0000000001308481

AUTHOR

Manuel Guizar-sicairos

showing 3 related works from this author

Critical appraisal of tubular putative eumetazoans from the Ediacaran Weng'an Doushantuo biota

2015

Molecular clock analyses estimate that crown-group animals began diversifying hundreds of millions of years before the start of the Cambrian period. However, the fossil record has not yielded unequivocal evidence for animals during this interval. Some of the most promising candidates for Precambrian animals occur in the Weng'an biota of South China, including a suite of tubular fossils assigned to Sinocyclocyclicus, Ramitubus, Crassitubus and Quadratitubus, that have been interpreted as soft-bodied eumetazoans comparable to tabulate corals. Here, we present new insights into the anatomy, original composition and phylogenetic affinities of these taxa based on data from synchrotron radiation …

1001ChinaFossils70Eukaryota610 Medicine & healthDoushantuo1100 General Agricultural and Biological Sciences144CyanobacteriaInvertebrates170 Ethics2300 General Environmental ScienceEdiacaran1300 General Biochemistry Genetics and Molecular Biologyexceptional fossilization2400 General Immunology and Microbiologytubular fossilsAnimals10237 Institute of Biomedical EngineeringDoushantuo; Ediacaran; Tubular fossils; Exceptional fossilizationResearch ArticlesBody PatterningProceedings of the Royal Society B: Biological Sciences
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X-ray nanotomography and electron backscatter diffraction demonstrate the crystalline, heterogeneous and impermeable nature of conodont white matter

2021

Conodont elements, microfossil remains of extinct primitive vertebrates, are commonly exploited as mineral archives of ocean chemistry, yielding fundamental insights into the palaeotemperature and chemical composition of past oceans. Geochemical assays have been traditionally focused on the so-called lamellar and white matter crown tissues; however, the porosity and crystallographic nature of the white matter and its inferred permeability are disputed, raising concerns over its suitability as a geochemical archive. Here, we constrain the characteristics of this tissue and address conflicting interpretations using ptychographic X-ray-computed tomography (PXCT), pore network analysis, synchro…

Earth and Environmental ScienceMultidisciplinaryMineralPaleozoicbiologycSAXSScienceEBSDOcean chemistryQMineralogyconodont white matterbiology.organism_classificationWhite mattermedicine.anatomical_structurePercolationptychographic nanotomographymedicineConodontX-ray tomographyChemical compositionResearch ArticlesGeologyElectron backscatter diffractionRoyal Society Open Science
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Table S1. from X-ray nanotomography and electron backscatter diffraction demonstrate the crystalline, heterogeneous and impermeable nature of conodon…

2021

Quantification and pore distribution derived from the Pore Network analysis of a cross section of the cusp of the eucondont Teriodontus nakamurai.

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