Melatoma costata Swainson, 1840 Clionella costata is a species of sea snail, a marine gastropod mollusk in the family Clavatulidae.

[1][2] (Original description) The shell has a fusiform shape and is longitudinally ribbed.

There is a deep sinus at the top of the outer lip.

[3] The figure of the type, produced by Swainson, shows a shell with a tapering base, unlike any other species of Clionella.

This Clavatulidae-related article is a stub.