Methodology of the micro-computer tomography on foraminifera

Görög, Ágnes; Szinger, Balázs; Tóth, Emőke; Viszkok, János

doi:10.26879/261

Cited by 24 publications

(27 citation statements)

References 17 publications

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“…Using a Zeiss Xradia 520 Versa µ CT scanner, multiple X-ray projections (radiographs) were acquired through a 360 • rotation of the sample (Görög et al, 2012; Table 1). From these data a 3-D volume was built, allowing for high-quality internal and external analysis (Briguglio et al, 2016).…”

Section: µ Ct Scanning and Metrologymentioning

confidence: 99%

Ontogenetic disparity in early planktic foraminifers

Kendall

Gradstein

Jones

et al. 2020

J. Micropalaeontol.

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Abstract. Changes in morphology during ontogeny can have profound impacts on the physiology and biology of a species. Studies of ontogenetic disparity through time are rare because of the lack of preservation of developmental stages in the fossil record. As they grow by incremental chamber accretion and retain evidence of growth in their shell, planktic foraminifera are an ideal group for the study ontogenetic disparity through the evolution of a higher taxon. Here, we quantify different developmental stages in Jurassic foraminifers and infer the evolutionary implications of the shape of these earliest representatives of the group. Using a Zeiss Xradia micro-CT scanner, the development of Globuligerina bathoniana and Globuligerina oxfordiana from the Bathonian sediments of Gnaszyn, Poland, and Globuligerina balakhmatovae and Globuligerina tojeiraensis from the Kimmeridgian Tojeira Formation of Portugal was reconstructed. Disparity is low through the early evolution of planktic foraminifers. The number of chambers and range in surface area per unit volume are lower than in modern specimens. We interpret this morphology as an indication of opportunistic behaviour. The low morphological plasticity during the juvenile stage suggests that strong constraints on the juveniles, described in the modern ocean, were already acting on Jurassic specimens. The high surface area per unit volume in these developmental stages points towards the need to satisfy a higher metabolic demand than in the adult specimens. We are interpreting the lower chamber numbers as indicative of short life cycles and potentially rapid reproduction, both of which may have allowed these species to exploit the nutrient-rich waters of the Jurassic Tethys Ocean.

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Section: µ Ct Scanning and Metrologymentioning

confidence: 99%

Ontogenetic disparity in early planktic foraminifers

Kendall

Gradstein

Jones

et al. 2020

J. Micropalaeontol.

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“…The 3D-technique for Micro-CT can produce multiple tomographic images (slices). These multiple tomographic images can be applied to a specific program for generating 3D-models which provides details of internal and external structures (Baumgartner-Mora et al, 2006;Görög et al, 2010;Dardon et al, 2010;Briguglio and Benedetti, 2012;Briguglio et al, 2013Briguglio et al, , 2014Ferrández-Canadell et al, 2014;Eder et al, 2016).…”

Section: Three Dimensional Technique For Micro-ctmentioning

confidence: 99%

“…Some types of tomographs are more suitable for large materials and allow to scan ossicles, teeth, minerals, small pieces of fossil plants, porosities and microstructures of different natures (Lasso et al, 2008;Garwood et al, 2009;Garwood and Sutton, 2010). Micro-CT is able to scan at high resolution, materials with micrometers dimension, including foraminifera (Görög et al, 2010;Briguglio and Benedetti, 2012;Briguglio et al, 2013Briguglio et al, , 2014Ferrández-Canadell et al, 2014;Eder et al, 2016), or nanometers dimension.…”

Section: Three Dimensional Technique For Micro-ctmentioning

confidence: 99%

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Three Dimensional Models of Pyrgo Depressa (D’orbigny, 1826) (Foraminifera) Performed With Microtomography Techniques

et al. 2016

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Graphic Computer and the three dimensional technique (3D) has its applicability in various fields of science, such as: medicine, zoology, botany and paleontology. In the paleontology field it has been applied, mainly in the study of vertebrates and invertebrates fossils. The 3D-models of the scanned fossils by computed microtomography (micro-CT) allow to observe full details of its internal and external morphology. The three-dimensional model of the species provides great detailing of internal and external structures, which can contribute to a better understanding and characterization of morphological features of the analyzed materials. This work aims to detail the morphology of Pyrgo depressa (d'Orbigny, 1826) (benthic foraminifera) using the micro-CT technics. Results of imagens and of the 3D-modells obtained by micro-CT analysis allowed the observation of the initial and later chambers arrangement, the proloculus with a columnar structure and two apertures, the sequence and linearization of the apertures and toothplates of the following chambers, the walls thickness and density. The 3D-models also allow to deduce the function of teeth which is related to the initial formation of the peripheral keel.

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“…Early taxonomic works often included excellent drawings. In the course of time, drawings have been supplemented with photographs, microphotographs, SEM micrographs, multi-focus images, and (most recently) images produced by confocal laser scanning microscopy (cLSM), optical projection tomography (OPT), magnetic resonance imaging (MRI) and micro-Computed Tomography scan (e.g., Heim and Nickel 2010, Błażejowski et al 2011, Görög et al 2012, Faulwetter et al 2013). The latter authors in particular have made a significant contribution in this field, suggesting that virtual specimens prepared by means of micro-CT scan may replace type specimens for some purposes.…”

Section: Introductionmentioning

confidence: 99%

Revolving SEM images visualising 3D taxonomic characters: application to six species of the millipede genus Ommatoiulus Latzel, 1884, with description of seven new species and an interactive key to the Tunisian members of the genus (Diplopoda, Julida, Julidae)

Akkari¹,

Cheung²,

Enghoff³

et al. 2013

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A novel illustration technique based on scanning electron microscopy is used for the first time to enhance taxonomic descriptions. The male genitalia (gonopods) of six species of millipedes are used for construction of interactive imaging models. Each model is a compilation of a number of SEM images taken consecutively while rotating the SEM stage 360°, which allows the structure in question to be seen from all angles of view in one plane. Seven new species of the genus Ommatoiulus collected in Tunisia are described: Ommatoiulus chambiensis, Ommatoiulus crassinigripes, Ommatoiulus kefi, Ommatoiulus khroumiriensis, Ommatoiulus xerophilus, Ommatoiulus xenos, and Ommatoiulus zaghouani spp. n. Size differences between syntopic adult males of Ommatoiulus chambiensis and Ommatoiulus xerophilus spp. n. from Châambi Mountain are illustrated using scatter diagrams. A similar diagram is used to illustrate size differences in Ommatoiulus crassinigripes, Ommatoiulus khroumiriensis spp. n. and Ommatoiulus punicus (Brölemann, 1894). In addition to morphological differences, the latter three species display allopatric distribution and different habitat preferences. A dichotomous interactive key with a high visual impact and an intuitive user interface is presented to serve identification of the 12 Ommatoiulus species so far known from Tunisia. Updates on the North African Ommatoiulus fauna in general are presented.

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Methodology of the micro-computer tomography on foraminifera

Cited by 24 publications

References 17 publications

Ontogenetic disparity in early planktic foraminifers

Ontogenetic disparity in early planktic foraminifers

Three Dimensional Models of Pyrgo Depressa (D’orbigny, 1826) (Foraminifera) Performed With Microtomography Techniques

Revolving SEM images visualising 3D taxonomic characters: application to six species of the millipede genus Ommatoiulus Latzel, 1884, with description of seven new species and an interactive key to the Tunisian members of the genus (Diplopoda, Julida, Julidae)

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