Onchidiopsis glacialis is a species of small sea snail with a transparent internal shell, a marine gastropod mollusk in the family Velutinidae.

Because the shell is mostly internal, the snail resembles a sea slug in general appearance.

[2] The distribution of Onchidiopsis glacialis includes European waters.

[2] The maximum recorded (shell?)

[3] The minimum recorded depth for this species is 4 m; maximum recorded depth is 300 m.[3]