Agathotoma neglecta is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

[2] (Original description) The shell is subfusiform and pale brownish-red, with each whorl featuring eight or nine prominent curved ribs.

The apex is acute, and the spire has moderately convex outlines.

The outer lip is significantly thickened both inside and out, with a narrow sinus.

[3] This species occurs in the Pacific Ocean off Panama and Mexico.