Mollusca (Phylum) > Gastropoda (Class) > Caenogastropoda (Subclass) > Littorinimorpha (Order) > Tonnoidea (Superfamily) > Tonnidae (Family) > Tonna (Genus)

Channeled tun, Tonne canaliculée,

Synonymes
Bulla canaliculata (Linnaeus, 1758)
Cadium olearium (Linnaeus, 1758)
Cadus cepa (Röding, 1798)
Dolium (Dolium) cepa (Röding, 1798)
Dolium cepa (Martini, 1777)
Dolium marmoreum (Schröter in Martini, 1788)
Dolium olearium (Linnaeus, 1758)
Tonna (Tonna) canaliculata (Linnaeus, 1758)
Tonna (Tonna) cepa (Röding, 1798)
Tonna cepa (Röding, 1798)
Tonna planicostata (Dodge, 1956)

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Tonna canaliculata is a species of large sea snail, a marine gastropod mollusk in the family Tonnidae, the tun shells.

Description
Demersal; depth range 0 - 30 m. Max length : 14.5 cm ; common length : 11.0 cm.
Shell ovate, large, thin, hard, greatly expanded; whorls about seven in number; body whorl greatly expanded centrally, encircled by about 19 broad, closely set, flat, spiral ribs separated by comparatively narrow and shallow interspaces, marked at the sutures by a deep channel; columella reasonably straight, but slightly twisted; lip simple; color tawny yellow exteriorly, ribs lighter in color, grooves darker, body whorl becoming increasingly darker toward the lip ; length, 3 to 5 inches.

Distribution
Indo-West Pacific: from East Africa to Melanesia; north to Japan and south to southern Queensland. Reported from New Caledonia.

Biology
No precise data on fisheries, but the species is currently sold in markets in East Africa. Occurs at the low tide mark.