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30 results for “Belemnite”
Fig. 1 in Extremely Rare Turonian Belemnites from the Bohemian Cretaceous Basin and Their Palaeogeographical Importance
Fig. 1. Geographic position of belemnite locality Úpohlavy with GPS coordinates.
Data from: Ups and downs of belemnite diversity in the Early Jurassic of Western Tethys
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Middle to Late Jurassic palaeoclimatic and palaeoceanographic trends in the Euro-Boreal region: Geochemical insights from East Greenland belemnites
<p>Supplementary data and code for Vickers, M.L., Hougård, I.W., Alsen, P., Ullmann, C.V., Jelby, M.E., Bedington, M. and Korte, C., 2022. Middle to Late Jurassic palaeoclimatic and palaeoceanographic trends in the Euro-Boreal region: Geochemical insights from East Greenland belemnites. <em>Palaeogeography, Palaeoclimatology, Palaeoecology</em>, <em>597</em>, p.111014.</p>
Taxonomical diversity and palaeobiogeographical affinity of belemnites from the Pliensbachian - Toarcian GSSP (Lusitanian Basin, Portugal)
<p>For the first time, high-resolution analysis of the Late Pliensbachian - Early Toarcian belemnite assemblages from the Peniche section (Lusitanian Basin) is presented. The systematic analysis allowed the recognition of eight taxa of the suborder Belemnitina, previously reported from contemporaneous NW Tethyan and Arctic sections. The presence of <i>Bairstowius amaliae</i> sp. nov. in the Late Pliensbachian (Emaciatum Zone) represents a novelty since hitherto the genus <i>Bairstowius</i> was only known from Late Sinemurian and Early Pliensbachian deposits. Additionally, the replacement of <i>Bairstowius amaliae</i> by <i>Catateuthis longiforma</i>,<i> </i>during the latest Pliensbachian, suggests an evolutionary relationship between the two taxa. This relationship suggests a new scenario for the subsequent development of endemic Toarcian Boreal-Arctic faunas, characterised by the occurrence of <i>Catateuthis</i>. </p> <p>The comparison of the Peniche belemnite fauna with coeval faunas from the Mediterranean/Submediterranean and Euro-Boreal domains indicates taxonomic uniformity during the Late Pliensbachian – Early Toarcian (Emaciatum and Polymorphum zones), in the NW Tethys. Despite the lack of a marked taxonomic turnover, the Pliensbachian-Toarcian boundary corresponds to a slight decrease in diversity observed not only in the Lusitanian Basin but also in coeval NW European basins. Ordination and cluster analyses indicate that the largest changes in belemnite diversity and palaeogeographic distribution occurred rather during the Toarcian Oceanic Anoxic Event (base of Levisoni Zone). This event is marked by the extinction of taxa, affecting more severely the Mediterranean/Submediterranean domain and resulting in a provincial differentiation amongst NW European and Arctic belemnite faunas.</p>
Data from: Ontogenetic trajectories of septal spacing in Early Jurassic belemnites from Germany and France, and their palaeobiological implications
Based on well-preserved belemnites, the ontogenetic trajectories of septal spacing between succeeding chambers were analysed. In the examined species (Passaloteuthis laevigata, Parapassaloteuthis zieteni and Pseudohasitites longiformis) that come from Buttenheim, Germany, and Lixhausen, France, the ontogenetic trajectories of septal spacing follow exponentially increasing trends with no decreasing phase of septal crowding during the earliest ontogenetic stage. The absence of a decreasing trend at the earliest ontogenetic stage is a unique character in contrast with those in modern cuttlefish and ancient and modern nautiloids, in which the decreasing trends are related to hatching events. These ontogenetic septal spacing trends suggest that the belemnite hatchlings had only a protoconch with no chamber. These belemnite hatchlings with no chamber and therefore small embryonic shell diameter are similar to those of ammonoids. Significant difference in a statistical test that compared the protoconch size between the two localities, might suggest that there was limited transportation at the embryonic stage, although it could also just indicate differences in regional environmental conditions, age and/or degree of time averaging which might differ between the examined taxa.
Supplement to: Absolute age and temperature of belemnite rostra: constrains on the Early Cretaceous cooling event.
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FIGURE 1 in Bayesian inference reveals a complex evolutionary history of belemnites
FIGURE 1. Terminology of some of the characters applied coded for the analysis (modified after Mutterlose, 1983; Doyle, 1990; Schlegelmilch, 1998; Hoffmann and Stevens, 2020).
Taxonomical diversity and palaeobiogeographical affinity of belemnites from the Pliensbachian - Toarcian GSSP (Lusitanian Basin, Portugal)
Open the record for dataset details and reuse information.
Data from: Ontogenetic trajectories of septal spacing in Early Jurassic belemnites from Germany and France, and their palaeobiological implications
Open the record for dataset details and reuse information.
Supplement to: Absolute age and temperature of belemnite rostra: constrains on the Early Cretaceous cooling event.
<p>U-Pb data, stable carbon and oxygen isotopic data, clumped isotope data raw, and Sr-isotopic data</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.