Seashell: Tooth Shell
This shell measures 2.5 cm. It is small but is rather thick and heavy. I bought this in Taiwan, 2003.
Note its ribbed shell. Although this small shell has only one 1 revolution, but its ribbed covering makes a beautiful multi-spiral pattern.
I think the nickname for this shell is some “tooth shell”.
If you know this shell's name, please comment or email.