A very rare sea slug - Trinchesia sp. The body length of this creature is only 5 mm (!), the photo was taken at a depth of 22 m. Tulamben, Bali, Indonesia.

A very rare sea slug - Trinchesia sp. The body length of this creature is only 5 mm (!), the photo was taken at a depth of 22 m. Tulamben, Bali, Indonesia.