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    Wyświetlanie 1-5 z 5
    Tytuł:
    A new family of ceraphronoid wasps from Early Cretaceous Alava Amber, Spain
    Autorzy:
    Ortega-Blanco, J
    Rasnitsyn, A.P.
    Delclos, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/21882.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Radiophronidae, a new ceraphronoid fossil family including two new genera and species, is described here from the Early Cretaceous (Albian) amber from the Basque Cantabrian Basin (Spain). Radiophron ibericus gen. et sp. nov. and Microcostaphron parvus gen. et sp. nov. are described from eight and one specimens respectively. The new fossils show some similarities with the extinct family Stigmaphronidae but are distinguished from it and the extant ceraphronoids mainly by the presence of not fused radial and costal veins, among other characteristics. A first cladistic analysis retrieves Radiophronidae as the basal sister−group to all other ceraphronoids (Ceraphronidae, Megaspilidae, and Stigmaphronidae).
    Źródło:
    Acta Palaeontologica Polonica; 2010, 55, 2; 265-276
    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:
    Speeds of dinosaurs from the Albian-Cenomanian of Patagonia and sauropod stance and gait
    Autorzy:
    Mazzetta, G V
    Blanco, R E
    Powiązania:
    https://bibliotekanauki.pl/articles/20359.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleoichnology
    dinosaur speed
    Rio Limay Formation
    gait
    Patagonia
    dinosaur
    sauropod stance
    Opis:
    Estimates of locomotory speeds of small to large-sized Patagonian dinosaurs are presented for the first time. These estimates are inferred from trackways found on fine to coarse-grained brown sandstones located in the lower section of the Candeleros Member of the Río Limay Formation (Albian-Cenomanian), Neuquén Province, Argentina. The method used is based on the measurement of the stride length (distance between two successive prints of the same foot) and of the length of the hindfoot print, which in turn, allows us to estimate the height at the hip joint and, therefore, the approximate size of the animal. The hypothesis of dynamic similarity implies that the movements of geometrically similar animals, although of different sizes, are dynamically similar only when they move with the same Froude number. The dynamically similar movements (i.e., those with equal Froude number) require equal values of relative stride length (ratio between the stride length and the hip joint height). The relationship between the relative stride length and the Froude number allows us to estimate the speeds of dinosaurs. The dinosaurian ichnofauna studied reveals low speeds that range from 0.5 to 2.6 m s⁻¹. Our analyses show that the sauropods responsible for these trackways were either walking very slowly in a bipedal stance or alternatively they were progressing quadrupedally on a slippery surface.
    Źródło:
    Acta Palaeontologica Polonica; 2001, 46, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recurrent Constructional Pattern of the Crustacean Burrow Sinusichnus sinuosus from the Paleogene and Neogene of Spain
    Autorzy:
    Belaustegui, Z.
    de Gibert, J.M.
    Lopez-Blanco, M.
    Bajo, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/946033.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    decapoda
    sinusichnus sinuosus
    bioturbation
    eocene
    miocene
    pliocene
    Opis:
    New occurrences of Sinusichnus sinuosus described in the Cenozoic of Spain evidence the almost continuous fossil record of this ichnospecies from the Upper Cretaceous to the Lower Pliocene. Morphological and size features of these highly regular sinusoidal burrows have been analyzed, showing a very recurrent constructional pattern through time. Such features are also constant along the ontogeny of the producer. The large number of similarities that this ichnogenus shares with fodinichnial burrow systems, such as Thalassinoides, Ophiomorpha, or Spongeliomorpha, point to a crustacean authorship. Since this sinusoidal architecture is also common among some graphoglyptids, other behavioral strategies are discussed. The ichnogenus Sinusichnus occurs commonly in shallow marine environments, in particular to deltaic depositional settings.
    Źródło:
    Acta Palaeontologica Polonica; 2014, 59, 2; 461-474
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Large theropod dinosaur footprint associations in western Gondwana: Behavioural and palaeogeographic implications
    Autorzy:
    Moreno, K.
    de Valais, S.
    Blanco, N.
    Tomlinson, A.J.
    Jacay, J.
    Calvo, J.O.
    Powiązania:
    https://bibliotekanauki.pl/articles/22773.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    large theropod dinosaur
    theropod dinosaur
    footprint
    Gondwana
    Theropoda
    behaviour
    paleogeography
    Early Cretaceous
    Cretaceous
    Chile
    Peru
    Opis:
    In modern terrestrial ecosystems, the population size of large predators is low, and a similar pattern has usually been assumed for dinosaurs. However, fossil finds of monospecific, large theropod accumulations suggest that population dynamics were more complex. Here, we report two Early Cretaceous tracksites dominated by large theropod footprints, in Querulpa Chico (Peru) and Chacarilla (Chile). The two sites correspond to distinct depositional environments—tidal basin/delta (Querulpa Chico) and meandering river (Chacarilla)—with both subject to extensive arid or semiarid palaeoclimatic conditions. Although most trackways show no preferred orientation, a clear relationship between two trackmakers is observed in one instance. This observation, coupled with the high abundance of trackways belonging to distinct large theropods, and the exclusion of tracks of other animals, suggests some degree of grouping behaviour. The presence of freshwater sources in a dry climate and perhaps social behaviour such as pair bonding may have promoted interactions between large carnivores. Further, the occurrence of these two tracksites confirms that large theropod dinosaurs, possibly spinosaurids and/or carcharodontosaurids, existed on the western margin of Gondwana as early as the earliest Cretaceous.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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