Hi folks,
With regard to calcium secretors of a secondary nature at least, you
could probably add a few of the polydorids (Spionidae) that are
commensals with hermit crabs.
Dipolydora commensalis (Andrews) and Polydora bioccipitalis Blake and
Woodwick excavate a channel along the columella of gastropod shells
occupied by hermit crabs. The excavated material is then redeposited as a
thin calcareous ceiling over the burrow. Somehow, the worm reworks the
Calcium carbonate that is removed from the gastropod shell and then
redeposits the stuff. I also think that another one of my beasties, D.
antonbrunnae (Blake) from Peru does the same thing.
Cheers,
Jim Blake
(jablake at ix.netcom.com)
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