Australian Box Jellyfish is very dangerous Jellyfish and scary in appearance as well. It is transparent and difficult to see it through naked eye. It is poisonous Jellyfish of the world and faster in motion as well.
Marine Census Medusa A new species of hydromedusae, Bathykorus bouilloni, common below feet meters). Hundreds of these creatures were observed by a remotely operated vehicle in the Arctic, showing that a new species can be common in a habitat.