Jellyfish are strange, with of their body water they don't have a brain, all jelly fish have a squishy hemisphere for a head and deadly stingers that are directly below the head. The stingers kill fish, some jelly fish can kill or wound a human.
Larval Leaf Scorpionfish (photograph by Chris Newbert, Minden Pictures). Lacking any other defense, many larval fish have adapted transparency as a method of camouflage—such as this tiny, see-through larval leaf scorpionfish in Hawaii.
Last week, the IUCN 2009 Seamount expedition ended, with scientists sampling two final seamounts in the Indian Ocean. Caught at was this deep-sea anglerfish, also known as a seatoad. Sarah Gotheil From BBC news
The aptly named Ping-pong tree sponge (Chondrocladia lampadiglobus) is a carnivorous sponge. Those ping-pong ball looking things are covered in tiny spicules which the sponge uses to catch tiny crustaceans.