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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.
The lion's mane jellyfish, Cyanea capillata, was long-cited as the largest jellyfish, and arguably the longest animal in the world, with fine, thread-like tentacles that may extend up to 36.5 m (119 ft 9 in) long (though most are nowhere near that large). [54] [55] They have a moderately painful, but rarely fatal, sting. [56]
Like other jellyfish, lion's manes are capable of both sexual reproduction in the medusa stage and asexual reproduction in the polyp stage. [15] Lion's mane jellyfish have four different stages in their year-long lifespan: a larval stage, a polyp stage, an ephyrae stage, and the medusa stage. [15]
There's evidence to suggest that the comb jellyfish was the first animal to appear on Earth some 700 million years ago. ‘Time-traveler’ jellyfish found to age backward in accidental discovery ...
The identification of sexually mature specimens, in both winter and summer, and at sites nearly 90 km apart, suggests a local population has been established. [ 1 ] [ 2 ] Reports of a new and previously unknown type of jellyfish near the southern Lebanese port of Sidon have also appeared in the Lebanese press, though these have yet to be ...
Malo kingi or the common kingslayer is a species of Irukandji jellyfish.It was first described to science in 2007, and is one of four species in the genus Malo. [1] It has one of the world's most potent venoms, even though it is no bigger than a human thumbnail. [2]
This is an accepted version of this page This is the latest accepted revision, reviewed on 3 February 2025. Species of small, biologically immortal jellyfish Immortal jellyfish Turritopsis dohrnii medusa Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Cnidaria Class: Hydrozoa Order: Anthoathecata Family: Oceaniidae Genus: Turritopsis Species: T. dohrnii Binomial name ...
The medusa of the white cross jellyfish is clear ranging from 3 to 5 cm (1.2 to 2.0 in) thick and 10 to 20 cm (3.9 to 7.9 in) wide. [1] Visually it is very similar to Mitrocoma cellularia, but they tend to only grow up to 10 cm (3.9 in) in diameter. [2]