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Spotted jellies swimming in a Tokyo aquarium. Jellyfish, also known as sea jellies, are the medusa -phase of certain gelatinous members of the subphylum Medusozoa, which is a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are anchored to the ...
Lion's mane jellyfish. The lion's mane jellyfish ( Cyanea capillata ), also known as the giant jellyfish, arctic red jellyfish, or the hair jelly, [2] is one of the largest known species of jellyfish. Its range is confined to cold, boreal waters of the Arctic, northern Atlantic, and northern Pacific Oceans.
Turritopsis dohrnii, also known as the immortal jellyfish, is a species of small, biologically immortal jellyfish [2] [3] found worldwide in temperate to tropic waters. It is one of the few known cases of animals capable of reverting completely to a sexually immature, colonial stage after having reached sexual maturity as a solitary individual.
The Irukandji jellyfish ( / ɪrəˈkændʒi / irr-ə-KAN-jee) are any of several similar, extremely venomous species of rare jellyfish. With a very small adult size of about a cubic centimetre (1 cm 3 or 0.061 in 3 ), they are both the smallest and one of the most venomous jellyfish in the world. They inhabit the northern marine waters of ...
Aequorea victoria, also sometimes called the crystal jelly, is a bioluminescent hydrozoan jellyfish, or hydromedusa, that is found off the west coast of North America. The species is best known as the source of aequorin (a photoprotein ), and green fluorescent protein (GFP); two proteins involved in bioluminescence.
The oldest examples of swimming jellyfish, which lived in Earth’s oceans 505 million years ago, have been discovered high within the Canadian Rockies. Researchers found 182 fossils encased ...
Fossilized stranded scyphozoans on a Cambrian tidal flat at Blackberry Hill, Wisconsin. 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 ...
Stygiomedusa stauchi. Stygiomedusa gigantea, commonly known as the giant phantom jelly, is the only species in the monotypic genus of deep sea jellyfish, Stygiomedusa. It is in the Ulmaridae family. [2] With only around 110 sightings in 110 years, it is a jellyfish that is rarely seen, but believed to be widespread throughout the world, with ...