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    Wyświetlanie 1-7 z 7
    Tytuł:
    Enrolment in a Middle Ordovician agnostoid trilobite
    Autorzy:
    Bruton, D L
    Nakrem, H.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/22605.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    trilobite
    Trilobita
    preservation
    Agnostida
    Middle Ordovician
    Virginia
    Ordovician
    agnostoid trilobite
    Edinburg Formation
    life habit
    Trinodus elspethi
    paleontology
    Opis:
    Study of silicified material of Trinodus elspethi, from the Edinburg Formation, Virginia, USA, shows there is no gliding of distal parts of segments but an articulating furrow and opposing flange with prongs, acting as apodemes for muscle attachment, allowed cephalon and thorax to move as a single unit. Articulation between thorax and pygidium was more rigid with prongs from the thorax articulating in sockets on the pygidium. Support is given to the view that agnostoids lived partially enrolled with cephalon and pygidium gaping. They are unique in lacking an articulating half−ring between cephalon and thorax and the hinge joint is modified medially to provide an opening for what is interpreted as an exhalatory organ through which water passed during feeding and swimming. Peculiarities of the thorax are connected with the presence of only two thoracic segments articulating as a unit with distal tips directed anteriorly rather than posteriorly. Otherwise articulating half rings are present in the rest of the thorax and pygidium and lack of articulating facets is not unique. It is concluded that agnostoids can be shown to be trilobites.
    Źródło:
    Acta Palaeontologica Polonica; 2005, 50, 3
    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:
    New location of the well-known Ordovician trilobite Asaphus expansus (Wahlenberg, 1821) from north-western Poland
    Autorzy:
    Borowski, Tomasz
    Daniszewski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1031283.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Asaphus expansus
    Ordovician
    Paleozoic
    Wahlenberg
    north-western Poland
    trilobite
    Opis:
    This report documents the new location of the representative Ordovician trilobite Asaphus expansus. This well-known trilobite was discovered in the “Storkowo” Mining Plant in the central part of the West Pomeranian Province in Poland.
    Źródło:
    World News of Natural Sciences; 2021, 34; 82-87
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New genus of dimeropygid trilobites from the earliest Ordovician of Laurentia
    Autorzy:
    Adrain, J.M.
    Westrop, S.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/21221.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Dimeropygidae
    Hystricuridae
    Ordovician
    silicified fossil
    Trilobita
    dimeropygid trilobite
    new genus
    paleontology
    trilobite
    fossil
    Ibexian
    locality
    stratigraphy
    ecology
    systematics
    Opis:
    The new genus Tulepyge includes a type species, T. tulensis nov., from the Barn Canyon Member of the House Formation, western Utah, USA, and T. paucituberculata from the Broom Point Member of the Green Point Formation, western Newfoundland, Canada. Both species are earliest Ordovician in age, with occurrence immediately above the Cambrian–Ordovician boundary. Together with the hystricurid taxon Millardicurus, the new genus is likely to serve as an indicator fossil for the Cambrian–Ordovician boundary in Laurentia, as it is already known from different biofacies on opposite margins of the continent. Tulepyge is not closely comparable with contemporaneous taxa assigned to Hystricuridae but in its dorsally convex and coarsely tuberculate exoskeleton it resembles taxa which have been referred to Dimeropygidae, most of which are considerably younger in age.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pellets independent of or associated with Bohemian Ordovician body fossils
    Autorzy:
    Bruthansova, J
    Kraft, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/23505.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    trilobite
    Bohemia
    Ordovician
    Pricyclopyge binodosa
    paleoecology
    small cylindrical pellet
    paleontology
    pellet
    Parabarrandia crassa
    Ormathops atavus
    body fossil
    Opis:
    Clusters of small cylindrical pellets occur sporadically in Ordovician strata in Bohemia. They are assigned to the ichnogenus Tomaculum and occur in lenticular or elongated accumulations. Similar accumulations are associated with body fossils including the cephala of the trilobites Ormathops atavus, Pricyclopyge binodosa, and Parabarrandia crassa. The clusters are situated under the glabella and in the anterior parts of the cephalon but their exact position is variable in different cases. Accumulations of pellets have also been studied inside shells of hyoliths, bellerophontids, and echinoderm thecae. They probably represent the faeces of either scavengers feeding on soft parts or organisms using cephalic shields and other shells as hiding places. An interpretation of these pellets as trilobite eggs is highly improbable.
    Źródło:
    Acta Palaeontologica Polonica; 2003, 48, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First report on the occurrence of Neseuretinus and Ovalocephalus trilobites in the Middle Ordovician of Iran
    Autorzy:
    Ghobadi, Pour M
    Popov, L.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/21343.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    trilobite
    taxonomy
    Trilobita
    paleontology
    Shirgesht Formation
    Ovalocephalus
    Neseuretinus
    Ordovician
    paleobiogeography
    Middle Ordovician
    Iran
    Opis:
    In the Derenjal Mountains of east Central Iran, the upper part of the Shirgesht Formation (uppermost Darriwilian) contains a distinct trilobite assemblage that includes Neseuretinus birmanicus and Ovalocephalus aff. obsoletus among others. Both genera were previously unknown in Iran. The occurrence of Ovalocephalus represents the earliest sign of westward taxon migration from China towards higher latitudes along the West Gondwanan margin, which may be related to global warming, after a short episode of cooler climate in the early to mid Darriwilian. Patterns of biogeographical distribution of Ovalocephalus and Neseuretinussuggest that Central Iran was part of an “overlap zone” where tropical and high latitude benthic taxa mingled.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 1; 125-133
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ordovician ostracods from East Central Iran
    Autorzy:
    Ghobadi Pour, M.
    Williams, M.
    Vannier, J.
    Meidla, T.
    Popov, L.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/22059.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    geographic setting
    Iran
    Ordovician
    Ostracoda
    Shirgesht Formation
    brachiopod
    geological setting
    ostracod
    paleontology
    trilobite
    systematics
    ostracod fauna
    biogeography
    stratigraphy
    Opis:
    Ordovician ostracods are described for the first time from Iran, enhancing the record of this group from the Lower Palaeozoic of the Middle East. The ostracods occur in the Shirgesht Formation, in the east central part of the country, and comprise Ogmoopsis achaemenid sp. nov., Cerninella aryana sp. nov., Ordovizona amyitisae sp. nov., cf. Aechmina? ventadorni, Vogdesella sp., and podocope taxa tentatively identified as species of Longiscula, Pullvillites, and Rectella. These taxa were hitherto unknown from this region. The ostracod−bearing interval is associated with trilobites (Neseuretinus) and brachiopods (Nicolella) that suggest a late Middle Ordovician age. Although the ostracod fauna is small, it demonstrates biogeographical links at genus−level, and possibly at species−level, with the fauna of the late Middle Ordovician Travesout Formation of western France, which also lay in a peri−Gondwanan palaeogeographical setting. It also suggests the potential use of some ostracods as stratigraphical tools for correlating Ordovician rock successions between Europe and the Middle East.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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