Type: Sea cucumber

Details: Its name makes it sound like a piece of sexy lingerie, but don't be fooled: The pink see-through fantasia is a sea cucumber, found about a mile and a half deep in the Celebes Sea in the western Pacific (east of Borneo).

Type: Shark

Details: The frilled shark is one of the gnarliest looking creatures in the sea. If it looks like an ancient beast that's because it kind of is; Mental Floss reports that frilled sharks "have changed so little since prehistoric times."

Type: Worm

Details: Found in the Celebes Sea, this worm is, well ... this worm seems confused. Scientists call it a squidworm. (No, not Squidward.)

Type: Lobster, crab, or other crustacean

Details: These guys are native to chilly, deep waters and can grow to be quite large; in 2010, a giant isopod measuring 2.5 feet was discovered by a remotely operated underwater vehicle. Giant isopods are carnivores who usually make due with dead animals that fall down from the ocean's surface. It's believed that they grow so large in order to withstand the pressure at the bottom of the sea.

Type: Worm

Details: Scientists found this strange creature at the Great Barrier Reef's Lizard Island and named it, aptly, the Christmas tree worm. One better might have been "fake plastic Christmas tree worm," but it's still a pretty good name. (Scientists also refer to it as Spirobranchus giganteus). The spiral "branches" are actually the worm's breathing and feeding apparatus. The worm itself lives in a tube, and it can withdraw its tree-like crowns if threatened.

Type: Snail or slug

Details: We wouldn't be surprised to find that sea angels are in the same family as, say, the mythological Sirens. They're called angels, but are actually a predatory sea snail. This particular specimen, Platybrachium antarcticum, "flies through the deep Antarctic waters hunting the shelled pteropods (another type of snail) on which it feeds," according to the Marine Census of Life.

Type: Eel or fish

Details: The gulper eel (also referred to as the pelican eel) was aptly named thanks to its massive mouth and jaw. Gulper eels can grow up to six feet in length and their huge mouths allow them to eat prey that is sometimes larger than them. This usually happens when food is scarce and it's believed that gulper eels usually eat crustaceans and other small marine animals.

Type: Jellyfish

Details: Like a multi-stage rocket, this bizarre microscopic creature, Marrus orthocanna is made up of multiple repeated units, including tentacles and multiple stomachs. Never heard of a physonect siphonophore? That's what this is. It's something like a jellyfish, and is more closely related to the Portugese man o'war. One interesting thing about it: Like ants, a colony made up of many individuals has attributes resembling a single organism.

Type: Lobster, crab, or other crustacean

Details: A virus? An alien? Nope. It's a Munnopsis isopod crustacean, and even scientists haven't figured out more than that about this deep Southern Ocean denizen, yet. Isopods are ancient creatures (they've been on Earth, in one form or another, for 300 million years or so). They have seven pairs of legs and on land, you might be familiar with their cousins, the pill bugs. Nothing on land (and little in water) looks like this guy, though.

Type: Eel or fish

Details: This peculiar looking fish is also known as the Galapagos batfish and can be found at the bottom of the ocean. Although the red-lipped batfish appears to have legs, the limb-like appendages are actually fins which the creature uses to stand upon and check out its surroundings.

Type: Snail or slug

Details: There's no other snail in the world armored like the Crysomallon squamiferum, which was found over a hydrothermal vent deep in the Indian Ocean. The multilayered structure of the shell is called "unlike any other known natural or synthetic engineered armor."

Type: Octopus or squid

Details: One of the few known octopods known to be bioluminescent (glow with its own light) this Stauroteuthis syrtensis octopus was found about a half mile deep in the Gulf of Maine. Photophores (light-emitting organs) may be positioned to fool prey into swimming right into the mouth of the hunter.

Type: Snail or slug

Details: With a name like Flamingo tongue snail, and the flamboyant coloration to match, you might think that this Cyphoma gibbosum has a shell worthy of collecting. Not so. All its color comes from the soft parts of its body, which envelope its shell unless it's threatened. This specimen was photographed feeding on soft corrals near Grand Cayman in the British West Indies.

Type: Octopus or squid

Details: It lives in Monterey Bay and is called the vampire squid (and it appears to deserve the name). What else do you need to know?

Type: Eel or fish

Details: Found along the southwestern coast of Australia, the leafy seadragon, Phycodurus eques, uses its fins not only to propel it through the water, but as camouflage to resemble a piece of drifting seaweed.

Type: Eel or fish

Details: Scientists call this fish Psychrolutes microporos, but also, more directly, "Fathead."

Type: Jellyfish

Details: Crossota norvegica, a jellyfish, collected from the deep Arctic Canada Basin.

Type: Lobster, crab, or other crustacean

Details: This furry-clawed crab appeared so unusual when scientists discovered it 5,000-feet deep on a hydrothermal vent south of Easter Island that they designated it not only a new genus, Kiwa, but a new family, Kiwidae – both named for the mythological Polynesian goddess of shellfish. It's likely blind and may use bacteria in its furry claws to de-toxify its food.

Type: Worm

Details: What do you get when a whale dies at sea? (It's not a joke or riddle.) You get a feast, if you're a polychaete worm like this newly discovered Vigtorniella found a about a half mile down on the floor of Sagami Bay, Japan.

Type: Lobster, crab, or other crustacean

Details: Named Dinochelus ausubeli for its "terrible or fearful" (dinos in Greek) claws (chela) this new species of blind lobster joins a very small list of cousins in sthe genus Thaumastochelopsis. Only four other individuals, in two species, had been found previously, both in Australia. The specimen was collected during the Aurora mission in 2007 led by the U.S. and French natural history museums, and the Philippines Bureau of Fisheries and Aquatic Resources. That second part of its name, ausubeli is also significant: It's in honor of Jesse Ausubel, a co-founder of the Census of Marine Life.

Type: Lobster, crab, or other crustacean

Details: Found in the Antarctic, this male pycnogonid spider (or a distant relative of a spider, anyway) is bearing its own eggs.

Type: Octopus or squid

Details: This Grimpoteuthis octopus found over the Mid-Atlantic Ridge, is affectionately called Dumbo because of the way it flaps its ear-like fins to swim.

Type: Jellyfish

Details: This hydromedusa, Bathykorus bouilloni, is common in the deep waters of the Arctic, about 3,300-feet deep. No one knew it, until robotic submarines investigated, though.

Type: Snail or slug

Details: Something like a snail without a shell, nudibranch molluscs are known for their bright colors. This golden lace nudibranch, Halgerda terramtuentiss, was collected in the waters of the Northwestern Hawaiian Islands.

Type: Snail or slug

Details: Another hydrothermal vent snail, this Alviniconcha snail was found at the Suiyo Seamount of the Tokyo Hydrothermal Vent. It's the only individual of its kind ever discovered.

Type: Lobster, crab, or other crustacean

Details: These giant crabs are, as their name indicates, native to Japan and are considered delicacies throughout the country. These guys can grow to be up to 12 feet long and they are not picky eaters. In fact, the Japanese Spider Crab is believed to favor eating the bodies of other marine animals because it means they don't have to kill anything themselves.

Type: Lobster, crab, or other crustacean

Details: This newly discovered species of crustaceans known for its delicate claws, Leptocheliidae sensu lato, was found near the Great Barrier Reef's Lizard Island.

Type: Octopus or squid

Details: Another striking specimen discovered by the Marine Census of Life at the Great Barrier Reef's Lizard Island was this octopus.

Type: Lobster, crab, or other crustacean

Details: One of many new amphipods discovered by the Marine Census of Life, this Lysianassoid amphipod inhabits the waters near Elephant Island in the Antarctic. Like other tiny crustaceans, amphipods are a big source of food for larger creatures of the deep.

Type: Lobster, crab, or other crustacean

Details: This potentially new species of Metapseudes was found in abundance among the coral rubble at Ningaloo, Western Australia. What is it, exactly? Well, it's an arthropod, meaning it's somewhat related to insects, crustaceans, spiders, scorpions, and centipedes. Of course, that's not saying much, since there are more arthropod species on Earth than all other phyla combined.

Type: Eel or fish

Details: You can't really beat the description of this creature from the Census of Marine Life: "Exceeding two meters in length, the Napoleon Wrasse (Cheilinus undulatus) is one of the largest reef fish found in the warm waters of the Indian and Pacific oceans. The intricate blue-green design that decorates the face resembles New Zealand Maori war paint, which is the root of its alternative name, the Maori Wrasse. The designs are also unique to each individual, much like fingerprints. A protogynous hermaphrodite, this wrasse can change its sex from female to male."

Type: Jellyfish

Details: The image of swarms of sea nettles like these Chrysaora fuscescens in Monterey Bay, California, is so intense that they've been bred for aquariums. They do have a sting, though it's rarely a health risk for humans.

Type: Shark

Details: Goblin sharks are the stuff of nightmares. The super rare creature can grow up to 15 feet in length and has the ability to thrust is whole jaw outwards in order to capture prey. Mental Floss calls it a "deep sea vresion of Hungry Hungry Hippos," and honestly, we couldn't have said it better ourselves. Less than 50 goblin sharks have been seen since 1898, so if you're hoping to see one, chances are slim.

Type: Jellyfish

Details: This Venus flytrap anemone of the genus Actinoscyphia was found in the Gulf of Mexico. Related to jellyfish, sea anemones get their name from the flower of the same name.

Type: Eel or fish

Details: The black swallower fish has the ability to swallow prey much larger than itself thanks to the extended gut attached to its belly. This adaptation is especially useful since black swallowers live in the deep and food can be scarce to come by in the abysmal depths of the sea.