Stomatia decussata is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

[2] The ovate-oblong shell is longitudinally and transversely decussately striate, with two simple or subtuberculated angular, prominent carinae.

The shell is pale, varied with brown spots.

This species is decussated with transverse and longitudinal striae, and there are two prominent, angular, keels on the whorls.

[3] This marine species occurs off the Philippines and off Queensland, Australia