Sea angel

Not to be confused with angel sharks

Sea angels (clade Gymnosomata) are a large group of extremely small, swimming sea slugs, not to be confused with Hydrozoans (Jellyfish and other similar creatures), classified into six different families. They are pelagic opisthobranchs in the clade Gymnosomata within the larger clade Heterobranchia. Sea angels were previously referred to as a type of pteropod. The appear as though they are tiny little angels flying through the sea, hence the name sea angels.