Listers,
I have a 3mm diameter trochid from the Gulf of Thailand.
It has a distinctive shape. Sort of like a jujube candy, or like the tip of a bullet that got sliced off.
In other words, it has a gently convex spire with shallow sutures, and a flat bottom. There's a distinct sulcus just under the periphery.
It's umbilicate.
Any ideas?
David Kirsh
Durham, NC