10 Different Types of Jellyfish. Some beaches in the northeastern United States are dealing with more than the threat of COVID-19 this holiday weekend. The former is a small stalk that attaches to a rock and divides into buds which break free to become adults. “This is the largest jellyfish in the world,” said Miller. It is not an area of expertise for me. This rare creature has only been sighted 114 times in the last 110 years and is believed to be one of the largest invertebrate predators in … The lion’s mane is a stinging jellyfish.” The ones at Connecticut beaches are considered babies, but can grow to be huge. Here is a mini-guide to the main jellyfish species and the most recognizable gelatinous plankton species prevalent in our seas. Scientists in Woods Hole studied the species … Many people think of jellyfish as some of the smallest animals found in the ocean, but they really do come in all different sizes.Currently, around 2000 jellyfish types have been documented, but scientists estimate that there could still be over 300,000 species yet to be discovered.That’s a lot of jellies… Ecology: Craspedacusta sowerbyi occupies a range of freshwater habitats. Mark Conlin / Oxford Scientific / Getty Images. The most popular species being Moon jellyfish. After I came home and did a few minutes of research, I was relatively sure it was cyanea capillata, or Lion’s Mane Jellyfish. The clinging jellyfish were first recorded along the U.S. East Coast in the Cape Cod and the Groton, Connecticut areas in 1894. Moon jellyfish have two main stages to their lifecycle: polyp and medusa. But not all jellyfish are stinging; many are harmless to humans, but it is always best to avoid touching them. Commonly found in and associated with rivers and fjords. The moon jelly or common jellyfish is a beautiful translucent species that has phosphorescent colors and graceful, slow movements.. Is it a Jellyfish? Cyanea is a genus of jellyfish, primarily found in northern waters of the Atlantic and Pacific Oceans and southern Pacific waters of Australia and New Zealand, there are also several boreal, polar, tropical and sub-tropical species. There are at least 18 species in this family. It was clearly a jellyfish, though I was not positive on the species. The family also has rare species like Stygiomedusa gigantea. Click on the illustrations of each individual jellyfish to learn more about the respective species. 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