Liamorpha decorata is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.

[1][2][3] The shell has an oval conic shape.

The whorls of the teleoconch are decussated.

The lip is undulated by the spiral sculpture which appears on the columella, simulating two plications.

[4] This marine species occurs in the following locations:[1]