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

[1][2] The shell can grow to be 12 mm to 28 mm in length.

[3] Altrix trifolium can be found off of Yucatán, Colombia, and Barbados.

It lives at a depth of 256 m to 1170 m.[3][4]

This Fissurellidae-related article is a stub.