There are more to these fascinating undersea dwellers than you probably realize. They have one orifice that does the job of both the mouth and the anus. The box-shaped medusa (stomach) of these jellyfish is their unique characteristic. Fun Jellyfish Facts For Kids: A group of jellyfish is called smack or bloom. They are plankton from the … Fun facts about jellyfish - did you know they aren’t even fish at all? A group of fish is called a school. • A jellyfish’s solid body mass is only 5 percent; it’s 95 percent water! Some jellyfish can grow as large as a human being, while others are as tiny as the head of a pin. By Lanessa Cago on December 1 2017 in Environment. Jellyfish live in the sea and are found in all oceans. With rounding errors we have found that jellyfish are 85% Oxygen, 9.5% Hydrogen, 3% Carbon, 1.5% Nitrogen, 0.2 Calcium, 0.15% Phosphorus, 0.06 Sulfur. The Aquarium in the Rotterdam Blijdorp Zoo contains a beautiful spherical tank with a group of moon jellyfish. Read on further to know some more interesting facts and amazing information on box jellyfish. 1. Fun Facts About Fried Egg Jellyfish 1. The lion’s mane jellyfish is one of the largest jelly species in the world, growing to an average length of 1.5 feet (40 cm), but can reach lengths of 6.5 feet (200 cm). Jellyfish are ubiquitous in the seas and oceans. Many refer to groups of jellyfish as blooms or swarms, but they can also be called a "smack.". Jellyfish, along with the sea whip, coral and sea anemone, belong to phylum Cnidaria. Jellyfish are not fish and they are related to corals and anemones. Jellyfish have organs which produce bio-luminescent protein and enable them to glow in the dark. Jellyfish do not have brains, and they're not even fish! Jellyfish are ‘jelly-like’ creatures that live in the ocean. They do not have a central nervous system,a circulatory system, respiratory system, or a osmoregulatory system. They are a very old breed of dog and incredibly intelligent to boot. Dive into more fun jellyfish facts here to learn surprising statistics, amazing trivia, & history. 8 Fantastic Facts About the Portuguese Man-of-War, Scientists Discover Eerie New Jellyfish in the Deepest Part of the Oceans (Video), 'Psychedelic' Jellyfish Dominates the Deep-Sea Dance Floor, Fish Food: 13 Marine Animals Named by Hungry Biologists, Exploring the Secrets of Jellyfish Survival, Strange Jelly Creatures Are Washing Up on East Coast Beaches, Edith Widder on Mimicking the Glow of Deep Sea Fish to Discover New Species, This Little Animal Can Potentially Live Forever, 16 Ocean Creatures That Live in Total Darkness, Three Quarters of Deep-Sea Creatures Glow in the Dark. They are highly venomous invertebrates and are notorious for their deadly venom. Jellyfish aren't fish at all. The fossils of jellyfish are difficult to be found because they don’t have skeletons. To make matters worse, their stings are excruciatingly painful — it's said the pain could kill you before the venom does. Jellyfish, also known as jellies, are fascinating animals that spend their lives floating in the oceans. These fun facts about jellyfish are all you need to know about jellyfish and their crazy history on Earth. Although it is virtually impossible to distinguish the many different subspecies of this organism without extensively studying their DNA, they are all characterized by the appearance of four reproductive organs, or 'gonads', which are each shaped like a horseshoe, and which ca… A group, or "smack," of Moon Jellyfish. Jellyfish are one of the oldest animals on Earth and have changed very little from their prehistoric ancestors. They have no brains. The blue lighting makes them look even more magical. However, it's not actually a jellyfish.Like true jellyfish, it belongs to the phylum Cnidaria, but a box jellyfish has a cube-shaped bell, four sets of tentacles, and a more advanced nervous system. … For instance, the box jellyfish has 24 "eyes," two of which are capable of seeing in color. You might be surprised by what you don't know about these oddly charismatic gelatinous creatures. They also don't have a heart; their gelatinous bodies are so thin they can be oxygenated solely by diffusion. Among the most extraordinary animals on earth, jellyfish (Cnidarians, scyphozoans, cubozoans, and hydrozoans) are also some of the most ancient, with an evolutionary history stretching back for hundreds of millions of years. In fact, these animals are actually invertebrates and they are more closely related to … Jellyfish are made up mostly of water. They Are 98% Water, Without a Brain or a Heart. 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