Mytilids have been documented to attach byssal threads onto predatory
snails, potentially trapping them.  I don't know how far a Urosalpinx
can reach to prey on anything that settles on it.

On Mon, Dec 10, 2012 at 2:44 PM, Steve Rosenthal <[log in to unmask]> wrote:
> an offshoot from my earlier post this week....
> one interesting specimen from the last visit to welwyn....i have seen a
> number of oysters- Crassostrea virginica- that were growing on the spires
> of periwinkles- Littorina littorea, where they presumably settled as spat.
> Sometimes the periwinkle was alive and sometimes not, i would assume that
> after the oyster grows too big the periwinkle may no longer be able to move
> about or forage successfully.
>
> however on the last visit to this locality in the shell piles up on the
> beach i had a first- a small oyster around 20mm was growing out of the
> spire of a medium sized live oyster drill, Urosalpinx cinerea....possibly
> the only way an  oyster could turn the tables on the oyster drill?
>
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--
Dr. David Campbell
Visiting Professor
Department of Natural Sciences
Gardner-Webb University
Boiling Springs NC 28017

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