Ithycythara lanceolata, common name the spear mangelia, is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

It is brownish, more or less tinged with purple, with fine spiral lines of white and of dark brown, which are more conspicuous on the ribs; with a darker and wider brown line along the suture.

There is a spiral elevated line, on the middle of the whorls, which is obsolete in the intercostal spaces and has nodtdous intersections with the ribs.

The shell contains 8 whorls, scarcely convex, with a lightly impressed suture.

[2] I. lanceolata can be found in Atlantic waters, ranging from the eastern coast of Florida south to Brazil.