Taranis mayi is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

These whorls are convex and appear smooth to the naked eye, but under the microscope, they reveal very fine spiral lirae and interstitial punctation.

The spire whorls are convex, sharply angulate at the middle with a distinct cord, and the base is contracted, forming a moderately long siphonal canal that curves slightly to the left.

The aperture is obliquely oval, with a thin, simple outer lip that is ridged externally by the spirals.

On the body whorl there are eighteen spirals — subdistant just below the angle and becoming more crowded toward the siphonal canal.