Stomatolina rubra
Stomatolina rubra, common name the red stomatolina, is a species of small sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Description. The size of the shell varies between 8 mm and 18 mm. The depressed, rather thin shell has a small, conical spire. It is reddish brown, lighter beneath, or variously variegated. The surface is covered with close fine hair-like spiral striae, and with two low keels above the periphery, the upper one nodose. There is a series of short folds below the suture. The whorls of the spire contain a beaded  carina. The wide body whorl is depressed, flattened above, convex below, and impressed at the axis. The large aperture is rounded, very oblique, and iridescent within. Distribution. This marine species occurs in the tropical Indo-West Pacific and off Korea, the Philippines and Australia (Northern Territory, Queensland, Western Australia)