These jellyfish are tiny and are extremely toxic if they sting. This is a dangerous species that you should aim to avoid. 27) Sea Wasp. Cannonball jellyfish (Stomolophus meleagris) About the size and shape of a cannon ball this jellyfish is also known as the cabbagehead jellyfish. The stings are harmless to humans. Jellyfish, The most dangerous marine organism on the planet. jellyfish. Clinging jellyfish made their way to the East Coast more than 100 years ago. These are the most dangerous type of jellyfish known. Cauliflower Jellyfish. On the surface, these gelatinous animals are very frustrated. Barrel jellyfish, the size of dustbin lids, have been spotted in large numbers on the Cornish coast. They are found throughout the temperate waters of the North Pacific and along the US Eastern seaboard right down to Brazil. Cauliflower jellyfish. It can grow up to 2 feet in diameter and is known for its full skirt of squishy appendages. “Bowel movements change from person to person depending on his or her diet, physical activity, how much water they consume and what medications they take,” said M. Nuri Kalkay, a retired gastroenterologist and health blogger. Mostly found in the coastal waters of Northern Australia and New Guinea, this species has venomous tentacles up to 3 meters (9.8 ft) long. Cannonball Jellyfish – not so dangerous. Cauliflower jellyfish (Photo: Levent Konuk/Shutterstock) Cephea cephea, also known as the cauliflower jellyfish or crowned jellyfish, is a resident of the Red Sea. This jellyfish does not have tentacles; instead eight thick, frilled arms that look a bit like cauliflower florets hanging underneath. 26) Irukandji Jellyfish. They are able to grow up to 2 meters wide and have tentacles divided into eight clusters, and … The deadliest jellyfish in the whole world are the box jellyfish and they are also known as the cube-shaped medusa.Big box jellyfish can be found in several species such as chironex quadrigatus in Japan, chironex fleckeri in Australia and other species that led to many deaths. The term jellyfish is a vernacular name for the free forms of many cnidarians and, therefore, opposed to polyps, sessile forms. Sea wasp is a species of Box jellyfish, it is the most lethal jellyfish in the world. Most of the Jellyfish’s stings do not harm you at all, while some of them cause terrible pain for you. ... smooth or fringed in cauliflower) collecting plankton or nekton. They were first reported in Woods Hole, Massachusetts, in 1894, according to Bilinski. The worst part is their inhabitant the regions with waters with a slightly warm temperature like the coastal regions. 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