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Rhopilema verrilli, the mushroom cap jellyfish, is a species of jellyfish in the family Rhizostomatidae. They are cnidarian invertebrates distinguished by their mushroom-shaped medusae. The species does not have any tentacles; however, they still have stinging cells, called nematocysts , within their bells, which can produce mild stings to humans.
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Upon reaching adult size, jellyfish spawn regularly if there is a sufficient supply of food. In most species, spawning is controlled by light, with all individuals spawning at about the same time of day; in many instances this is at dawn or dusk. [66] Jellyfish are usually either male or female (with occasional hermaphrodites).
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Over 100 cannonball jellyfish dot the shoreline on Hilton Head Island on April 19, 2021. The jellyfish, which don’t sting, wash up each year in spring and early summer.
Each free-swimming ephyra (singular) develops into an adult medusa, which has come to possess a rhopalial nervous system that it did not previously possess. [ 1 ] When the process of strobilation is at its genesis, before rhopalia begin their formation, small swellings manifest at the bases of specific tentacles in the polyp; these will become ...
Scyphozoa is the group commonly known as "true jellyfish" and occur in tropical, temperate and polar seas worldwide. Scyphozoans generally have planula larvae that develop into sessile polyps. These reproduce asexually, producing similar polyps by budding, and then either transform into medusae, or repeatedly bud medusae from their upper ...