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    Wyświetlanie 1-3 z 3
    Tytuł:
    Phylogeny and evolutionary stages of Dinosauria
    Autorzy:
    Xijin, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/23376.pdf
    Data publikacji:
    1983
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    New suggestions are offered concerning the phylogeny of the dinosaurs, based on the Chinese materials as well as those from other parts of the world. The two dinosaur orders, Saurischia and Ornithischia, differed in tempo of evolution. The Saurischia include four evolutionary branches (Plateosauria, Sauropoda, Coelurosauria, Carnosauria) originating from different pseudosuchians in the Late Triassic, most of which extend to the Late Cretaceous. Ornithischia also evolved from different pseudosuchians in the Late Triassic and include three evolutionary branches: Ornithopoda, Pachycephalosauria and Armatosauria n. suborder. Four main stages can be distinguished in the evolution of all dinosaurs. Within Ornithischia one new suborder Armatosauria is erected and eight new superfamilies: Tianchungosauroidea, Chaoyoungosauroidea, Psittacosauroidea, Pachycephalosauroidea, Scelidosauroidea, Stegosauroidea, Oligosacralosauroidea and Polysacralosauroidea are introduced.
    Źródło:
    Acta Palaeontologica Polonica; 1983, 28, 1-2
    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:
    Mud-trapped herd captures evidence of distinctive dinosaur sociality
    Autorzy:
    Varricchio, D.J.
    Sereno, P.C.
    Xijin, Z.
    Lin, T.
    Wilson, J.A.
    Lyon, G.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/20502.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cretaceous
    dinosaur
    sociality
    Dinosauria
    Ornithomimosauria
    taphonomy
    drought
    Sinornithomimus dongi
    paleontology
    fossil assemblage
    Opis:
    A unique dinosaur assemblage from the Cretaceous beds of western Inner Mongolia preserves geologic and paleontologic data that clearly delineate both the timing and mechanism of death. Over twenty individuals of the ornithomimid Sinornithomimus dongi perished while trapped in the mud of a drying lake or pond, the proximity and alignment of the mired skeletons indicating a catastrophic mass mortality of a social group. Histologic examination reveals the group to consist entirely of immature individuals between one and seven years of age, with no hatchlings or mature individuals. The Sinornithomimus locality supports the interpretation of other, more taphonomically ambiguous assemblages of immature dinosaurs as reflective of juvenile sociality. Adults of various nonavian dinosaurs are known to have engaged in prolonged nesting and post hatching parental care, a life history strategy that implies juveniles spent considerable time away from reproductively active adults. Herding of juveniles, here documented in a Cretaceous ornithomimid, may have been a common life history strategy among nonavian dinosaurs reflecting their oviparity, extensive parental care, and multi−year maturation.
    Źródło:
    Acta Palaeontologica Polonica; 2008, 53, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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