Ariadnaria borealis, common name the boreal hairysnail, is a species of small sea snail, a marine gastropod mollusk in the family Capulidae, the cap snails.

[1] This species occurs in the North Sea, the Canadian part of the Arctic Ocean, in the Northwest Atlantic Ocean.

The maximum recorded shell length is 22 mm.

[2] Minimum recorded depth is 2 m.[2] Maximum recorded depth is 574 m.[2]

This Capulidae-related article is a stub.