Conchologists and Malacologists,
How are spines formed in mollusc shells?  Is there a body part that pushes
the calcite or aragonite up?  Is there a difference in the calcite or
aragonite structure of spines compared to the structure of the rest of the
shell?

I have been searching this subject for a while and there seems to be no
literature examining spine formation in molluscs.

Thank you,
A. Spring
PhD student of marine biology

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