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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.
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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The two divers shared their encounter with a human-sized barrel jellyfish, Rhizostoma pulmo. The species could typically grow up to one meter (3.2 feet) and weigh up to 25 kilograms (55 lbs). However, they are not larger than the lion's mane jellyfish. [10] Rhizostoma pulmo is moderately venomous but not as deadly as other species. Effects ...
Catostylus mosaicus is also known as the jelly blubber or blue blubber jellyfish. [1] The jelly blubber is distinguishable by its color, which ranges from light blue to a dark blue or purple, and its large (250-300mm [ 2 ] ), rounded bell which pulses in a staccato rhythm. [ 1 ]
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. ... 20 quick and easy ...
The Scyphozoa are an exclusively marine class of the phylum Cnidaria, [2] referred to as the true jellyfish (or "true jellies"). The class name Scyphozoa comes from the Greek word skyphos ( σκύφος ), denoting a kind of drinking cup and alluding to the cup shape of the organism.
Helmet jellyfish feeding on an armhook squid underwater. Helmet jellyfish reach a body size of up to 30 cm (12 in). The average wet weight of the jellyfish is 540 grams. [2] Overall, helmet jellyfish have a uniform size. [3] They consist 90% of water, the rest being tissue and gelatinous mass, which give the animals their form.