Tonnidae
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The Tonnidae are a family of medium-sized to very large sea snails, known as the tun shells. These are marine gastropod molluscs in the clade Littorinimorpha. The name tun refers to the snails' shell
Tonna tankervillii
Littorinimorpha
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Littorinimorpha is a large order of snails, gastropods, consisting primarily of sea snails, but also including some freshwater snails and land snails.
Tonnidae
…The Tonnidae are a family of medium-sized to very large sea snails, known as the tun shells. These are marine gastropod molluscs in the clade Littorinimorpha. The name tun refers to the snails' shell shape, which resembles wine casks known as "tuns". While thin, the shells are also strong and lack opercula…
Different cowries
Calyptraea chinensis (Calyptraeidae)
Cypraea tigris (Cypraeidae)
Ovula ovum (Ovulidae)