Tonna tankervillii is a very large species of sea snail or tun snail, a marine gastropod mollusc in the family Tonnidae, the tun shells. Distribution This species is found in Australia, from Torres Strait in the north, down the east coast, and also on the northeast coast of New Zealand. Shell description The shell height is up to 23 cm, and width 19 cm. References External links ZipCodeZoo Tonnidae Gastropods described in 1860 Taxa named by Sylvanus Charles Thorp Hanley