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A modern scleractinian coral with a two-component calcite-aragonite skeleton.
Stolarski, Jaroslaw; Coronado, Ismael; Murphy, Jack G; Kitahara, Marcelo V; Janiszewska, Katarzyna; Mazur, Maciej; Gothmann, Anne M; Bouvier, Anne-Sophie; Marin-Carbonne, Johanna; Taylor, Michelle L; Quattrini, Andrea M; McFadden, Catherine S; Higgins, John A; Robinson, Laura F; Meibom, Anders.
Afiliação
  • Stolarski J; Institute of Paleobiology, Polish Academy of Sciences, PL-00-818 Warsaw, Poland; stolacy@twarda.pan.pl.
  • Coronado I; Faculty of Biological and Environmental Sciences, University of Leon, 24171 Leon, Spain.
  • Murphy JG; Department of Geosciences, Princeton University, Princeton, NJ 08544.
  • Kitahara MV; Marine Science Department, Federal University of São Paulo, 11070-100 Santos (SP), Brazil.
  • Janiszewska K; Centre for Marine Biology, University of São Paulo, 11612-109 São Sebastião (SP), Brazil.
  • Mazur M; Institute of Paleobiology, Polish Academy of Sciences, PL-00-818 Warsaw, Poland.
  • Gothmann AM; Department of Chemistry, University of Warsaw, PL-02-093 Warsaw, Poland.
  • Bouvier AS; Department of Environmental Studies, St. Olaf College, Northfield, MN 55057.
  • Marin-Carbonne J; Department of Physics, St. Olaf College, Northfield, MN 55057.
  • Taylor ML; Center for Advanced Surface Analysis, Institute of Earth Sciences, Université de Lausanne, CH-1015 Lausanne, Switzerland.
  • Quattrini AM; Center for Advanced Surface Analysis, Institute of Earth Sciences, Université de Lausanne, CH-1015 Lausanne, Switzerland.
  • McFadden CS; School of Life Sciences, University of Essex, Wivenhoe Park, CO4 3SQ Colchester, United Kingdom.
  • Higgins JA; Department of Invertebrate Zoology, Smithsonian Institution, Washington, DC 20560-0163.
  • Robinson LF; Department of Biology, Harvey Mudd College, Claremont, CA 91711.
  • Meibom A; Department of Biology, Harvey Mudd College, Claremont, CA 91711.
Proc Natl Acad Sci U S A ; 118(3)2021 01 19.
Article em En | MEDLINE | ID: mdl-33323482
ABSTRACT
One of the most conserved traits in the evolution of biomineralizing organisms is the taxon-specific selection of skeletal minerals. All modern scleractinian corals are thought to produce skeletons exclusively of the calcium-carbonate polymorph aragonite. Despite strong fluctuations in ocean chemistry (notably the Mg/Ca ratio), this feature is believed to be conserved throughout the coral fossil record, spanning more than 240 million years. Only one example, the Cretaceous scleractinian coral Coelosmilia (ca. 70 to 65 Ma), is thought to have produced a calcitic skeleton. Here, we report that the modern asymbiotic scleractinian coral Paraconotrochus antarcticus living in the Southern Ocean forms a two-component carbonate skeleton, with an inner structure made of high-Mg calcite and an outer structure composed of aragonite. P. antarcticus and Cretaceous Coelosmilia skeletons share a unique microstructure indicating a close phylogenetic relationship, consistent with the early divergence of P. antarcticus within the Vacatina (i.e., Robusta) clade, estimated to have occurred in the Mesozoic (ca. 116 Mya). Scleractinian corals thus join the group of marine organisms capable of forming bimineralic structures, which requires a highly controlled biomineralization mechanism; this capability dates back at least 100 My. Due to its relatively prolonged isolation, the Southern Ocean stands out as a repository for extant marine organisms with ancient traits.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Calcificação Fisiológica / Carbonato de Cálcio / Antozoários / Exoesqueleto Limite: Animals Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Calcificação Fisiológica / Carbonato de Cálcio / Antozoários / Exoesqueleto Limite: Animals Idioma: En Ano de publicação: 2021 Tipo de documento: Article