Nettles. They were sent in by H. Tiner. This aptly named jellyfish does not have the fringe tentacles that other species do. The mushroom cap jelly actually has mildly stinging nematocysts in place of traditional tentacles. Keep in mind that this is not a list of jellyfish that don’t sting—it’s a list of the types of jellyfish that aren’t dangerous to humans. Even if they do release the toxic mucus, it’s not so toxic. Adults range from the size of a softball to a volleyball. Size & Shape. As long as you do not disturb them too much they will not release the toxin filled mucus. Great photos of a Mushroom Cap Jelly. Posts about mushroom cap jellyfish written by stingmate. Mushroom Cap Jellyfish. The mushroom cap jellyfish is an uncommon visitor into lower Chesapeake Bay during the fall and early winter. The upside down jellyfish’s stinging cells are produced in a mucus that is released into the water when disturbed from the bottom. Lion’s mane jellyfish are distinctive for their red-tinted bell. While not all jellyfish sting; many are harmless to humans, but it is always best to avoid touching them. The sting is very mild and most people don’t even feel it. This jelly has no tentacles, but does have some appendages under the bell with brownish pigmentation. The most frequent culprit behind jellyfish stings on the OBX is the nettle. Sting. In the first two photos, the jelly is upside-down. Like the mushroom cap jelly, the cannonball jelly lacks tentacles around the outside of the swimming bell. In Rehoboth, Buckson said the jellyfish that caused the most trouble is the mushroom cap jellyfish, which looks similar to the lion’s mane with its large, bright-colored bell, although mushroom cap jellies have shorter tentacles. True Jellies without painful sting (have stinging cells to catch prey, just do not hurt when humans brush against them): Late summer/early fall: cannonball/cabbagehead jellies; Summer: moon jellies; Late fall/winter: mushroom cap jellies; Other jelly-like creatures, none of these cause a painful sting: Crown jellyfishes are the eight families of jellyfish that belong to the order Coronatae. It’s best to stay out of any area where a single jellyfish has been spotted. Dead and sand-covered jellies can still sting, so watch for those on the beach as well. Dua Lipa is adding a new feather to her cap. Jellyfish tentacles can be very long, so avoiding the mushroom cap of doom is not enough. The sting is mild if felt at all. Mushroom jellies tend to make appearances in the late fall into the winter. 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