correct, thank you!

On 8/8/19, Susan Hewitt or Ed Subitzky <[log in to unmask]> wrote:
> A small point, but it is the tube feet of the sea urchins that the shells
> are stuck to, not the spines.
>
>> On Aug 7, 2019, at 5:09 PM, Steve Rosenthal <[log in to unmask]> wrote:
>>
>> It is well known  that wentletraps (Epitoniidae) are associated
>> ecologically and distributionally with sea anemones. Does anybody know if
>> there is any association between sea urchins and wentletraps?
>>
>> While collecting  shells over the weekend in SE Alaska  I stumbled upon a
>> population  of Boreoscala greenlandica (Perry, 1811) in spatial
>> association with bunches of green sea urchins (Strongylocentrotus
>> drobachiensis) in the lowermost intertidal/uppermost subtidal zone of the
>> rocky shoreline. Of the 100 or so live snails I saw, at least half were
>> actually 'stuck' on the spines of the sea urchins with their
>> apertures/opercula  facing upwards.  Almost all the other wentletraps I
>> saw were nearby on sediment or hard surfaces adjacent to (and often in
>> contact with) the urchins, while a few were crawling around in, or
>> partially buried in, bare patches of soft sediment nearby.  I didn't see
>> any of the snails  in any other microhabitat or bottom type in the areas I
>> explored.  Furthermore, I didn't notice any sea anemones in the areas
>> where  the urchins and the wentletraps were living.  I can't help but
>> wonder if there is an ecological association between these two species,
>> and then of course how did so many living wentletraps wind up 'stuck' on
>> the sea urchins, and what- if any- harm (or benefit) could result for the
>> snails as a consequence. It's well known that many species of sea urchins
>> will attach dead shells (especially bivalves), pebbles and other debris to
>> their spines to help disguise them from potential predators. Do they also
>> 'use' live shells? It sure looked like it.
>> Another thing i did notice was  the first low tide of that weekend  (a
>> minus 3.0)  was so low that the urchins were eventually exposed to the
>> air, and from that point onward,  could no longer find any wentletraps,
>>
>> Anybody ever seen anything like this or have any knowledge as to what was
>> going on?
>>
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