Skeletal chemistry of Nautilus and its taxonomic significance |
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| Institution: | 1. School of Mathematical Sciences, University of Nottingham, UK;2. Department of Mathematics and Statistics, Lancaster University, UK;3. School of Mathematics and Statistics, Newcastle University, UK;1. Department of Mechanical Engineering, University of Colorado Boulder, CO 80309-0427, USA;2. Materials Science and Engineering Program, University of Colorado Boulder, CO 80309-0427, USA;1. Engineering Chemistry Department, High Institute of Engineering & Technology, New Damietta, Egypt;2. Al-Qunfudah Center for Scientific Research (QCSR), Al-Qunfudah University College, Umm Al-Qura University, Saudi Arabia;3. Ministry of Health, Domyat Laboratory, Damietta, Egypt |
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| Abstract: | The strontium (Sr) and magnesium (Mg) chemistry of the shell wall and septum as well as the spherulitic-prismatic and nacreous layers of these structures was determined for Nautilus species: N. belauensis, N. macromphalus, N. pompilius and N. scrobiculatus. Each species of Nautilus exhibits greater variability and higher concentrations of Mg in juvenile portions of the shell than in more mature portions of the shell. This decrease in the variability and amount of Mg in the aragonite lattice suggests a physiochemical system which becomes more efficient with time relative to carbonate production. Statistically significant differences in the Sr and Mg content of spherulitic-prismatic and nacreous layers of the shell and septum indicate that these layers were formed from extracellular fluids of different compositions. Concentrations of Sr and Mg in aragonite of the shell wall are characteristic for each species and sufficiently invariant within species to allow species of Nautilus to be distinguished statistically on the basis of either the Sr or Mg content of the shell wall or the Mg content of septa. |
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