Mysterious 'alien creature' with transparent head and 13 legs baffles deep sea diver

The strange animal appeared to sport a large jelly-like ball where its head should be, that seemed to be filled with spiky teeth.

Its legs, with a similar aesthetic to tentacles, stretched perpendicular to its long straight body, which also appeared to be covered in small suckers.

The incredible footage of the odd sea creature was filmed by a diver in Bali, who did not appear to have any idea what the alien-like fish could be.
But while it might have looked like it's from another planet, the creature is actually a sea slug - also known as Melibe viridis.

Sea slugs can grow to over 12cm in length, but their most fascinating attribute is the way they feed.

According to Sea Slug Forum , the creatures use their transparent heads as an 'oral veil' - or fishing net - to catch their prey.

When another sea creature touches the sensitive cells on the inside of the veil, it will contract rapidly, trapping the prey.