Onchidiopsis glacialis
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. Distribution. The distribution of "Onchidiopsis glacialis" includes European waters. Description. The maximum recorded (shell?) length is 18 mm. Habitat. The minimum recorded depth for this species is 4 m; maximum recorded depth is 300 m.