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    Wyświetlanie 1-6 z 6
    Tytuł:
    The revision of 'Cladodus' occidentalis, a Late Paleozoic ctenacanthiform shark
    Autorzy:
    Ginter, M
    Ivanov, A.
    Lebedev, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/20599.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Carboniferous
    Cladodus mirabilis
    Paleozoic
    Late Paleozoic
    Permian
    tooth
    Ctenacanthiformes
    Glikmanius occidentalis
    paleontology
    Chondrichthyes
    Opis:
    The teeth of a well known late Palaeozoic cladodont chondrichthyan, “Cladodus” occidentalis from Russia, USA, and England are restudied and a new generic name, Glikmanius gen. nov., is proposed for this species. Yet another tooth−based species, formerly described as ?Symmorium myachkovensis, occurring on the Russian Platform and in Nebraska, is considered to belong to the newly erected genus. Although there is no direct evidence that Glikmanius possessed fin spines, the broad similarity between its teeth and those of Ctenacanthus compressus suggests it had a ctenacanthiform affinity. The possible relationships between Glikmanius, Cladodus sensu stricto, “Ctenacanthus” costellatus, and Heslerodus, are suggested. However, the proposition put forward by an earlier author that the teeth of Heslerodus might represent the lower jaw dentition of G. myachkovensis, is rejected. The overall resemblance of Glikmanius teeth and those of Cladoselache and Squatinactis is recognised as convergent.
    Źródło:
    Acta Palaeontologica Polonica; 2005, 50, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Palaeozoic foliage from China displays affinities to Cycadales rather than to Bennettitales necessitating a re-evaluation of the Palaeozoic Pterophyllum species
    Autorzy:
    Pott, C.
    McLoughlin, S.
    Lindstrom, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/23351.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Late Paleozoic
    Paleozoic
    China
    Cycadales
    Bennettitales
    Pseudoctenis
    Pterophyllum
    cuticle analysis
    epidermal anatomy
    Carboniferous
    Permian
    paleontology
    Opis:
    The epidermal anatomy of Pseudoctenis samchokense is described revealing non−bennettitalean characters of these leaves from the Permo−Carboniferous of China (and Korea). The specimens were originally described as Pterophyllum samchokense suggesting a bennettitalean affinity. They can no longer be considered bennettitalean since their cuticles lack the distinctive brachyparacytic stomata of that clade. Pterophyllum was originally erected as a morphogenus for segmented leaves from the Mesozoic and has subsequently been clearly assigned to the Bennettitales. The segmented leaves from the Permo−Carboniferous of Shanxi and Hebei, China described herein require a new ordinal and generic assignment since the non−bennettitalean cuticular characters documented reinforce the uncertainties in attribution of any foliage older than Late Triassic to the Bennettitales. Based on leaf−architecture and epidermal anatomical characters, the specimens are at best assigned to the cycadalean genus Pseudoctenis. This genus was formerly known only from Mesozoic rocks. Consequently, the specimens are highly significant, as they are among the oldest known vegetative remains of cycads. Re−evaluation of the affinities of all specimens assigned to Pterophyllum from Palaeozoic rocks is thus essential. Based on a review of other Permian–Carboniferous fossil leaves assigned to Pterophyllum, we conclude that none yet reveals definitive bennettitalean characters.
    Źródło:
    Acta Palaeontologica Polonica; 2010, 55, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revision of the enigmatic insect family Anthracoptilidae enlightens the evolution of Palaeozoic stem-dictyopterans
    Autorzy:
    Guan, Z.
    Prokop, J.
    Roques, P.
    Lapeyrie, J.
    Nel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/22873.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Insecta
    Neoptera
    systematics
    Paoliida
    insect
    Anthracoptilidae
    evolution
    Paleozoic
    Carboniferous
    dictyopteran
    Opis:
    The position of the Palaeozoic Anthracoptilidae has been a major problem of insect systematics for over a century. The previous hypotheses suggested affinities of Anthracoptilidae with the Palaeodictyopteroida, Protorthoptera, Hypoperlida, stem-Mantodea, Paraneoptera, Holometabola, or Eoblattida. Herein we put forward a new hypothesis based mainly on a comprehensive re-evaluation of the wing venation characters and re-examination of the type material of Anthracoptilus perrieri and Mesoptilus dolloi. The Anthracoptilidae are considered as belonging to the paoliid lineage, sister group of the Dictyoptera. In particular this result refutes the presence of Mantodea in the Paleozoic fossil record. The two families Strephocladidae and Strephoneuridae, are considered as junior synonyms of the Anthracoptilidae, while the previous synonymy of the Anthracoptilidae with the Ischnoneuridae is rejected. We consider the Permarrhaphidae, previously considered as synonym of the Anthracoptilidae, (and Permarrhaphus) as Insecta incertae sedis. The following new taxa are proposed: Mesoptilus carpenteri sp. nov. from the early Permian of Wellington Formation in Oklahoma (USA) which extends the range and distribution of the genus; Pseudomesoptilus gen. nov. is designated to include Mesoptilus sellardsi; Strephocladus permianus sp. nov. from the middle Permian of South of France; Westphaloptilus gallicus gen. et sp. nov. from the Bashkirian of the North of France.
    Źródło:
    Acta Palaeontologica Polonica; 2016, 61, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metodyka wyznaczania zawartości substancji organicznej w utworach niższego paleozoiku i karbonu dla archiwalnych otworów wiertniczych
    Methodology for determining the organic matterc ontentin the lower Palaeozoic and Carboniferous deposits for archival boreholes
    Autorzy:
    Gąsior, I.
    Skupio, R.
    Dohnalik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075507.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    materia organiczna
    dolny paleozoik
    karbon
    CARBOLOG
    organic matter
    lower Paleozoic
    Carboniferous
    Opis:
    The aim of the study was to present the use of archival welllogs for quantitative determination of organic matter (TOC wt.% ). The study was conducted in the lower Palaeozoic rocks of the Baltic Basin and Podlasie-Lublin Basin as well as in the Carboniferous rocks of the Fore-Sudetic Homocline basement. In many wells, sonic logging has not been run at all or run to a limited extent. In such cases, a neural network method was used to estimate the interval time. Then, continuous analysis was carried out for quantitative determination of organic matter content (TOC) using the CARBOLOG method. Finally, well log interpretation was performed for six wells in the Podlasie-Lublin Basin, five wells in the Baltic Basin, and five wells in the Fore-Sudetic Homocline basement. This article presents examples of results obtained for two wells.
    Źródło:
    Przegląd Geologiczny; 2016, 64, 12; 987--994
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Taxonomic notes on Phoebodus heslerorum and Symmorium reniforme [Chondrichthyes, Elasmobranchii]
    Autorzy:
    Ginter, M
    Powiązania:
    https://bibliotekanauki.pl/articles/23345.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Carboniferous
    Symmorium reniforme
    Paleozoic
    tooth
    Elasmobranchii
    Phoebodus heslerorum
    taxonomy
    paleontology
    Chondrichthyes
    Opis:
    The revision of shark teeth from the Pennsylvanian black shales of central USA, ascribed to “Phoebodus heslerorum” Williams, 1985 and Symmorium reniforme Cope, 1893, shows that “Ph. heslerorum” is a junior synonym of “Cladodus” divergens Trautschold, 1879. This species belongs neither to Phoebodus nor to Cladodus, so a new genus Heslerodus is proposed. Very common, robust cladodont teeth with a deep labio−basal depression and two buttons, often referred to as S. reniforme, do not belong to the latter species, but to “Cladodus” occidentalis Leidy, 1859. The generic affinity of “C.” occidentalis is yet undetermined, but it is possible that it represents ctenacanthoids.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new brittle star from the early Carboniferous of Poland and its implications on Paleozoic modern-type ophiuroid systematics
    Autorzy:
    Thuy, B.
    Kutscher, M.
    Plachno, B.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/22083.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    new record
    fossil
    paleontology
    brittle star zob.ophiuroid
    ophiuroid
    Early Carboniferous
    Carboniferous
    Polska
    Paleozoic
    systematics
    Echinodermata
    Ophiuroidea
    evolution
    Tournaisian
    Opis:
    The fossil record of Paleozoic ophiuroids includes a number of forms which share striking similarities with modern relatives in terms of skeletal morphology. These so called modern-type Paleozoic ophiuroids yield an enormous potential for a better understanding of ophiuroid evolution, yet the scarcity of accurate and sufficiently detailed morphological descriptions available to date precludes any further-reaching assessments. Here, we describe an articulated ophiuroid specimen from the Late Tournaisian (early Carboniferous) of Czatkowice quarry, southern Poland, as a new species Aganaster jagiellonicus sp. nov. The good preservation of the specimen allowed for a morphological analysis at a level comparable to recent ophiuroid descriptions. It shows remarkable morphological similarities with extant former ophio-lepidids Ophiomusium and Ophiosphalma. The new find thus contributes to a solid basis for future investigations on the position of the modern-type Paleozoic ophiuroid in the phylogeny of the class.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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