This deep-sea dweller has a different appearance outside of water (which is how it is pictured above). It has been voted the world's ugliest animal at least once due to being presented in its decompressed state. But even in its natural habitat, while looking less like a melting monster, it still isn't easy on the eyes.
The “devil worm” (as it has been dubbed) was first described as a mass of moving black swirls when it was first discovered in 2011. It has evolved to withstand tremendous heat and pressure, which makes sense when you consider it was found nearly two miles beneath the earth's surface.
The naked mole rat gets a lot of flak for being the ugliest mole, but we think its star-nosed counter part has it beat hands down. Twenty-eight flesh feelers extend from its snout to help it measure and detect its surroundings. It's a cool feature to be sure, but it looks like something out of a Lovecraft story.
Japanese Spider Crab
The aptly-named spider crab grows larger than your standard spiders or crabs, with an average leg span of sixteen feet. Despite it's seemingly frail appearance it's known to cause very serious injuries to the fishermen who mishandle it.
A rare sight to be sure, the giant jellyfish has a tentacle reach of over one-hundred feet. Though its sting isn't deadly to humans (and encounters with humans aren't common at all), it remains active for some time after dismemberment. An incident in 2010 saw pieces of the jellyfish affect over one-hundred people.