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    Wyświetlanie 1-4 z 4
    Tytuł:
    Possible polychaete tubeworms from the Late Emsian (Early Devonian) of the Parana Basin, Brazil
    Autorzy:
    VINN, OLEV
    ZABINI, CAROLINA
    SENE-SILVA, GUSTAVO
    KIRSIMÄE, KALLE
    SUSAN-MARCOS, LARA
    Powiązania:
    https://bibliotekanauki.pl/articles/945663.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Plastically deformed and silicified worm tubes from the Late Emsian (Early Devonian) of the Parana Basin are described herein as a new species and genus of annelid worms Annulitubus mutveii gen. et sp. nov. The tubes are straight and ornamented by smooth rings. Their microstructure is homogenous, which most likely is a diagenetic alteration. The characteristic early diagenetic compression of the tubes may point out to their original elastic organic tube wall. We cannot state it with full confidence but the most likely tube producers were tube-dwelling polychaete annelids, which were otherwise uncommon in the Paleozoic times.
    Źródło:
    Acta Palaeontologica Polonica; 2016, 61, 3; 627-632
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intergrowth of bryozoans with other invertebrates in the Late Pridoli of Saaremaa, Estonia
    Autorzy:
    Vinn, Olev
    Ernst, Andrej
    Wilson, Mark A.
    Toom, Ursula
    Powiązania:
    https://bibliotekanauki.pl/articles/1835990.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    symbiosis
    bioclaustrations
    cystoporates
    trepostomes
    rugosans
    hydrozoans
    cornulitids
    microconchids
    Opis:
    Nine invertebrates intergrew with bryozoans in the latest Pridoli of Saaremaa, Estonia, namely: cornulitids (Cornulites baranovi and Conchicolites sp.), hydrozoans, rugosans (Tryplasma sp. and Entelophyllum sp.), Anoigmaichnus, microconchids (Tuberoconchus wilsoni), unknown tubicolous organisms and unknown soft-bodied organisms. The most common host of endobionts was Fistulipora przhidolensis, but trepostomes also participated in symbiotic associations. Solitary rugosan-cystoporate and hydrozoan-cystoporate associations were common in the Pridoli of Saaremaa, while other cases of intergrowth are rare. The rugosan-cystoporate, hydrozoan-cystoporate, hydrozoan-trepostome and Anoigmaichnus-cystoporate associations most likely were not a result of accidental intergrowth, whereas other associations presumably resulted from accidental intergrowth of two organisms. New data from the Pridoli of Saaremaa indicate that the Pridoli probably was not a time of lowered symbiosis levels in the regional ecosystem. Symbiosis levels in the Pridoli of Baltica were comparable to those in the Ludlow and Early Devonian worldwide.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2021, 91, 2; 102-111
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Discovery of plywood structure in Sphenothallus from Gurovo Formation (Mississippian), Central Russia
    Autorzy:
    Vinn, Olev
    Mironenko, Aleksandr A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1835998.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Scyphozoa
    biomineralization
    tube microstructure
    ultrastructure
    mineral composition
    Carboniferous
    Opis:
    Sphenothallus specimens are reported for the first time from the Mississippian of Central Russia. All Sphenothallus specimens have a phosphatic composition and a characteristic laminar structure, which is best observable in the thickened lateral parts of a tube. Most of the lamellae in the tube wall are straight, but some have a wavy morphology and a few are so wrinkled that they form hollow “ribs”. The wrinkled lamellae presumably had an originally higher organic content than the straight lamellae. There are borings on the surfaces of some lamel-lae that are similar in morphology to the bioerosional traces in various hard, biomineral substrates. Lamellae in the inner parts of the tube wall are composed of fibres. The fibres are parallel to the surface of the tube wall and in successive laminae they differ in orientation by irregularly varying angles. It is possible that the plywood micro-structure in Sphenothallus was originally organic and was later phosphatized during fossilization. An alternative, but less likely explanation is that the plywood structure was originally mineralized and therefore is comparable to the phosphatic lamello-fibrillar structures of vertebrates.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2021, 91, 1; 67-74
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A crustoid graptolite lithoimmured inside a Middle Ordovician nautiloid conch from northern Estonia
    Autorzy:
    Vinn, Olev
    Wilson, Mark A.
    Toom, Ursula
    Powiązania:
    https://bibliotekanauki.pl/articles/191686.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Encrustation
    graptolites
    nautiloids
    cryptic fauna
    Darriwilian
    Baltica
    Opis:
    A light grey nautiloid conch has a dark brown colony attached to its internal surface. This colonial fossil resembles hederellids and bryozoans, but is in fact a crustoid graptolite (Hormograptus? sp.). The colony has been lithoimmured inside this nautiloid conch by early cementation. Crustoid graptolites were a part of the encrusting communities in the Middle Ordovician of Baltica, but their abundance among encrusters of biogenic substrates reached a peak in the middle Sandbian. The cryptic mode of life appeared very early in the evolution of the crus- toids. The discovery of this crustoid graptolite in a nautiloid conch indicates that the Baltic Middle Ordovician cryptic communities were taxonomically more diverse than was known previously. The nautiloid conch studied is sparsely encrusted with an encrustation density that is similar to those of other Middle Ordovician cryptic surfaces described from Estonia.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2019, 89, 3; 285-290
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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