Antiguraleus infandus is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

(Original description) The shell is white and chalky.

Strong spirals cross the ribs, two on the second whorl, three above the aperture, a fourth and faint fifth on the body-whorl.

The type is worn—the protoconch damaged, and the outer lip broken away for a quarter of a whorl.

[2] This marine species occurs off Great Barrier Island, New Zealand.