Rare earth elements (REEs) in vertebrate microremains from the upper Pridoli Ohesaare beds of Saaremaa Island, Estonia: geochemical clues to palaeoenvironment c

Žigaitė, Živilė; Fadel, Alexandre; Blom, Henning; Pérez‐Huerta, Alberto; Jeffries, Teresa; Maerss, Tiiu; Ahlberg, Per

doi:10.3176/earth.2015.21

Cited by 9 publications

(3 citation statements)

References 29 publications

(59 reference statements)

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“…geochemical analysis. Classical chemical analyses or more complex analyses as stable isotopes and rare earth elements could be helpful for reconstruction of the palaeoenvironment (Clementz 2012;Kowal-Linka and Bodzioch 2017;Tütken et al 2006Tütken et al , 2008Zigaite et al 2015). By applying a precise sampling and measurement of chemical elements to each Histotype, or even single zone and annulus, the identification of different environmental settings would be possible, which cannot be observed by petrographic analyses (Bodzioch and Kowal-Linka 2012).…”

Section: Discussionmentioning

confidence: 99%

Variability of growth pattern observed in Metoposaurus krasiejowensis humeri and its biological meaning

2017

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Purpose Histological studies on temnospondyl amphibian bones remain rare. A systematic revision of the histology was applied for the purpose of testing the histovariability in the humeri and becoming new information about the growth pattern. Methods The present study includes 12 humeri of Metoposaurus krasiejowensis, which originate from the Late Triassic clay pit near Krasiejów, southwestern Poland. The specimens were scanned with a microCT and the histological thin-sections have been obtained with the standard petrographic method. Results The evaluation of the studied bones shows a uniform growth series resulting in one morphotype. Strikingly, the histological analysis reveals a greater diversity with two different histotypes: Histotype I shows a distinct differentiation between alternating zones and annuli with poor to moderate vascularization and increase of bone remodeling during growth. Histotype II does not show any distinct zones and annuli but is characterized by a high vascularization and fast growth coexisting with an extensive bone remodeling. Conclusions Based on these two different growth patterns, several hypotheses can be established: The specimens do not show any pattern of histological variation; humeri represent a taxonomic diversity; the analyzed Metoposaurus bones stem from two different populations separated by space and; or time or sexual dimorphism.

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Section: Discussionmentioning

confidence: 99%

Variability of growth pattern observed in Metoposaurus krasiejowensis humeri and its biological meaning

2017

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“…Diagenetic effects on fossil bone can lead to an enrichment in middle REEs (Žigaitė et al . 2015). However, the REE compositions of the analysed recrystallized bone apatite from Ophiderpeton brownriggii NMI.F16850 (Fig.…”

Section: Discussionmentioning

confidence: 99%

Metamorphism as the cause of bone alteration in the Jarrow assemblage (Langsettian, Pennsylvanian) of Ireland

et al. 2022

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“…The material was collected from the upper Pridoli Ohesaare Cliff beds (Žigaitė et al, 2015) in large limestone blocks that were chemically prepared using a weak solution of acetic acid in water (pH 3.65) at the fossil preparation laboratory at Lund University, Sweden. Published material from this project is held at the GIT in Estonia and the rest of the material is housed at the Evolution Museum at Uppsala University, Sweden.…”

Section: Methodsmentioning

confidence: 99%

Three-dimensional paleohistology of the scale and median fin spine ofLophosteus superbus(Pander 1856)

Jerve

Sanchez

et al. 2016

PeerJ

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Lophosteus superbus is one of only a handful of probable stem-group osteichthyans known from the fossil record. First collected and described in the late 19th century from the upper Silurian Saaremaa Cliff locality in Estonia, it is known from a wealth of disarticulated scales, fin spines, and bone fragments. In this study we provide the first description of the morphology and paleohistology of a fin spine and scale from Lophosteus using virtual thin sections and 3D reconstructions that were segmented using phase-contrast synchrotron X-ray microtomography. These data reveal that both structures have fully or partially buried odontodes, which retain fine morphological details in older generations, including sharp nodes and serrated ridgelets. The vascular architecture of the fin spine tip, which is composed of several layers of longitudinally directed bone vascular canals, is much more complex compared to the bulbous horizontal canals within the scale, but they both have distinctive networks of ascending canals within each individual odontode. Other histological characteristics that can be observed from the data are cell spaces and Sharpey’s fibers that, when combined with the vascularization, could help to provide insights into the growth of the structure. The 3D data of the scales from Lophosteus superbus is similar to comparable data from other fossil osteichthyans, and the morphology of the reconstructed buried odontodes from this species is identical to scale material of Lophosteus ohesaarensis, casting doubt on the validity of that species. The 3D data presented in this paper is the first for fossil fin spines and so comparable data is not yet available. However, the overall morphology and histology seems to be similar to the structure of placoderm dermal plates. The 3D datasets presented here provide show that microtomography is a powerful tool for investigating the three-dimensional microstructure of fossils, which is difficult to study using traditional histological methods. These results also increase the utility of fin spines and scales suggest that these data are a potentially rich source of morphological data that could be used for studying questions relating to early vertebrate growth and evolution.

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Rare earth elements (REEs) in vertebrate microremains from the upper Pridoli Ohesaare beds of Saaremaa Island, Estonia: geochemical clues to palaeoenvironment c

Cited by 9 publications

References 29 publications

Variability of growth pattern observed in Metoposaurus krasiejowensis humeri and its biological meaning

Variability of growth pattern observed in Metoposaurus krasiejowensis humeri and its biological meaning

Metamorphism as the cause of bone alteration in the Jarrow assemblage (Langsettian, Pennsylvanian) of Ireland

Three-dimensional paleohistology of the scale and median fin spine ofLophosteus superbus(Pander 1856)

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