It’s easy to see why the aquatic creature in this photo is commonly called a sea angel. It has gossamer-like “wings” that flutter gently and help it swim, and its diaphanous body gives it an otherworl...It’s easy to see why the aquatic creature in this photo is commonly called a sea angel. It has gossamer-like “wings” that flutter gently and help it swim, and its diaphanous body gives it an otherworldly appearance. Although it appears angelic, this tiny invertebrate is actually a vicious predator.