Black and Yellow Banded Tun Shell Art on Canvas in a Black Bijou Frame.

The Tonnidae are a family of medium-sized to very large sea snails that live in these tun shells. The name tun refers to the snails' shell shape, which resembles wine caskets known as "tuns". These shells are thin, but are strong.

They are found in all tropical seas, where they inhabit sandy areas. During the day, they bury themselves in the substrate, emerging at night to feed on sea cucumbers, crustaceans, and bivalves. Some larger species also capture fish, using their expandable probosces to swallow them whole. Females lay rows of eggs that become free-swimming larvae for several months before settling to the bottom.

If you are a conchologist (collector and student of shells) we would love to hear from you about how you would improve this description.