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    Wyświetlanie 1-7 z 7
    Tytuł:
    Maximizing diductor adhension: An unusual cardinal process in Late Ordovician brachiopods from Estonia
    Autorzy:
    Hints, L
    Powiązania:
    https://bibliotekanauki.pl/articles/23270.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    brachiopod
    orthoidean brachiopod
    Ordovician
    Late Ordovician
    paleontology
    Estonia
    Opis:
    Cardinal process is a structure on dorsal valve of brachiopods serving for separation or attachment of diductor muscles. A cardinal process with a peculiar folded myophore is described from Late Ordovician “Orthis” kukersiana−group brachiopods assigned to the genus Cyrtonotella (order Orthida). This structure differs from those of other rhynchonelliformean brachiopods and can be considered as a separate type among about twenty varieties of processes described up to now.
    Źródło:
    Acta Palaeontologica Polonica; 2004, 49, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Ordovician brachiopods from the Selety River basin, North Central Kazakhstan
    Autorzy:
    Nikitin, I F
    Popov, L.E.
    Bassett, M.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/22739.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    brachiopod
    Ordovician
    Late Ordovician
    biogeography
    Selety River
    taxonomy
    Kazakhstan
    Brachiopoda
    paleontology
    Opis:
    A medium−diversity fauna of late Ordovician rhynchonelliformean brachiopods occurs in the Tauken Formation (upper Caradoc–lowermost Ashgill) of north Central Kazakhstan.It demonstrates close similarity to the approximately contemporaneous faunas characteristic of shallow clastic shelves (BA 2–3) of the Chingiz and Chu−Ili ranges (both in Kazakhstan) and South China, but is characterized by a high proportion of endemic new species, including Tetraphalerella bestiubensis sp.nov., Glyptomena kaskolica sp.nov., Dinorthis taukensis sp.nov., Rhynchotrema seletensis sp.nov., and Nalivkinia (Pronalivkinia)zvontsovisp.nov.The abundance of Rhynchotrema is somewhat unusual by comparison with faunas from other Kazakhstanian terranes, where rhynchonellides of the family Ancistrorhynchidae are usually dominant in near−shore biofacies.The occurrence of the atrypides Sulcatospira and early Nalivkinia demonstrates a clear biogeographical linkage with approximately contemporaneous faunas of South China.
    Źródło:
    Acta Palaeontologica Polonica; 2003, 48, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alleged cnidarian Sphenothallus in the Late Ordovician of Baltica, its mineral composition and microstructure
    Autorzy:
    Vinn, O.
    Kirsimae, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/21175.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    alleged cnidarian
    cnidarian
    Sphenothallus
    Late Ordovician
    Ordovician
    Sandbian
    Katian
    mineral composition
    microstructure
    Estonia
    Opis:
    Sphenothallus is a problematic fossil with possible cnidarian affinities. Two species of Sphenothallus, S. aff. longissimus and S. kukersianus, occur in the normal marine sediments of the Late Ordovician of Estonia. S. longissimus is more common than S. kukersianus and has a range from early Sandbian to middle Katian. Sphenothallus had a wide paleo-biogeographic distribution in the Late Ordovician. The tubes of Sphenothallus are composed of lamellae with a homogeneous microstructure. The homogeneous microstructure could represent a diagenetic fabric, based on the similarity to diagenetic structures in Torellella (Cnidaria?, Hyolithelminthes). Tubes of Sphenothallus have an apatitic composition, but one tube contains lamellae of diagenetic calcite within the apatitic structure. Sphenothallus presumably had originally biomineralized apatitic tubes. Different lattice parameters of the apatite indicate that biomineralization systems of phosphatic cnidarians Sphenothallus and Conularia sp. may have been different.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revision of the late Ordovician trilobite Holotrachelus punctillosus [Tornquist, 1884] from Dalarna, Sweden
    Autorzy:
    Suzuki, Y
    Powiązania:
    https://bibliotekanauki.pl/articles/20129.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    trilobite
    Cheiruridae
    Trilobita
    Sphaerexochinae
    late Ordovician
    Sweden
    Proetida
    Ordovician
    Holotrachelus
    Boda Limestone
    Holotrachelus punctillosus
    Opis:
    Holotrachelus punctillosus from the Boda Limestone (Ashgill, Upper Ordovician) of Sweden is redescribed. The systematic position of this problematic species is discussed. Its distinctive morphology appears to be the result of an adaptation towards illaenid life habits. The pygidial morphology, with the extra-fulcral field developed as segmental pleural spines, makes an assignment possible to only four Ordovician groups, namely the Remopleuridioidea, Odontopleuroidea, Lichoidea and Cheiruroidea. Of these, the former three are so different that a direct affiliation is out of the question. Similarities with the Cheiruroidea are the more persuasive, particularly after a misinterpretation of the facial suture is corrected and some other problems are sorted out. It is suggested that the Holotrachelinae are placed within the Cheiruridae, where it may have special affinities to the Sphaerexochinae.
    W pracy przedstawiono redeskrypcję trylobita Holotrachelus punctillosus, pochodzącego ze szwedzkich wapieni Boda (aszgil, górny ordowik) i omówiono pozycję systematyczną tego problematycznego gatunku. Jego charakterystyczna morfologia wydaje sie być związana z przystosowaniem do trybu zycia typowego dla Illaenidae. Morfologia pygidium, z polem pozawidełkowym rozwiniętym w postaci członowanych kolców pleuralnych, umożliwia zaliczenie holotrachelusa do jednej z czterech ordowickich nadrodzin: Remopleuridioidea, Odontopleuroidea, Lichoidea lub Cheiruroidea. Holotrachelus wykazuje najwieksze podobieństwo do Cheiruroidea, zwłaszcza po skorygowaniu mylnej interpretacji szwu policzkowego. Autor sugeruje, że Holotrachelinae należy umieścić w obrębie Cheiruridae, przy czym najbliższe pokrewieństwa mogą je łączyć ze Sphaerexochinae.
    Źródło:
    Acta Palaeontologica Polonica; 2001, 46, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concentration of juvenile and small cephalopods in the Hirnantian cherts [Late Ordovician] of Porkuni, Estonia
    Autorzy:
    Kroger, B
    Powiązania:
    https://bibliotekanauki.pl/articles/20351.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    juvenile cephalopod
    Cephalopoda
    Nautiloidea
    small adult cephalopod
    cephalopod
    Late Ordovician
    Ordovician
    life mode
    Porkuni village
    paleontology
    Estonia
    Opis:
    The quarry in the north Estonian village of Porkuni provides a succession of shallow−water limestones and cherts spanning the Ashgillian Normalograptus? extraordinarius graptolite Biozone. This interval comprises the initial pulse of the end−Ordovician extinction. The succession of Porkuni contains abundant and extraordinarily well−preserved fossils. 71 cephalopod specimens were extracted from these strata at Porkuni. Many of these specimens are fragments of juvenile shells or small adults. The embryonic shells of the cephalopods are usually preserved and provide insight into their early ontogeny. The faunal composition is considered as autochthonous and reflects a “palaeo−nursery” in a Hirnantian reef environment. The collected specimens represent twelve genera and four orders. Small oncoceridans and orthoceridans dominate the association. The rate of endemism is very high, since only two genera found in Porkuni, are known from outside Baltoscandia. The new genera Parvihebetoceras, Pomerantsoceras, Porkunioceras, and the new species Parvihebetoceras wahli, Pomerantsoceras tibia, Porkunioceras tuba, and Strandoceras orvikui are erected.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A revision of the Late Ordovician marrellomorph arthropod Furca bohemica from Czech Republic
    Autorzy:
    Rak, S.
    Ortega-Hernandez, J.
    Legg, D.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/21109.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Late Ordovician
    marrellomorph arthropod
    arthropod
    Furca bohemica
    Czech Republic
    Arthropoda
    Marrella
    Mimetaster
    Letna Formation
    Barrandian
    Ordovician
    Ostry Hill
    Opis:
    The enigmatic marrellomorph arthropod Furca bohemica from the Upper Ordovician Letná Formation, is redescribed. Based on existing museum specimens and new material collected from the southern slope of Ostrý Hill (Beroun, Czech Republic), the morphology and taphonomy of F. bohemica is reappraised and expanded to produce a new anatomical interpretation. The previously distinct taxa F. pilosa and Furca sp., are synonymised with F. bohemica, the latter being represented by a tapho−series in which decay has obscured some of the diagnostic features. A cladistic analysis indicates close affinities between F. bohemica and the Hunsrück Slate marrellomorph Mimetaster hexagonalis, together forming the Family Mimetasteridae, contrary to previous models for marrellomorph internal relationships. As with other representatives of the group, the overall anatomy of F. bohemica is consistent with a benthic, or possibly nektobenthic, mode of life. The depositional setting of the Letná Formation indicates that F. bohemica inhabited a shallow marine environment, distinguishing it palaeoecologically from all other known marrellomorphs, which have been reported from the continental shelf.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentological record of changing hydrodynamic conditions in the upper Tremadoc deposits of the Holy Cross Mountains, Poland
    Autorzy:
    Trela, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059262.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Holy Cross Mountains
    Ordovician
    Late Tremadoc
    chalcedonites
    transgression
    storm deposits
    Opis:
    In the upper Tremadoc, in the Kielce region of the Holy Cross Mountains, siltstones and fine-grained sandstones are interbedded with chalcedonites and claystones. The deposits were probably laid down when the late Tremadoc transgression reached its maximum. Storm currents influenced deposition at times while, during calm periods, sedimentation of chalcedonites, clayey cherts and clays took place. Weak bottom currents affected the deposition of siliceous layers. The deposits accumulated on a distal shelf.
    Źródło:
    Geological Quarterly; 2001, 45, 2; 131-142
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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