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

[1] The whitish, somewhat shining shell is smooth and pellucid.

The whorls of the teleoconch are plano-convex, strongly longitudinally costate, and with punctate interstices.

The columella is uniplicate in the middle.

[2] This marine species occurs in the Red Sea, off the Philippines and off Japan.