ECB-ART-43585
Connect Tissue Res
2014 Aug 01;55 Suppl 1:48-52. doi: 10.3109/03008207.2014.923865.
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Calcite orientations and composition ranges within teeth across Echinoidea.
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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.
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Genes referenced: LOC100887844
References [+] :
Ma,
The grinding tip of the sea urchin tooth exhibits exquisite control over calcite crystal orientation and Mg distribution.
2009, Pubmed,
Echinobase