Stomatia phymotis, common name the swollen stomatella, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

The body whorl descends very deeply.

The shell is lusterless, red, marked at the suture, keel and base with olive or brown articulated with white.

The surface is very rough, with a strong double nodulous keel at the middle of the whorl, several nodose spiral riblets and threads below it, strongly.

[3] This marine species occurs in the Red Sea, Central and East Indian Ocean, East India, Indo-Malaysia, Oceania, the Philippines, Japan, Australia (Northern Territory, Queensland, Western Australia) and Indonesia.