In my experience, most if not all shells, are nocturnal. Sand dwellers, like
Marginella like to pop out of the sand at night on the incoming tide to see
what goodies have arrived. The rest of the time they usually remained buried
and fairly inactive.
 
One of the most beautiful sights I've seen is an exposed reef on a minus tide
at night. It is alive with activity. There are some reefs that only become
exposed a few times a year, on the minus tides. Enough for now, makes me wish
I were back there with my carbide lamp.
 
Frank Walker
Gems From The Sea
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