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    Wyświetlanie 1-9 z 9
    Tytuł:
    The integument of Cambrian chancelloriids
    Autorzy:
    Bengtson, S
    Hou, X.
    Tematy:
    Coeloscleritophora
    Allonnia
    China
    integument
    body surface
    enigmatic organism
    sclerite
    cactus spine
    chancelloriid
    Cambrian
    paleontology
    Lower Cambrian
    Chancelloriidae
    paleozoology
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/22108.pdf  Link otwiera się w nowym oknie
    Opis:
    Details of the body surface of the chancelloriid Allonnia from the Lower Cambrian Chengjiang biota in southwestern China elucidate the nature of these enigmatic organisms. Rhombically arranged elements, about 30 x 60 ym, are interpreted as representing imbricating platelets, the distal ends of which projected as spinules from the body surface. Comparisons with other chancelloriids suggest that the flexible integument was continuous with the aragonitic sclerites that sit on the surface like cactus spines, and that both were formed by an epidermal epithelium secreting a continuous exo- and endocuticle. In the sclerites, the exocuticle was mineralized; the unmineralized endocuticle and cellular extensions from the epithelium filled the interior of the sclerites. In the flexible integument the epithelium was overlain by endocuticle and unmineralized exocuticle. This structure of soft integument and sclerites is at variance with proposals of poriferan or ascidian affinity of chancelloriids but in accord with a coeloscleritophoran model.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The tube wall of Cambrian anabaritids
    Autorzy:
    Kouchinsky, A
    Bengtson, S.
    Tematy:
    Anabaritida
    biomineralization
    recrystallization
    skeleton
    tube wall
    wall structure
    aragonite
    celestite
    barite
    Siberia
    anabaritid
    Cambrian
    paleozoology
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/22467.pdf  Link otwiera się w nowym oknie
    Opis:
    Celestite/barite−replaced and phosphate−replicated tubes of Early Cambrian anabaritids from the northern part of the Siberian Platform (Anabar Shield) give new evidence on the wall−structure of these enigmatic fossils. The walls consist of fibres, interpreted as reflecting an original aragonitic fabric. Bundles of fibres are arranged in growth lamellae, and the latter form an angle of at least 45° with the inner tube wall. Where the outer tube surface projects into annular flanges, the lamellae have a chevron−like section due to the backwards deflection of the outer parts. Anabaritids are usually referred to the Cnidaria or left without systematic assignment, but earlier suggestions included affinity to the serpulid polychaetes. The chevron structure resembles that previously exclusively known from serpulids, but the presence of internal tooth−like structures in anabaritid tubes, perhaps compromising up−and−down movement through the tubes, continue to make a direct assignment to the Serpulida questionable.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silicified and phosphatized Tianzhushania, spheroidal microfossil of possible animal origin from the Neoproterozoic of South China
    Autorzy:
    Yin, C
    Bengtson, S.
    Yue, Z.
    Tematy:
    benthic form
    China
    Tianzhushania
    phosphorite
    animal origin
    Doushantuo Formation
    Megasphaera
    Tianzhushania tuberifera
    chert
    spheroidal microfossil
    Metazoa
    Tianzhushania ornata
    Megasphaera ornata
    Neoproterozoic
    rock matrix
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/20023.pdf  Link otwiera się w nowym oknie
    Opis:
    Comparative study of microfossils from two kinds of sediments: chert intercalations (studied in thin section) and phosphorite/phosphatic carbonate (in thin section and maceration), from the upper Neoproterozoic Doushantuo phosphorites in the Weng’an area, Guizhou Province, South China, shows that the phosphatized Megasphaera ornata and the chert−preserved Tianzhushania tuberifera should be regarded as representing the same taxon preserved by different mineralization processes. In phosphatized specimens the outer wall is often peeled off, exposing the ornamented middle wall. Some phosphatized specimens isolated from the rock matrix and specimens seen in thin sections of phosphorites show a partly preserved outer wall with spines, which can be compared to the thin−sectioned specimens from the chert beds. The small pits usually seen on the surface of the ornamented middle wall of phosphatized specimens correspond to the attachment spots of the spines in the outer wall. The presence of a spiny outer wall is a characteristic of Tianzhushania Yin and Li, 1978. Tianzhushania ornata (Xiao and Knoll, 2000) comb. nov. is here proposed as the valid name for the species. The proposed resting−egg nature of T. ornata, mainly based on the ornament type of the middle wall, cannot be excluded. The presence of a spiny outer wall, however, suggests that it is a pelagic rather than a benthic form.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new tannuolinid problematic from the lower Cambrian of the Sukharikha River in northern Siberia
    Autorzy:
    Kouchinsky, A
    Bengtson, S.
    Murdock, D.J.E.
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/19940.pdf  Link otwiera się w nowym oknie
    Opis:
    A new species of tannuolinid, Tannuolina pavlovi, is reported from the basal Krasnoporog Formation cropping out along the Sukharikha River at the northwestern margin of the Siberian Platform. The new material expands the geographic range of tannuolinids onto the Siberian Platform and extends their stratigraphic range into the basal Tommotian Stage of the traditional Lower Cambrian. The oldest appearance of tannuolinids in the fossil record is shown herein to have occurred as early as the oldest appearance of the linguliformean brachiopods, of which tannuolinids have been suggested to be a stem group. The sellate sclerites of T. pavlovi sp. nov. are different from those of the other known species of Tannuolina in the consistent absence of a pronounced sella and duplicature on the respective sides of sclerites, as well as in having regularly distributed large setal pores on the lateral edges. The mitral sclerites of T. pavlovi sp. nov. do not clearly show asymmetry of left and right forms, manifested in other species by the presence of the carina on the interior surface. Large pores aligned along the lateral margins of sellate sclerites regularly coalesce below the wall surface from an apically and an aperturally directed basal branch, forming a nearly right angle.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Body weights of Apodemus sylvaticus in Iceland
    Autorzy:
    Nordström, S.
    Bengtson, S. A.
    Rundgren, S.
    Nilsson, A.
    Powiązania:
    Acta Theriologica
    Opis:
    Mysz zaroślowa Apodemus sylvaticus (Linnaeus, 1758) jest znacznie większa w Islandii niż np. w Europie Środkowej. Średni ciężar aktywnych płciowo samców waha się pomiędzy 32,4 a 34,5 g w 1973 roku i 29,9-33,5 g w 1974 roku.
    Dostawca treści:
    RCIN - Repozytorium Cyfrowe Instytutów Naukowych
    Książka
    Tytuł:
    An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
    Autorzy:
    Kouchinsky, A.
    Bengtson, S.
    Clausen, S.
    Vendrasco, M.J.
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/20089.pdf  Link otwiera się w nowym oknie
    Opis:
    An assemblage of mineralised skeletal fossils containing molluscs, hyoliths, halkieriids, chancelloriids, tommotiids, lobopodians, paleoscolecids, bradoriids, echinoderms, anabaritids, hyolithelminths, hexactinnelid, and heteractinid sponges is described from the early Cambrian Emyaksin Formation exposed along the Malaya Kuonamka and Bol’shaya Kuonamka rivers, eastern flanks of the Anabar Uplift, northern Siberian Platform. The sampled succession is attributed to the Tommotian–Botoman Stages of Siberia and correlated with Stage 2 of Series 1–Stage 4 of Series 2 of the IUGS chronostratigraphical scheme for the Cambrian. Carbon isotope chemostratigraphy is applied herein for regional correlation. The fauna contains the earliest Siberian and probably global first appearances of lobopodians, paleoscolecids, and echinoderms, and includes elements in common with coeval faunas from Gondwana, Laurentia, and Baltica. For the first time from Siberia, the latest occurrence of anabaritids is documented herein from the Atdabanian Stage. Problematic calcium phosphatic sclerites of Fengzuella zhejiangensis have not been previously known from outside China. The sellate sclerites, Camenella garbowskae and mitral sclerites, C. kozlowskii are unified within one species, C. garbowskae. In addition to more common slender sclerites, Rhombocorniculum insolutum include broad calcium phosphatic sclerites. A number of fossils described herein demonstrate excellent preservation of fine details of skeletal microstructures. Based on new microstructural data, sclerites of Rhombocorniculum are interpreted as chaetae of the type occurring in annelids. A new mollusc Enigmaconus? pyramidalis Kouchinsky and Vendrasco sp. nov. and a hyolith Triplicatella papilio Kouchinsky sp. nov. are described.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The problematic early Cambrian fossil Tumulduria incomperta represents the detached ventral interarea of a paterinid brachiopod
    Autorzy:
    Skovsted, C.B.
    Kouchinsky, A.
    Bengtson, S.
    Holmer, L.E.
    Tematy:
    brachiopoda
    problematica
    tommotian stage
    terreneuvian
    cambrian
    siberia
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/946021.pdf  Link otwiera się w nowym oknie
    Opis:
    The organophosphatic early Cambrian (Terreneuvian, Cambrian Stage 2) fossil Tumulduria incomperta has been problematic ever since its original description in 1969. Comparison of abundant specimens from the Lower Cambrian of Siberia with co-occurring brachiopod valves show that T. incomperta represents the central portion of the ventral interarea of a paterinid brachiopod similar to Cryptotreta neguertchenensis, and that the domed central portion of typical Tumulduria specimens represents the ridge-like pseudodeltidium of the interarea.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phosphatised olenid trilobites and associated fauna from the Upper Cambrian of Vastergotland, Sweden
    Autorzy:
    Ahlberg, P
    Szaniawski, H.
    Clarkson, E.N.K.
    Bengtson, S.
    Tematy:
    trilobite
    Trilobita
    Vastergotland
    Olenidae
    Sweden
    Upper Cambrian
    Cambrian
    phosphatization
    paleontology
    Pokaż więcej
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Powiązania:
    https://bibliotekanauki.pl/articles/19975.pdf  Link otwiera się w nowym oknie
    Opis:
    Secondarily phosphatised olenid trilobites from organic−rich limestones (orsten) in the Furongian (Upper Cambrian) of Västergötland, south−central Sweden, are described and illustrated. All trilobites originate from the Peltura scarabaeoides Zone and were collected on the western slope of Kinnekulle. Only the dorsal exoskeletons have become secondarily phosphatised, and the ventral appendages are not preserved. Yet the material is otherwise remarkably well preserved and reveals the morphology of the olenid trilobites in greater detail than hitherto known. Species belonging to the genera Ctenopyge, Sphaerophthalmus, Parabolina, and Peltura are identified, and several juvenile specimens are present in the material. The material is disarticulated and fragmentary, and it has only been possible to identify a few specimens to species level. In addition to chaetognaths and conodonts, the trilobites are associated with pelmatozoan columnals, a possible camaroid, and fossils of uncertain affinities. These fossils, along with a probable conulariid fragment from the Peltura minor Zone, are also described and discussed. The presence of a benthic fauna of pelmatozoans, and possible conulariids and camaroids, indicates that at least parts of the Peltura zones were deposited during dysoxic rather than anoxic periods. Moreover, the sea floor must have been firm enough to allow colonisation by sessile organisms.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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