana
    USA
    Opis:
    Oohkotokia horneri gen. et sp. nov. is described based on a specimen in the collections of the Museum of the Rockies, Montana, USA. Oohkotokia exhibits a unique combination of characters not seen in other late Campanian North American ankylosaurids: prominent, horn-like, trihedral squamosal bosses, a small, undistinguished median nasal plate on the dorsal surface of the rostrum, a relatively small occipital condyle, a smooth, finely pitted osteoderm external texture, and triangular lateral osteoderms. Other specimens from the Two Medicine Formation are referable to Oohkotokia. O. horneri, Euoplocephalus tutus, Dyoplosaurus acutosquameus, and Scolosaurus cutleri separate stratigraphically.
    Źródło:
    Acta Palaeontologica Polonica; 2014, 59, 3; 617-634
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evidence for a sauropod-like metacarpal configuration in stegosaurian dinosaur
    Autorzy:
    Senter, P
    Powiązania:
    https://bibliotekanauki.pl/articles/23329.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    evidence
    paleontology
    sauropod
    metacarpal configuration
    stegosaurian dinosaur
    dinosaur
    Dinosauria
    Ornithischia
    Stegosauria
    forelimb
    functional morphology
    Opis:
    The stegosaurian forelimb is usually portrayed with the metacarpals slanted and distally spread. However, manual manipulation of stegosaurian metacarpals reveals that in that configuration they do not articulate with each other nor with the rest of the forelimb. Rather, they do articulate with each other and with the rest of the forelimb when posed vertically and arranged in a compact, semi−tubular configuration, as in sauropods. This configuration agrees with data from articulated specimens and trackways. As with sauropods, this metacarpal configuration makes retention of phalanges awkward for locomotion and may be functionally related to the vestigiality of the manual phalanges of the outer digits.
    Źródło:
    Acta Palaeontologica Polonica; 2010, 55, 3; 427-432
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The phylogenetic position of the ornithischian dinosaur Stenopelix valdensis from the Lower Cretaceous of Germany and the early fossil record of Pachycephalosauria
    Autorzy:
    Butler, R J
    Sullivan, R.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21353.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cretaceous
    Dinosauria
    ornithischian dinosaur
    fossil
    paleontology
    Pachycephalosauria
    Ornithischia
    Germany
    phylogenetic position
    Marginocephalia
    Lower Cretaceous
    dinosaur
    Stenopelix valdensis
    Opis:
    The holotype of Stenopelix valdensis is the most completely known dinosaur specimen from the “Wealden” (Lower Cretaceous) of northwestern Germany, but its phylogenetic position has remained highly controversial. Most recent authors have suggested affinities with the ornithischian clade Marginocephalia, and most commonly to the marginocephalian subclade Pachycephalosauria. A pachycephalosaurian identity would make Stenopelix the only confirmed pre−Late Cretaceous member of this clade, breaking up an extensive ghost lineage which extends to the inferred origin of Pachycephalosauria in the Middle–Late Jurassic. Based upon re−examination of the holotype we here review the characters that have previously been used to assign Stenopelix to either Pachycephalosauria or Ceratopsia. All of these characters are problematic, being based upon inaccurate anatomical interpretations, or having more widespread distributions within Ornithischia than previously realised. We conclude that although the overall anatomy of Stenopelix is consistent with marginocephalian affinities, there is insufficient evidence to support referral to either Pachycephalosauria or Ceratopsia; we consider Stenopelix ?Marginocephalia. A brief review indicates that there is no compelling fossil evidence for pachycephalosaurs prior to the Late Cretaceous.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 1; 21-34
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hadrosaurs as ungulate parallels: lost life styles and deficient data
    Dinozaury kaczodziobe jako ekologiczne odpowiedniki ssakow kopytnych: wygasle tryby zycia a niepelne dane
    Autorzy:
    Carrano, M T
    Janis, C M
    Powiązania:
    https://bibliotekanauki.pl/articles/23129.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Azja
    Hadrosauridae
    zeby
    podobienstwo morfologiczne
    Ameryka Polnocna
    kreda
    Ornithischia
    cechy morfologiczne
    szkielet
    paleontologia
    ssaki kopytne
    dinozaury kaczodziobe
    Opis:
    Hadrosaur dinosaurs (Ornithischia: Hadrosauridae) were abundant in Late Cretaceous terrestrial environments of North America and Asia. Their derived dental and postcranial specializations for herbivory have led to the suggestion that these dinosaurs were analogous to modern ungulates in lifestyle. Ungulates display a suite of morphological features that are correlated with diet, habitat preference, and sexual dimorphism. In this paper we examine several of these same features in hadrosaurs in order to determine whether they display similar patterns under multivariate analysis. Initial results confirm the resemblances between hadrosaurs and ungulates but suggest that missing data may considerably affect the outcomes of statistical analyses. Using the hadrosaur dataset as a template, we artificially degrade the (previously complete) ungulate datasets and perform the same analyses. Results are consistent with earlier results and provide an opportunity to assess the impact of missing data on the original multivariate structure. Our results support the hypothesis that hadrosaurs were similar to ungulates in patterns of ecomorphology.
    Dinozaury kaczodziobe (Ornithischia: Hadrosauridae) były w późnej kredzie pospolite w Ameryce Północnej i Azji. Wyspecjalizowane przystosowania uzębienia i szkieletu pozaczaszkowego pozwoliły wysunąć przypuszczenie, że trybem życia przypominały dzisiejsze ssaki kopytne. Kopytne przejawiają zespół cech morfologicznych skorelowanych z rodzajem pokarmu, preferencjami siedliskowymi i dymorfizmem płciowym. W niniejszej pracy poddano analizie wieloczynnikowej odnośne cechy hadrozaurów, by sprawdzić, czy i u nich występują podobne prawidłowości. Wstępne wyniki potwierdziły podobieństwa między hadrozaurami a kopytnymi, ale wynik analizy statystycznej mógł zostać znacząco zniekształcony przez niekompletność danych dotyczących dinozaurów. Dlatego zestawy danych dotyczące ssaków kopytnych (pierwotnie kompletne) zostały sztucznie zubożone na wzór danych kopalnych i poddane powtórnej analizie. Uzyskane wyniki okazały się zbieżne z rezultatami wstępnymi i pozwoliły oszacować wpływ brakujących danych na pierwotną strukturę wieloczynnikową. Nasza analiza wspiera hipotezę, że hadrozaury były podobne pod względem ekomorfologicznym do ssaków kopytnych.
    Źródło:
    Acta Palaeontologica Polonica; 1999, 44, 3; 237-261
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Osteology and relationships of Olorotitan arharensis, a hollow−crested hadrosaurid dinosaur from the latest Cretaceous of Far Eastern Russia
    Autorzy:
    Godefroit, P.
    Bolotsky, Y.L.
    Bolotsky, I.Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/20406.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    osteology
    relationship
    Olorotitan arharensis
    dinosaur
    hadrosaurid dinosaur
    Cretaceous
    Russia
    Dinosauria
    Ornithischia
    Hadrosauridae
    Lambeosaurinae
    phylogenesis
    Late Cretaceous
    Maastrichtian Udurchukan Formation
    Corythosaurus casuarius Hypacrosaurus stebingeri
    Hypacrosaurus altispinus
    Opis:
    The holotype of Olorotitan arharensis from the Maastrichtian Udurchukan Formation in Kundur, Far Eastern Russia, is the most complete dinosaur discovered in Russia and one of the best preserved lambeosaurines outside western North America. This taxon is diagnosed by following autapomorphies: large helmet−like hollow crest higher than the rest of the skull and extending caudally well beyond the level of the occiput; very high postorbital process of jugal (ratio height of postorbital process/length of jugal = 1); rostral portion of the jugal shorter than in other lambeosaurines, with a perfectly straight rostral margin; very asymmetrical maxilla in lateral view, with ventral margin distinctly downturned; very elongated neck composed of 18 cervical vertebrae; tibia as high as the femur; shorter cnemial crest, about one fifth of tibia length. A phylogenetic analysis, based on 118 cranial, dental, and postcranial characters, indicates that Olorotitan is a member of the Corythosaurini clade, and is the sister taxon of Corythosaurus casuarius, Hypacrosaurus stebingeri, and Hypacrosaurus altispinus. The high diversity and mosaic distribution of Maastrichtian hadrosaurid faunas in the Amur−Heilongjiang region are the result of a complex palaeogeographical history and imply that many independent hadrosaurid lineages dispersed readily between western America and eastern Asia at the end of the Cretaceous.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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