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  • 1.
    Blieck, Alain
    et al.
    Université Lille – 1, France.
    Zigaite, Zivile
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Early and Middle Palaeozoic Vertebrate Palaeobiogeography: recent advances and critical comments2011In: Palaeozoic Early Vertebrates: II Obruchev Symposium. Abstracts / [ed] Oleg Lebedev and Alexander Ivanov, 2011, p. 28-28Conference paper (Other academic)
  • 2.
    Blieck, Alain
    et al.
    Université Lille – 1, France.
    Žigaitė, Živilė
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Paléobiogéographie des vertébrés du Paléozoïque inférieur et moyen: données et interprétations récentes2011In: Résumés des communications du congrès 2011 de l’Association Paléontologique Française / [ed] Bertrand Lefebre, 2011Conference paper (Other academic)
  • 3.
    Blom, Henning
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Zigaite, Zivile
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    New thelodont findings from the Lower Devonian Andrée Land Group, Spitsbergen, and their implications for biostratigraphy2012Conference paper (Other academic)
  • 4.
    Fadel, Alexandre
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    Zigaite, Zivile
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Blom, Henning
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Perez-Huerta, Alberto
    Jeffries, Teresa
    Maersse, Tiiu
    Ahlberg, Per Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Palaeoenvironmental signatures revealed from rare earth element (REE) compositions of vertebrate microremains of the Vesiku Bone Bed (Homerian, Wenlock), Saaremaa Island, Estonia2015In: Estonian journal of earth sciences, ISSN 1736-4728, E-ISSN 1736-7557, Vol. 64, no 1, p. 36-41Article in journal (Refereed)
    Abstract [en]

    Rare earth elements (REEs) have been analysed from fossil vertebrate microremains (thelodont scales) from the Vesiku Bone Bed, Saaremaa, Estonia, using in situ microsampling by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Well-preserved scales of three species of the genus Thelodus (T. carinatus, T. laevis and Thelodus sp.) show very uniform REE patterns with slightly lower overall REE concentrations in enameloid than in dentine, with enrichment in middle REEs, depletion in heavy REEs and pronounced negative europium anomaly, but no cerium anomaly. The results of this study suggest a similar diagenetic history and possibly contemporaneous habitats for all three Thelodus species, as well as possible suboxic to anoxic conditions of the bottom and pore waters during the formation of the Vesiku Bone Bed.

  • 5.
    Histon, Kathleen
    et al.
    University of Modena.
    Zigaite, ZivileUppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    Evolutionary palaeoecology and palaeobiogeography2014Collection (editor) (Refereed)
  • 6.
    Histon, Kathleen
    et al.
    University of Modena.
    Zigaite, Zivile
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Preface2015In: Estonian journal of earth sciences, ISSN 1736-4728, E-ISSN 1736-7557, Vol. 64, no 1, p. 1-2Article in journal (Other academic)
    Abstract [en]

    Evolutionary palaeoecology and palaeobiogeography: year 4 of the IGCP-591 project 'The Early to Middle Palaeozoic Revolution - Bridging the Gap between the Great Ordovician Biodiversification Event and the Devonian Terrestrial Revolution

  • 7.
    Mergl, Michal
    et al.
    Uniersity of West Bohemia.
    Vaskaninova, Valeria
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Zigaite, Zivile
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Vertebrate Microremains From The Pragian, Emsian And Eifelian Of The Prague Basin (Czech Republic)2017In: Folia Musei rerum naturalium Bohemiae occidentalis. Geologica et Paleobiologica, E-ISSN 1805-286X, Vol. 51, no 1/2, p. 1-12Article in journal (Refereed)
    Abstract [en]

    The vertebrate faunas in limestone samples of the Early and Middle Devonian ages (Pragian, early Emsian, late Emsian, and latest Eifelian) which were collected from five localities in the Barrandian area, Bohemia, include scales, tesserae, bones, and teeth of acanthodians, placoderms, chondrichthyans, and sarcopterygians. Although the vertebrate remains are not abundant the assemblages are significant in being dominated by particular taxa. Apart from undetermined microremains the genera Cheiracanthoides, Laliacanthus, Nostolepis, and Tassiliodus were determined.

  • 8.
    Qvarnström, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Niedzwiedzki, Grzegorz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    Tafforeau, Paul
    European Synchrotron Radiation Facility.
    Zigaite, Zivile
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    Ahlberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    3D – visualization of vertebrate coprolites through phase contrast synchrotron imaging unravel new aspects of paleoecological relations2017In: 77th Annual Meeting of the Society of Vertebrate Paleontology, Abstract book, 2017, p. 181-Conference paper (Refereed)
  • 9.
    Qvarnström, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Niedzwiedzki, Grzegorz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Tafforeau, Paul
    European Synchrotron Radiat Facil, 71 Ave Martyrs,CS40200, F-38043 Grenoble, France..
    Zigaite, Zivile
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Ahlberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Synchrotron phase-contrast microtomography of coprolites generates novel palaeobiological data2017In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 2723Article in journal (Refereed)
    Abstract [en]

    Coprolites (fossil faeces) reveal clues to ancient trophic relations, and contain inclusions representing organisms that are rarely preserved elsewhere. However, much information is lost by classical techniques of investigation, which cannot find and image the inclusions in an adequate manner. We demonstrate that propagation phase-contrast synchrotron microtomography (PPC-SR mu CT) permits high-quality virtual 3D-reconstruction of coprolite inclusions, exemplified by two coprolites from the Upper Triassic locality Krasiejow, Poland; one of the coprolites contains delicate beetle remains, and the other one a partly articulated fish and fragments of bivalves.

  • 10.
    Qvarnström, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Niedzwiedzki, Grzegorz
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Zigaite, Zivile
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Vertebrate coprolites (fossil faeces): An underexplored Konservat-Lagerstatte2016In: Earth-Science Reviews, ISSN 0012-8252, E-ISSN 1872-6828, Vol. 162, p. 44-57Article, review/survey (Refereed)
    Abstract [en]

    Fossilized soft tissues of animals (e.g. muscles, hair and feathers) are valuable sources of palaeobiological information, but a poor preservation potential makes them undesirably scarce in the fossil record. The aim of this review is to summarize main findings, current progress and the analytical constraints of detecting fossilized soft tissues in coprolites from, mainly, freshwater and terrestrial carnivorous vertebrates. We conclude that soft-tissue inclusions in coprolites are sources of two important lines of information: the fossils can be put in a direct palaeoecological context, and characters of extinct taxa are more likely preserved in the phosphate-rich taphonomic microenvironment of coprolites than elsewhere. As a result, it is possible to unravel the deep-time origins of host-parasite relations, to understand ancient trophic food webs and detect new soft-tissue characters of different animal groups. Examples of the latter include muscle tissues from a tyrannosaurid prey, tapeworm eggs (including a developing embryo) in a Permian shark coprolite, as well as hair from multituberculates and, probably, from stem-mammals (Therapsids). Additionally, the use of coprolites in an archaeological context is briefly reviewed with focus on key aspects that may become implemented in studies of pre-Quaternary specimens as well. In summary, there is a wide range of information that can be extracted from coprolites, which has not yet been fully explored in palaeontological studies.

  • 11.
    Zigaite Moro, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Whitehouse, Martin
    Naturhistoriska Riksmuseet, Stockholm.
    Joachimski, Michael M.
    University of Erlangen, Nuremberg.
    Les isotopes stables de l’oxygene dans des biominéraux dentaires des vertébrés actuels: différenciation au niveau des tissues et des espèces dans les dents de requins actuels2016Conference paper (Other academic)
  • 12.
    Zigaite, Zivile
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Endemic thelodonts (Vertebrata: Thelodonti) from the Lower Silurian of central Asia and southern Siberia2013In: Earth and environmental science transactions of the Royal Society of Edinburgh, ISSN 1755-6910, E-ISSN 1755-6929, Vol. 104, no 2, p. 123-143Article in journal (Refereed)
    Abstract [en]

    New fossil vertebrate microremains from the Lower Silurian of NW Mongolia, Tuva and S Siberia have been discovered, and previous collections of thelodonts (Vertebrata: Thelodonti) from this region re-studied, figured and described, following recent advances in morphology and systematics of thelodont scales. As a result, six thelodont species are described here and attributed to two families and three genera. An emended diagnosis is given for each species. Morpohological scale varieties of each species are revised, and the squamation types are introduced to the species descriptions, resulting in newly grouped morphological sets of scales. The previously monotypic genus Talimaalepis Zigaite, 2004, is proposed to contain two different species; therefore, two new combinations of morphological scale sets of two species are described for the first time. Both of them show transitional scale structure between the genera Loganellia (family Loganellidae) and Helenolepis (family Phlebolepididae). Two of the thelodont genera, Angaralepis and Talimaalepis, as well as all the six species, are endemic and not known anywhere else in the world. They are accompanied by a variety of other peculiar early vertebrates, such as mongolepids, two endemic genera of acanthodians, and putative galeaspids. This work enhances our knowledge of early Silurian vertebrate diversity, and provides evidence of regional palaeoenvironmental conditions and palaeogeographical relationships of the Siberia and Tuva terranes.

  • 13.
    Zigaite, Zivile
    et al.
    University of Lille-1.
    Blick, Alain
    University of Lille-1.
    Palaeobiogeographical significance of Early Silurian thelodonts from central Asia and southern Siberia2006In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 128, no 2, p. 203-206Article in journal (Refereed)
  • 14.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Blieck, Alain
    University Lille 1, France.
    Palaeobiogeography of Early Palaeozoic vertebrates2013In: Early Palaeozoic Biogeography and Palaeogeography / [ed] Harper, DAT; Servais, T, London, 2013, Vol. 38, p. 449-460Conference paper (Refereed)
    Abstract [en]

    The oldest known Palaeozoic vertebrate record currently is Early Cambrian in age. The first taxa with mineralized exoskeletons are at least Ordovician in age, followed by a sporadic fossil record with Talimaa’s Gap of c. 3 myr in the Rhuddanian (earliest Silurian). Ordovician and Silurian vertebrate faunas are dominated by ‘agnathans’. Early Palaeozoic vertebrates occupied a wide range of environments: nearshore marine to restricted marine in the Ordovician, and on the marine epicontinental shelves of the Silurian. Silurian vertebrates are useful biostratigraphical indicators, as well as good markers of palaeocontinental margins. Two main palaeobiogeographical units are renamed for the Ordovician: a Gondwana Realm and a Laurentia–Siberia–Baltica Realm. Vertebrate fossil localities are more numerous in the Silurian; therefore a series of palaeobiogeographical provinces and realms are defined on Laurentia, Baltica, Avalonia, Siberia, South China and East Gondwana. More discoveries of Silurian vertebrate-bearing localities should certainly help to define additional provinces, in particular along the northern margins of Gondwana and in SE Asia.

  • 15.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Blieck, Alain
    University of Lille-1.
    Palaeobiogeography of Early Palaeozoic vertebrates2013In: Geological Society Memoir, ISSN 0435-4052, E-ISSN 2041-4722, Vol. 38, no 1, p. 449-460Article in journal (Refereed)
    Abstract [en]

    The oldest known Palaeozoic vertebrate record currently is Early Cambrian in age. The first taxa with mineralized exoskeletons are at least Ordovician in age, followed by a sporadic fossil record with Talimaa's Gap of c. 3 myr in the Rhuddanian (earliest Silurian). Ordovician and Silurian vertebrate faunas are dominated by 'agnathans'. Early Palaeozoic vertebrates occupied a wide range of environments: nearshore marine to restricted marine in the Ordovician, and on the marine epicontinental shelves of the Silurian. Silurian vertebrates are useful biostratigraphical indicators, as well as good markers of palaeocontinental margins. Two main palaeobiogeographical units are renamed for the Ordovician: a Gondwana Realm and a Laurentia-Siberia-Baltica Realm. Vertebrate fossil localities are more numerous in the Silurian; therefore a series of palaeobiogeographical provinces and realms are defined on Laurentia, Baltica, Avalonia, Siberia, South China and East Gondwana. More discoveries of Silurian vertebrate-bearing localities should certainly help to define additional provinces, in particular along the northern margins of Gondwana and in SE Asia.© The Geological Society of London 2013.

  • 16.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Blom, Henning
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Goujet, Daniel
    Thelodont biostratigraphy indicates the extension of the Lower-Middle Devonian palaeobasin in Svalbard, Norvegian Arctics2012In: Geophysical Research Abstracts, 2012, p. EGU2012-10028-Conference paper (Other academic)
  • 17.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Blom, Henning
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Perez-Huerta, Alberto
    University of Alabama.
    Goujet, Daniel
    Museum nationale d'histoire naturelle Paris.
    Vertebrate microfossils as tool in stratigraphy: a study of the Lower Devonian Andree Land Group, Spitsbergen2014In: STRATI 2013: First International Congress on Stratigraphy At the Cutting Edge of Stratigraphy, Cham: Springer International Publishing , 2014, p. 1167-1171Conference paper (Refereed)
  • 18.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Blom, Henning
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    Pérez-Huerta, Alberto
    University of Alabama.
    Goujet, Daniel
    Muséum national d'histoire naturelle.
    Vertebrate Microfossils as Tools in Stratigraphy: A Study of the LowerDevonian Andrée Land Group Spitsbergen2014In: Springer Geology, p. 1167-1171Article in journal (Refereed)
    Abstract [en]

    We have studied vertebrate microremains from the Lower to Middle Devonian of the Andrée Land Group, comprising the Wood Bay and Grey Hoek formations. We have defined two new thelodont assemblages, which represent different depositional phases during the late Early to early Middle Devonian formation of the Andrée Land Group. The definition of these two new thelodont assemblages allows us to precisely establish the relative ages of the Lower–Middle Devonian strata. Rare earth element (REE) abundances were measured in a number of thelodont and chondrichthyan microfossil dental tissue biominerals, using laser ablation inductively coupled plasma mass spectrometry (LA–ICP–MS). The evaluation of fossil preservation level was performed using semiquantitative spot-geochemistry analyses on finely polished thelodont scale thin-sections using Energy Dispersive X-ray Spectroscopy (EDS), and Electron Backscattering Diffractometry (EBSD) was applied to detect recrystallization. Stable oxygen isotope measurements (δ18O) of bulk biominerals were conducted in parallel, and showed lower heavy oxygen values in the fossil tissues with stronger visible alteration, such as those from the Grey Hoek Formation. Our results suggest that certain lithostratigraphic units of the Andrée Land Group must be regarded as contemporaneous lithofacies subjected to different sedimentary environments, rather than as separate stratigraphic members.

  • 19.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Fadel, Alexander
    University of Lille-1.
    Qvarnström, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Pérez-Huerta, Alberto
    University of Alabama.
    Jeffries, Teresa
    London Natural History Museum.
    Early vertebrate microremains as proxies to palaeoenvironment: rare earth elements in dermal scale biominerals from the Silurian and Lower Devonian2016In: Thansactions of the Society of Micropalaeontology, 2016Conference paper (Other academic)
  • 20.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Fadel, Alexander
    University of Lille-1.
    Qvarnström, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    Pérez-Huerta, Alberto
    University of Alabama.
    Jeffries, Teresa
    London Natural History Museum.
    Early vertebrate microremains as proxies to palaeornvironment :: rare earth elements ind ermal scale biominerals from the Silurian and Lower Devonian2018In: Résumés de la 26-eme RST 2018, 2018, Vol. 3, p. 301-301Conference paper (Refereed)
  • 21.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Fadel, Alexandre
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Blom, Henning
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Perez-Huerta, Alberto
    Jeffries, Teresa
    Maerss, Tiiu
    Ahlberg, Per Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Rare earth elements (REEs) in vertebrate microremains from the upper Pridoli Ohesaare beds of Saaremaa Island, Estonia: geochemical clues to palaeoenvironment2015In: Estonian journal of earth sciences, ISSN 1736-4728, E-ISSN 1736-7557, Vol. 64, no 1, p. 115-120Article in journal (Refereed)
    Abstract [en]

    Rare earth element (REE) compositions of Nostolepis sp. scales, spines, plates and tesserae from Ohesaare bone beds were measured by in situ microsampling using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The obtained REE concentrations, normalized to Post-Archean Australian Shale concentrations, were evaluated using basic geochemical calculations and quantifications. The REE compositions were nearly identical across all the morphotypes and histologies of Nostolepis microremains, showing flat REE patterns with slight depletion in heavy REEs. There was no visible enrichment in middle REEs, indicating good geochemical preservation of bioapatite and absence of any pronounced fractionated REE incorporation during later stages of diagenesis. The shale-normalized (La/Yb)(SN) and (La/Sm)(SN) REE ratio compilations indicated adsorption as the dominating REE uptake mechanism across all datapoints. The absence of well-defmed Ce anomaly suggested oxic palaeoseawater conditions, which agrees with the existing interpretations of the Ohesaare sequence as high-energy shoal and regressive open ocean sedimentary environments.

  • 22.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Fadel, Alexandre
    Universite Lille-1.
    Blom, Henning
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Perez-Huerta, Alberto
    University of Alabama.
    Jeffries, Teressa
    Natural History Museum London.
    Ahlberg, Per Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Rare earth and trace elements in fossil vertebrate biomineral as indicators of palaeoecology and palaeoenvironment2014In: 4th Annual Meeting of IGCP 591 The Early to Middle Paleozoic Revolution Estonia, 10-19 June 2014Abstracts & Field Guide, 2014, p. 105-105Conference paper (Refereed)
  • 23.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    Fadel, Alexandre
    Universite Lille-1.
    Perez-Huerta, Alberto
    University of Alabama.
    Jeffries, Teresa
    London Natural History Museum.
    Blom, Henning
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    Ahlberg, Per Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology.
    Rare earth and trace elements of fossil bioapatite as palaeoenvironmental proxies: the Lower Devonian of the Andree Land, Svalbard2014In: Résumés dela 24eRéunion des Sciences de la Terre Abstracts, 2014, p. 481-481Conference paper (Refereed)
  • 24.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Fadel, Alexandre
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology. Univ Lille 1, CNRS UMR8217, Lab Geosyst, F-59655 Villeneuve Dascq, France.
    Perez-Huerta, Alberto
    Univ Alabama, Dept Geol Sci, 2018 Bevill Bldg, Tuscaloosa, AL 35487 USA.
    Jeffries, Teresa
    Dept Earth Sci, Nat Hist Museum, Cromwell Rd, London SW7 5BD, England.
    Goujet, Daniel
    Museum Natl Hist Nat, Dept Hist Terre, Lab Paleontol, UMR CNRS 7207, 57 Rue Cuvier, F-75231 Paris 5, France.
    Ahlberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Palaeoenvironments revealed by rare-earth element systematics in vertebrate bioapatite from the Lower Devonian of Svalbard2016In: Canadian journal of earth sciences (Print), ISSN 0008-4077, E-ISSN 1480-3313, Vol. 53, no 8, p. 788-794Article in journal (Refereed)
    Abstract [en]

    In situ rare-earth element (REE) compositions have been measured in early vertebrate microremains from the Lower Devonian basin of Andree Land (Svalbard), with the aim of obtaining information about their early depositional environment and potential reworking. Vertebrate microremains with different histology were used for the analyses, sourced from two different localities of marginal marine to freshwater sediments from geographically distant parts of the Grey Hoek Formation (Skamdalen and Tavlefjellet members). We selected thelodont and undescribed ? chondrichthyan scales, which allowed us to define potential taxonomic, histological, and taphonomic variables of the REE uptake. Results showed REE concentrations to be relatively uniform within the scales of each taxon, but apparent discrepancies were visible between the studied localities and separate taxa. The compilation of REE abundance patterns as well as REE ratios have revealed that thelodont and ? chondrichthyan originating from the same locality must have had different burial and early diagenetic histories. The shapes of the REE profiles, together with the presence and absence of the Eu and Ce anomalies, equally suggested different depositional and diagenetic environments for these two sympatric taxa resulting from either stratigraphical or long-distance reworking. The REE concentrations appear to have visible differences between separate dental tissues, particularly between enameloid and dentine of thelodonts, emphasizing the importance of in situ measurements in microfossil biomineral geochemistry.

  • 25.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Goujet, Daniel
    Museum National Histoire Naturelle.
    New observations on the squamation patterns of articulated specimens of Loganellia scotica (Traquair, 1898) (Vertebrata: Thelodonti) from the Lower Silurian of Scotland2012In: Geodiversitas, ISSN 1280-9659, E-ISSN 1638-9395, Vol. 34, no 2, p. 253-270Article in journal (Refereed)
    Abstract [en]

    Articulated squamations of Loganellia scotica (Traquair, 1898) from the Lower Silurian Lesmahagow inliers of southern Scotland have been studied. They include seven articulated specimens, three of them representing complete thelodont fossils, and four partially preserved postpectoral, precaudal and caudal parrs of the exoskeleton. All the five main types of thelodont scales that is rostral, cephalo-pectoral, postpectoral, precaudal and pinnal sacles, as well as respective squamation patterns have been observed on articulated specimens. The specific orbital, branchial, and bucco-pharyngeal scales, characteristic of L. scotica, have not been found due to the poor or non-preservation of these particular areas within the specimens studied. Tail morphology and squamation pattern of the caudal fin have been studied with particular attention, and the constitution of the caudal fin rays has been analyzed. The rostral squamation pattern is argued to be characteristic to L. scotico.

  • 26.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Jeffries, Teresa
    London Natural History Museum.
    Qvarnström, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Pérez-Huerta, Alberto
    University of Alabama.
    Distribution histologique des terres rares (REE) dans des microrestes de vertébrés du Paléozoique Inférieur2016Conference paper (Refereed)
  • 27.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Karatajute-Talimaa, Valentina
    Vilnius University.
    Aspidin or galeaspidin: new early vertebrate histology from the Lower Silurian of Southern Siberia2011In: Program and Abstracts: 71st Annual Meeting Society of Vertebrate Paleontology, 2011, p. Sec1: 221-Conference paper (Refereed)
  • 28.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Karatajute-Talimaa, Valentina
    Vilnius University.
    Goujet, Daniel
    Museum national d'histoire naturelle.
    Blom, Henning
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Thelodont scales from the Lower and Middle Devonian Andree Land Group, Spitsbergen2013In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 135, no 1, p. 57-73Article in journal (Refereed)
    Abstract [en]

    Scales of six thelodont taxa are described from the Devonian of Spitsbergen. Numerous samples from localities widely dispersed on Spitsbergen yield several assemblages considered to represent different depositional phases of the late Lower lower Middle Devonian of the Andrée Land Group, but also support the view that certain lithostratigraphic units of the Andrée Land Group should be regarded as contemporaneous lithofacies subjected to different sedimentary environments, rather than as separate stratigraphic members. The description of Woodfjordia collisa gen. et sp. nov., Talivalia svalbardia sp. nov., Canonia cf. C. grossi, Amaltheolepis montiwatsonia sp. nov., Amaltheolepis winsnesi and Amaltheolepis austfjordia sp. nov. also allows for a comparison with similar faunas from other regions of the Northern Hemisphere and motivates further elaboration of Early-Middle Devonian thelodont biostratigraphy.

  • 29.
    Zigaite, Zivile
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
    Karatajute-Talimaa, Valentina
    Vilnius University.
    Joachimski, Michael M.
    University of Erlangen Nuremberg.
    Jeffries, Teresa
    London Natural History Museum.
    Silurian vertebrates from northern Mongolia:: diversity, ecology and environment2014Conference paper (Refereed)
  • 30.
    Zigaite, Zivile
    et al.
    University of Lille-1.
    Karatakute-Talimaa, Valentina