It has a bell measuring around 70 cm in diameter. Irukandji Jellyfish is extremely tiny and extremely venomous species of jellyfish. This species of jellyfish has an ability to glow in the dark. They have a significant difference in their lifespan ranging from few days to several years. Jellyfish do not have nervous system or brain. The size of the bell averages 3 feet, and that of oral arms is 20 feet. Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria. There is the Hydrozoa (more than 1000 species), Cubozoa ( more than 20 species), Stauroza (more than 50 species), and Scyphozoa (more than 200 species). There are more than 1,500 different Jellyfish species that have been identified. This species was a part of Ulmaridae family but is now the only member of Phacellophoridae family. While there are more than 200 species of jellyfish, just six of them are routinely found in UK waters - but all of them can sting. Found in the freezing waters of the Arctic ocean and the Northern Pacific Ocean, they are known to survive in the coldest weather conditions. Not all jellyfish are harmless. The pink color is normally visible in its young age. The box jellyfish measures 10 feet (3 meter) in length, and 10 inches (25 cm) across. They can be found in all the seas and oceans of the world at every level of the water, from the surface to the very depths. Jellyfish have a simple digestive cavity with four to eight oral arms near the mouth. They are both beautiful—the jellyfish with their pulsating bells and long, trailing tentacles, and the comb jellies with their paddling combs generating rainbow-like colors. Originally from the Caribbean, this 5 millimeter long creature has steady population across the world, attracting the curiosity of experts all over. When floating, cannonball jellies take on a spherical shape with multiple, stubby oral arms peaking from underneath the red-fringed bell. Their lifespan can vary from as little as a few days to about a year. It is mandatory to procure user consent prior to running these cookies on your website. Each of these families contain different types of jellyfish of various genus, and these genus contain different species of jellyfish. There are 3 known species in this family. Box Jellyfish Their stings are slightly painful, but is limited to only a small period of time and does not cause much harm. It is also called sea blubber and is found in northern Atlantic, cold boreal water, and northern Pacific Oceans. The tentacles are armed with stinging cellsand may be used to capture prey and de… This is the most common species in the world and can be identified by the four horseshoe-shaped gonads that can be seen through the top of the bell. Find out what diver Victor Vescovo came across in the Java Trench and how he got there. Jellyfish (Also called jellies or sea jellies) is basically a salt water fish that is found in seas and oceans. But not all jellyfish are stinging; many are harmless to humans, but it is always best to avoid touching them. Flower hat jellyfish hardly survives more than 6 months. The body size varies from 6-8 inches and tentacles may grow up to 6 feet long, they are smaller than the Pacific sea nettle species. Its size ranges between 8-10 inches. This type of jellyfish can be easily identified as they have white bells at the bottom that are surrounded by a ring of purple or brown pigment. A new type of jellyfish may have been discovered in the deepest depths of the Indian Ocean. Black Aquatic Jellyfish: This is another type of jellyfish that appear into each ocean and freshwater. 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