Scientists identified almost 1,500 new creatures in the world's oceans last year, including a humpbacked dolphin and a giant jellyfish, and reckon that most species of marine life are yet to be found.
The experts publishing their findings Thursday listed a total of 228,450 marine species worldwide, ranging from seaweeds to blue whales, and estimated that between 500,000 and 2 million more multicelled marine organisms were still unknown.
"The deep sea has been poorly explored so far," said Jan Mees, co-chair of the World Register of Marine Species (WoRMS).