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355 results for “conodont”
FIGURE 2 in Taxonomy and stratigraphic distribution of Lotagnostus (Agnostida: Agnostidae) and associated trilobites and conodonts in the Upper Cambrian (Furongian) of Laurentia
FIGURE 2. Field photographs of the Windfall Formation, Ninemile Canyon, Nevada. (1) View (facing east) of intermittent exposures of Windfall Formation sampled on north side of tributary of Ninemile Canyon. (2) Intercalated lime grainstone and calcareous shale. (3) Collection horizon for 5/22/08B at hand from middle Windfall. (4) Agnostoid-trilobite coquina from collection 5/22/08B; CM 41300. (5) Recumbent, soft-sediment folds in upper Windfall. (6) Grainstone lens in upper Windfall that yielded 5/22/08D at hammer head. (7) Grainstone boudins and laminated calcareous shales in middle Windfall.
Data from: Harnessing stratigraphic bias at the section scale: conodont diversity in the Homerian (Silurian) of the Midland Platform, England
Fossil abundance and diversity in geological successions are subject to bias arising from shifting depositional and diagenetic environments, resulting in variable rates of fossil accumulation and preservation. In simulations, this bias can be constrained based on sequence-stratigraphic architecture. Nonetheless, a practical quantitative method of incorporating the contribution of sequence-stratigraphic architecture in community palaeoecology and diversity analyses derived from individual successions is missing. As a model of faunal turnover affected by the stratigraphic bias, we use the 'Mulde event', a postulated mid-Silurian interval of elevated conodont turnover, which coincides with global eustatic sea-level changes and which has been based on regionally constrained observations. We test whether conodont turnover is highest at the boundary corresponding to the 'event' and post-'event' interval against the alternative that conodont turnover reflects habitat tracking and peaks at facies shifts. Based on the previously documented, parasequence-level stratigraphic framework of sections in the northern and central part of the Midland Platform, the relative controls of sequence-stratigraphic architecture, time and depositional environment over conodont distribution are evaluated using permutational multivariate analysis of variance. The depositional environment controls the largest part of variability in conodont assemblage composition, whereas the postulated 'Mulde event', or genuine temporal change in conodont diversity, cannot be detected. Depending on the binning of the stratigraphic succession, contrasting diversity and turnover patterns can be produced. The simple approach proposed here, emulating partitioning of β diversity into spatial and temporal components, may help to constrain the stratigraphic bias, even at the scale of an individual section.
Early Triassic Thermal Maximum and its ecological impact on conodonts
<p>Supporting Information for</p> <p><strong>Early Triassic Thermal Maximum and its ecological impact on conodonts</strong></p>
New insights on micro-scale variations of geochemical and oxygen isotope compositions in conodont and shark tooth bioapatite: Datasets
<p>The files contain the Research Data for the article entitled <strong>'New insights on micro-scale variations of geochemical and oxygen isotope compositions in conodont and shark tooth bioapatite'</strong>. A table of contents is provided. In summary, the files are: the raw geochemical data (scanning electron microscopy, electron microprobe analysis, stable isotope analysis), and profilometer images showing samples’ topography (please consult the README file) used in the referred article. The data normalisation was given as Supplementary Data in the publication. Any doubt or question about these are welcomed by me (Zoneibe Luz) for discussion or further considerations.</p>
Data from: Taxonomic and evolutionary pattern revisions resulting from geometric morphometric analysis of Pennsylvanian Neognathodus conodonts, Illinois Basin
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Data from: Donoghue, P.C.J., 2001. Conodonts meet cladistics: recovering relationships and assessing the completeness of the conodont fossil record
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Data from: Ontogenetic variability in crystallography and mosaicity of conodont apatite: Implications for microstructure, paleothermometry and geochemistry
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Data from: A review of the evolution, biostratigraphy, provincialism and diversity of Middle and early Late Triassic conodonts
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Data from: Wear, tear and systematic repair: testing models of growth dynamics in conodonts with high-resolution imaging
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Data from: Allometry in Anisian (Middle Triassic) segminiplanate conodonts and its implications for conodont taxonomy
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Data from: Harnessing stratigraphic bias at the section scale: conodont diversity in the Homerian (Silurian) of the Midland Platform, England
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Data from: Late Triassic (Julian) conodont biostratigraphy of a transition from reefal limestones to deep-water environments on the Cimmerian terranes (Taurus mountains, southern Turkey)
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Data from: Geometric morphometrics suggests different environmental pressures on small and large <em>Polygnathus</em> conodonts during the recovery after the Hangenberg crisis (latest Devonian-earliest Carboniferous)
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Data from: Katian (Upper Ordovician) conodonts from Wales
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Data from: Deciphering the roles of environment and development in the evolution of a Late Triassic assemblage of conodont elements
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Data from: There is no general model for occlusal kinematics in conodonts
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Data from: Silurian (late Llandovery–Wenlock) conodont fauna and biostratigraphy from the Yanbian area of Sichuan province, south-west china
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Data from: The interrelationships of 'complex' conodonts (Vertebrata)
Little attention has been paid to the suprageneric classification for conodonts and existing schemes have been formulated without attention to homology, diagnosis and definition. We propose that cladistics provides an appropriate methodology to test existing schemes of classification and in which to explore the evolutionary relationships of conodonts. The development of a multi-element taxonomy and a concept of homology based upon the position, not morphology, of elements within the apparatus provide the ideal foundation for the application of cladistics to conodonts. In an attempt to unravel the evolutionary relationships between 'complex' conodonts (prioniodontids and derivative lineages) we have compiled a data matrix based upon 95 characters and 61 representative taxa. The dataset was analysed using parsimony and the resulting hypotheses were assessed using a number of measures of support. These included bootstrap, Bremer Support and double-decay; we also compared levels of homoplasy to those expected given the size of the dataset and to those expected in a random dataset. The dataset was analysed in three hierarchical tranches, representing three levels of certainty concerning multi-element reconstructions and positional homologies. There is much agreement between the results derived from the three partitions, but some inconsistency, particularly in the precise composition of the three main evolutionary grades traditionally recognised (Prioniodontida, Prioniodinina, Ozarkodinina). This is considered to result from (a) the progressive inclusion of data that is increasingly uncertain and (b) the inclusion of increasingly distantly related taxa, introducing spurious hypotheses of homology. We tested for these by partitioning the dataset into the three main evolutionary grades and in each instance resolution was seen to in-crease substantially, especially among prioniodinins. Our concluding scheme of relationships is a tree derived from a compilation of the three component subtrees, which is directly compatible with the most-parsimonious trees derived from the initial second tranche analysis with the exception of the position of Hibbardella. This is compared in detail to the main extant schemes of suprageneric classification. A formal scheme of suprageneric classification is presented and the distribution of characters
Data from: Testing hypotheses of element loss and instability in the apparatus composition of complex conodonts: articulated skeletons of Hindeodus
Knowledge of the conodont skeleton, in terms of the morphology of the elements and the positions they occupy, provides the foundation for understanding of homology, taxonomy and evolutionary relationships in conodonts. This knowledge also underpins analyses of conodont functional morphology and feeding. Direct evidence of skeletal anatomy and apparatus architecture comes from natural assemblages: fossils that preserve together the articulated remains of the conodont apparatus, either collapsed onto a bedding plane or as clusters of elements in which juxtaposed and overlapping elements have been fused together by diagenetic minerals. Here we describe six clusters of the biostratigraphically important conodont Hindeodus parvus from the Lower Triassic Shangsi section, Sichuan Province, South China. Five of these clusters represent the partial remains of articulated skeletons, providing direct evidence of the number and arrangement of elements in the apparatus. Combined with data from previously published natural assemblages this provides a test of the hypothesis that Triassic conodonts had a reduced dentition. Hindeodus parvus possessed a complete raptorial array of two M and nine S elements (unpaired S0; symmetrically paired S1, S2, S3, S4); the paired P1 locations were occupied by carminiscaphate elements, but the apparatus lacked P2 elements. This is consistent with broader evidence for a particularly high degree of integration and constraint operating on the S–M array of morphologically complex conodonts, leading to conserved architecture of the array over a period of more than 250 million years. The loss of elements from the P domain implies a change in food processing ability and, given the predominance of data from P elements in conodont taxonomy and biostratigraphy, the hypothesis of element loss from the P domain has significant implications for the broader understanding of conodont diversity and evolutionary patterns.
Fig. 27. Scolopodus quadratus Pander, 1856 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 27. Scolopodus quadratus Pander, 1856: A–C, Pb element, AMF120472, Y4–2, A, outer lateral view, B, outer lateral view of the basal part, showing fine striae, C, inner lateral view; D–F, Sa element, AMF120475, Y4–2, D,F, lateral views, E, close up showing sharp costae and fine striae; G,H, Sb element, AMF120473, Y4–2, G, outer lateral view, H, inner lateral view; I, Sb element, AMF120471, Y4–2, inner lateral view; J–L, Sd element, AMF120474, W5, J, posterior view, K, inner lateral view, L, outer lateral view; M–O, Sc element, AMF120470, TAB1/8.1, M, outer lateral view, N, inner lateral view, O, basal view. Scale bars 100 µm.
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