Tonna dunkeri, common name boxing glove, is a species of large sea snail, a marine gastropod mollusk in the family Tonnidae, the tun shells.

The surface is sculpted with well-developed, broad, flat-topped spiral cords, and the base has a pronounced siphonal notch.

On the Agulhas Bank, shells tend to be more globular, with a lower spire, a pronounced shoulder, and a slightly sunken suture.

The ribs are marked with irregular white blotches, bordered by darker brown bars.

[3] This marine species occurs off South Africa, off the Agulhas Bank and East coast at depths between 50 m and 100 m; also off Madagascar.