Frilled Shark: Looking like a cross between a shark and anaconda this species have known to be mistaken for sea serpents. Cannot really blame people for the confusion as they do have a body like snake and teeth that are really sharp. They live in all parts of the ocean but rarely come above 400 feet in depth. This creature has strong teeth and jaws to kill most fishes but mostly eat boneless creatures like squid. This creature too is facing extinction due to the fishing industry.
Viperfish: This has to be one of the scariest looking fish ever with its teeth so big that they do not fit in the mouth. When the jaw is closed the bottom jaw juts out and the teeth will come up to the forehead. As these fish live below 250 feet depth and below that luckily the chances of a sudden encounter are less.
Sea Spider: This one is actually a crab that has the look of a spider and can weigh up to 10 pounds can grow up to 3 feet.
Pitcher Plant: Though not an animal it is difficult not see it as one as it can even eat mice. It draws its prey by secreting a nectar that draw the prey due to the smell, but is so acidic that the prey will disintegrate in a matter of hours.
Human Botfly: This one is disgusting as once you are bitten by this creature a maggot of about 3 quarters of an inch and half an inch in width will come out of your skin. The way this fly reproduces is really horrifying.