Altrix trifolium

Altrix trifolium is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets.

Description
The shell can grow to be 12 mm to 28 mm in length.

Distribution
Altrix trifolium can be found off of Yucatán, Colombia, and Barbados. It lives at a depth of 256 m to 1170 m.