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    Wyświetlanie 1-5 z 5
    Tytuł:
    New occurrence of the Ordovician eocrinoid cardiocystites: Palaeogeographical and palaeoecological implications
    Autorzy:
    Nardin, E
    Powiązania:
    https://bibliotekanauki.pl/articles/19986.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    occurrence
    Morocco
    taxonomy
    paleobiogeography
    Cardiocystites
    fossil record
    Gondwana
    Blastozoa
    Ordovician
    eocrinoid
    paleoecology
    Eocrinoidea
    paleontology
    Opis:
    Flattened eocrinoids are very rare in the fossil record, notably because of their fragility. Recent investigations in the Anti−Atlas (Morocco) have provided one of the oldest known specimens of Cardiocystites from the Upper Ordovician (early–middle Sandbian). This discovery increases the number of eocrinoid genera known in Morocco. This new material is the fifth published specimen of the genus Cardiocystites. It is well preserved, thus allowing morphological details, such as the location of the anal pyramid and the plane of thecal flattening, to be observed. Palaeoecological reconstruction can be deduced or confirmed from these new details. The respiration of Cardiocystites now seems due to the combination of both epidermal gaseous exchange and cloacal pumping. Stem length and synostosial articulation indicate that the stem might have been used as a mooring line allowing the theca to float in the currents. The flattening of the Cardiocystites theca seems to be an adaptation to high energy hydrodynamic conditions and cold waters. Occurrences of Cardiocystites bohemicusin Morocco, in the early–middle Sandbian, and in Bohemia, in the early Katian, indicate that the genus probably originated in the west Gondwanan margin. Migration could explain the occurrence of Cardiocystites in this area and also in Avalonia in the late Sandbian. The global sea−level rise and the presence of cool water circulation from west Gondwana to Avalonia and Laurentia in the early Sandbian favour such a hypothesis.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Cretaceous mammal from Tanzania
    Autorzy:
    Krause, D W
    Gottfried, M.D.
    O'Connor, P.M.
    Roberts, E.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/23042.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    mammal
    Gondwana
    Cretaceous
    Mammalia
    Africa
    Tanzania
    Gondwanatheria
    paleontology
    Opis:
    We report here the discovery of a Cretaceous mammal from the “Red Sandstone Group” of southwestern Tanzania. This specimen is one of only a very few Cretaceous mammals known from Gondwana in general and Africa in particular. The specimen consists of a short, deep left dentary that bore a large, procumbent central incisor, and five single−rooted, hypsodont cheek−teeth. The specimen is very tentatively identified as a sudamericid, and thus may represent the first African record of an enigmatic clade of mammals, the Gondwanatheria, which is otherwise known from the Late Cretaceous and Paleogene of several other Gondwanan landmasses. Unfortunately, the precise age of the specimen could not be determined. If it is pre−Campanian and if its identity as a sudamercid is corroborated through subsequent discoveries, it represents the earliest known gondwanatherian. If the specimen is from the Campanian or Maastrichtian, and again assuming its identification is correct, it has the potential to refute a recently formulated biogeographic hypothesis predicting the absence of certain terrestrial and freshwater vertebrate taxa, including gondwanatherians, in Africa (i.e., those that evolved elsewhere on Gondwana after Africa became an isolated landmass).
    Źródło:
    Acta Palaeontologica Polonica; 2003, 48, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Late Cretaceous mammals from the Intertrappean beds of Rangapur, India and paleobiogeographic framework
    Autorzy:
    Rana, R S
    Wilson, G.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/21414.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Eutheria
    mammal
    Gondwana
    Cretaceous
    Late Cretaceous
    tooth
    Intertrappean bed
    biogeography
    India
    Rangapur
    paleobiogeography
    paleontology
    Opis:
    A new mammal−bearing locality from the Intertrappean beds (Maastricthian) of Rangapur, Andhra Pradesh, India provides isolated teeth referable to Deccanolestes and a new eutherian, Sahnitherium rangapurensis. Dental comparisons with Cimolestes, Procerberus, and Aboletylestes do not support proposed “palaeoryctoid” affinities for Deccanolestes. Although similarities exist with Otlestes and Batodon, Deccanolestes is currently considered to be of uncertain familial affinities. Sahnitherium rangapurensis exhibits similarities to Procerberus, Paranyctoides, Alostera, Aboletylestes, and Avitotherium, but it is here placed within Eutheria incertae sedis. Despite family level taxonomic uncertainties, the new material confirms the presence of eutherians on the Indian subcontinent during the Late Cretaceous. A Eurasian connection via an early collision or some other dispersal route may explain these paleobiogeographic data, but other hypotheses are considered. In particular, paleogeographic, paleontological, and molecular systematic data hint that boreosphenidan mammals may have had wider distribution on Gondwana during the Cretaceous than previously supported.
    Źródło:
    Acta Palaeontologica Polonica; 2003, 48, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New data on the Paleocene monotreme Monotrematum sudamericanum, and the convergent evolution of triangulate molars
    Autorzy:
    Pascual, R
    Goin, F.J.
    Balarino, L.
    Udrizar Sauthier, D.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/21782.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Monotremata
    molar
    Paleocene
    Gondwana
    triangulate molar
    Monotrematum sudamericanum
    monotreme
    molar structure
    evolution
    Patagonia
    paleontology
    Opis:
    We describe an additional fragmentary upper molar and the first lower molar known of Monotrematum sudamericanum, the oldest Cenozoic (Paleocene) monotreme. Comparisons suggest that the monotreme evolution passed through a stage in which their molars were “pseudo−triangulate”, without a true trigonid, and that the monotreme pseudo−triangulate pattern did not arise through rotation of the primary molar cusps. Monotreme lower molars lack a talonid, and consequently there is no basin with facets produced by the wearing action of a “protocone”; a cristid obliqua connecting the “talonid“ to the “trigonid” is also absent. We hypothesize that acquisition of the molar pattern seen in Steropodon galmani (Early Cretaceous, Albian) followed a process similar to that already postulated for docodonts (Docodon in Laurasia, Reigitherium in the South American sector of Gondwana) and, probably, in the gondwanathere Ferugliotherium.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Australian multituberculate and its palaeobiogeographic implications
    Autorzy:
    Rich, T H
    Vickers-Rich, P.
    Flannery, T.F.
    Kear, B.P.
    Cantrill, D.J.
    Komarower, P.
    Kool, L.
    Pickering, D.
    Trusler, P.
    Morton, S.
    Van Klaveren, N.
    Fitzgerald, E.M.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/22948.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Corriebaatar marywaltersae
    Cretaceous
    new species
    multituberculate
    Gondwana
    fossil
    paleontology
    new genus
    Australia
    Multituberculata
    Cimolodonta
    Mammalia
    Opis:
    A dentary fragment containing a tiny left plagiaulacoid fourth lower premolar from the Early Cretaceous (Aptian) of Victoria provides the first evidence of the Multituberculata from Australia. This unique specimen represents a new genus and species, Corriebaatar marywaltersae, and is placed in a new family, Corriebaataridae. The Australian fossil, together with meagre records of multituberculates from South America, Africa, and Madagascar, reinforces the view that Multituberculata had a cosmopolitan distribution during the Mesozoic, with dispersal into eastern Gondwana probably occurring prior to enforcement of climatic barriers (indicated by marked differentiation in regional floras) in the Early Cretaceous.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 1; 1-6
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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