Calcite orientations and composition ranges within teeth across Echinoidea

Stuart R Stock*, Konstantin Ignatiev, Peter L. Lee, Jonathan D. Almer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Sea urchin's teeth from four families of order Echinoida and from orders Temnopleuroida, Arbacioida and Cidaroida were studied with synchrotron X-ray diffraction. The high and very high Mg calcite phases of the teeth, i.e. the first and second stage mineral constituents, respectively, have the same crystallographic orientations. The co-orientation of first and second stage mineral, which the authors attribute to epitaxy, extends across the phylogenic width of the extant regular sea urchins and demonstrates that this is a primitive character of this group. The range of compositions Δx for the two phases of Ca1-xMgxCO3 is about 0.20 or greater and is consistent with a common biomineralization process.

Original languageEnglish (US)
Pages (from-to)48-52
Number of pages5
JournalConnective tissue research
Issue numberSUPPL. 1
StatePublished - 2014


  • Biomineralization
  • Calcite
  • Sea urchin
  • Synchrotron radiation
  • Teeth
  • X-ray diffraction

ASJC Scopus subject areas

  • Rheumatology
  • Biochemistry
  • Orthopedics and Sports Medicine
  • Molecular Biology
  • Cell Biology


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