Janthina exigua, also known as the dwarf janthina, is a species of small holoplanktonic sea snail, a marine gastropod mollusk in the family Epitoniidae, the violet snails or purple storm snails.

[1] This species is pelagic, and occurs around the world in tropical waters, in other words it is circumequatorial.

[1] It has been recorded from: The maximum recorded shell length is 15.3 mm.

[2] Minimum recorded depth is 0 m.[2] Maximum recorded depth is 0 m.[2]