Medusa Jellyfish (Craspedacusta sowerbyi)

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First on the list is the unique-looking freshwater jellyfish called ‘Medusa’. This kind of jellyfish has a muscular, shelf-like structure called velum on the ventral surface attached to the bell margin. This species of ‘medusa’ (other name for jellyfish) can be found throughout the world.

Upside Down Jellyfish (Cassiopea Jellyfish)

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The Upside Down Jellyfish which resembles a sea anemone is commonly found in shallow mangrove swamps, mudflats, and turtle grass flats and various other similar environments around the world. It thrives usually upside-down on the bottom. It’s called ‘upside down jellyfish’ because it lies on its back with its bell touching the ground. It has a mild sting that appears in the form of a red rash-like skin irritation and is notorious for being extraordinarily itchy.

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In some occasion, the Upside Down Jellyfish is picked up by a Dorippe frascone (crab) and carry it on its back to defend itself against possible predators. Colors of Upside Down Jellyfish may vary from shades of white, blue, green and brown.

Blue Jellyfish (Cyanea lamarckii)

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A Blue Jellyfish is a species of jellyfish that can be found in the western Pacific around Japan, off the west coast of Scotland and in the North Sea. This lovely-looking species has a blue or yellow tone and grows up to 30 cm. It is also known as the Bluefire Jellyfish.

Crown Jellyfish (Coronatae)

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One of the loveliest-looking species of jellyfish is the Crown Jellyfish. This species belong to the eight families of jellyfish that belong to the order Coronatae.

Crystal Jelly (Aequorea victoria)

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The Crystal Jelly, another unique jellyfish, is a bioluminescent hydrozoan that is found off the west coast of North America. This species is capable of producing flashes of blue light by a quick release of calcium which interacts with the photoprotein aequorin. The blue light produced is in turn transduced to green by the now famous green fluorescent protein (GFP).

Japanese Sea Nettle (Chrysaora melanaster)

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The Japanese Sea Nettle is a species of jellyfish that is endemic to the eastern Pacific Ocean. This species is also commonly called Northern Sea Nettle and Brown Jellyfish.

Black Sea Nettle (Chrysaora achlyos)

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The Black Sea Nettle is a species of giant jellyfish that can be found in the waters of the Pacific Ocean. The bell of this jellyfish can reach up to 1 meter in size and its oral arms can extends up to 6 meters in length. It is by far the largest invertebrate discovered in the 20th century. It is also sometimes referred to as the Black Jellyfish because of its dark coloration.

Moon Jelly (Aurelia aurita)

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Moon Jelly is a translucent and is recognizable by the 4 horseshoe-shaped on top of its bell. Like other jellies it primarily drifts with the current even when it is swimming. Other common names of this species include Moon Jellyfish, Common Jellyfish and Saucer Jelly.

Nomurai’s Jellyfish (Nemopilema nomurai)

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Nomurai’s Jellyfish, like the Lion’s Mane jellyfish, it is a very large jellyfish. This species primarily lives in the water between China and Japan. The diameter of one fully-grown Nomurai’s Jellyfish is slightly greater than the height of an average fully grown man. This species can grow up to 2 meters in diameter and can weigh up to 300 kilograms.

Malo kingi

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Malo kingi is an Irukandji jellyfish, a tiny but extremely venomous species of jellyfish. It is native to Australia and its sting can kill a human.

Flat Jellyfish (Aequorea tenuis)

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The Flat Jellyfish glow in the dark. This small species of hydrozoan jellyfish can be found off the coastline of mainland North America. It can reach 2 inches in diameter with more than eighty fine tentacles.

Indo-Pacific Nomadic Jellyfish (Rhopilema nomadica)

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This large species of jellyfish is commonly called Indo-Pacific Nomadic Jellyfish. This unusual jellyfish can reach a weight of up to 10 kilograms and can sting severely.

Blue Blubber Jellyfish (Catostylus mosaicus)

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This lovely-looking species of jellyfish is commonly known as Blue Blubber Jelly. This picture was taken at the New England Aquarium. This jellyfish belongs to the order of Rhizostomae or Rhizostomeae.

A Blue Blubber Jelly has no tentacle or any other structures on its bell’s edges. Instead, it has eight highly-branched oral arms, along which there are suctorial minimouth orifices.

Box Jellyfish (Chironex fleckeri)

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The Box Jellyfish which is endemic to Australia is considered as the most dangerous jellyfish. It is the most dangerous among venomous species and one of the most dangerous animals in the world. This highly venomous jellyfish’s sting causes excruciating pain and is strong enough to kill 60 adult humans in as little as 3 minutes. Chironex fleckeri is also commonly called Marine Stinger and Sea Wasp.

Nausithoe aurea

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Nausithoe aurea is a species of jellyfish with the most unique appearance. Its tentacles are located above its bell (body) instead of below. Its bell has a structure similar to a flower.

Lion’s Mane Jellyfish (Cyanea capillata)

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The Lion’s Mane Jellyfish is the largest known species of jellyfish. The largest recorded specimen had a bell of 2.3 meters. It is also commonly considered to be the longest animal in the world with a recorded 36.5 meter length of tentacles.

The Lion’s Mane Jellyfish range is confined to cold, boreal waters of the Arctic, northern Atlantic and northern Pacific Oceans.

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See also

World’s Most Colorful and Unique Jellies

Fascinating and Unique Waterworld Creatures

25 Amazing and Bizarre Deep Sea Creatures

25 Important, Unique and Colorful Corals in the World

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12 Intriguing and Unique Marine Animals

Chitons: Colorful and Unique Sea Creatures

The Most Captivating and Stunning Sea Anemones

Exotic Beauties: Extremely Unique Aquatic Pets

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The World’s Most Colorful Crabs

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World’s Most Colorful and Unique Squids

World’s Most Brightly Colored Fishes