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    Wyświetlanie 1-4 z 4
    Tytuł:
    Diversity of Recent Benthic Foraminifera and its Environmental Condition of Selected Estuaries in Tamil Nadu, India
    Autorzy:
    Yoganandan, V.
    Chandran, A. Siva
    Arunkarthik, P.
    Kavinila, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031823.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Distribution and Ecology
    Foraminifera
    Systematic Paleontology
    Opis:
    Micropaleontological investigation has been carried out, for the first time to study the systematic of recent Benthic Foraminifera from the southeast coast flowing river estuaries Cauvery, Athankarai and Thamirabarani, Tamil Nadu, India. Totally 16 sediment samples were collected during December 2018. Benthic foraminiferal species, belonging to 14 species, 7 families and 5 Sub-orders are identified. Among this Miliolida (>75%) occupies the dominant place followed by Rotaliida (<25%). The higher species are observed in the rivermouth area particularly in the Cauvery estuary sample (365 species of Ammonia beccarii). The following species are abundantly distributed in this region namely Ammonia beccarii, Quinqueloculina and Miliolinella subrotunda. The abundance of species in the river mouth may be due to the mixing of marine and nearshore environment.
    Źródło:
    World News of Natural Sciences; 2020, 30, 2; 75-88
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emsian Chitinozoa from the Buchan area of southeastern Australia
    Autorzy:
    Winchester-Seeto, T
    Powiązania:
    https://bibliotekanauki.pl/articles/20533.pdf
    Data publikacji:
    1996
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    stratigraphic distribution
    Australia
    fossil
    Taravale Formation
    Devonian
    Chitinizoa
    taxonomy
    systematic paleontology
    paleobiogeography
    Opis:
    Emisian chitinozoans from two sections through the Taravale Formation, near Buchan, southeastern Australia are doucmented. The fauna bears little resemblance to those extracted from contemporaneous successions in other parts of the globe. Seven chitinozoan assemblages are recognised with local stratigraphic application. Possible reasons for the unique composition of the fauna include biased preservation, highly developed endemism in the Emsian and an unusual depositional environment. The last suggests a degree of facies dependency in chitinozoans. Fifteen new species: Angochitina chilikalla, A. kurnai, A. warrugang, Bursachitina (Bursachitina) ngarigo, B. (B.) talenti, B. (Amplichitina) bidawal, B. (A.) jaimathang, B. (A.) kurritgo, B. (A.) erasilis, Eisenackitina birubi, E. hebeta, E. subditiva, E. warnangatte, E.? vieta, and E. yaraan are desribed. Two new subgenera are erected, Bursachitina (Bursachitina) and B. (Amplichitina).
    Źródło:
    Acta Palaeontologica Polonica; 1996, 41, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An enigmatic early ? palaeocope ostracode from the Arenig of NW Russia
    Autorzy:
    Tinn, O
    Meidla, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/22806.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    systematic position
    ostracod
    Ordovician
    Russia
    Ostracoda
    paleontology
    Lavachilina evae
    Opis:
    The ostracode Lavachilina evae gen. et sp. nov. is described from the Arenig of Western Russia. Its carapace possesses a unique discontinuous velum, developed at both ends as a narrow spinose ridge. The systematic position of L. evae is uncertain. Its character set shows mostly palaeocope affinities but also some features of leiocopes. L. evae is tentatively assigned to the palaeocope family Oepikellidae, possibly representing an early member of that family. Although L. evae existed contemporaneously with palaeocopes such as Laccochilina, it does not appear to be closely related to these early eurychilinoids.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The ultrastructure, development, and systematic position of the graptolite genus Mastigograptus
    Autorzy:
    Bates, D E B
    Urbanek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/21265.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Graptolithina
    internal structure
    graptolite
    development
    remains
    Pterobranchia
    taxonomy
    systematic position
    stratigraphy
    Mastigograptus
    Ordovician
    ultrastructure
    paleontology
    Opis:
    Fragments of rhabdosomes isolated by chemical treatment from an erratic boulder of Baltic origin and ?Middle Ordovician age, provisionally assigned to Mastigograptus aff. tenuiramosus (Wallcott, 1881) were studied with SEM. Although exceptionally well preserved, remains lack the thin−walled free portions of thecae. Rhabdosomes are provided with a strongly developed basal disc, short stem and many branched stipes. The latter consist of heavily corticalized chains of stolothecae with alternately disposed thecal bases. Stolothecae display a morphological gradient and increase in size and change in shape distalwards. The stolon system studied with SEM on naturally and artificially broken specimens, as well as traced through open thecal bases, reveals a regular triad budding but no stolon inside the stolothecal cavity. We tentatively suggest that crassal lining, recognized earlier by TEM studies, corresponds to an unusually inflated stolonal stolon, filling the entire thecal cavity and adhering tightly to stolothecal wall. The systematic position of Mastigograptus, a matter of long debate, seems to be defined by a number of structural features which imply a distinct difference between genus in question and all known orders of sessile graptolites. The order Mastigograptida nov. and the family Mastigograptidae nov. are proposed.
    Źródło:
    Acta Palaeontologica Polonica; 2002, 47, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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