Originally Posted by wax32
There are lots of different species of Trochus snails, most have bands like the one in my picture, but some don't. You can usually tell them apart from Astraea snails by looking at their foot... most Astraea snails are cream to greyish and Trochus are more black. Trochus also move WAY faster and are usually, but not always, nocturnal. Trochus shells are usually pointier looking, almost like a perfect pyramid or turban shape, Astraea are more like a longish cone.
Well that almost fits my mystery snail perfect then. He is nocturnal and has blackish skin. , How big to they get? I'll run a few searchs now.