What is the name of this swimming sea slug that has a luminous glow, translucent skin, and wings that are actually its feet?

The sea angel is a small type of swimming sea slug with translucent and luminous skin and wings that are actually its feet. They can be found in polar regions beneath the ice, and they have also been found in equatorial areas.

Asked by Jason Forbes · Last updated 5 years ago · 7.8K views · SOURCE