Jellyfish

1 year ago
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Jellyfish and sea jellies are the common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa which is a major part of the phylum Cnidaria. Jellyfish Pacific sea nettle ("Chrysaora fuscescens") Pacific sea nettle (Chrysaora fuscescens) Scientific classificationEdit this classification Domain: Eukaryota Kingdom: Animalia Phylum: Cnidaria Subphylum: Medusozoa Groups included Acraspeda Cubozoa—box jellyfish Scyphozoa—true jellyfish Staurozoa—stalked jellyfish some Hydrozoa—small jellyfish Cladistically included but traditionally excluded taxa some Hydrozoa such as Hydra Spotted jellies swimming in a Tokyo aquarium Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles although a few are anchored to the seabed by stalks rather than being mobile. The bell can pulsate to provide propulsion for highly efficient locomotion. The tentacles are armed with stinging cells and may be used to capture prey and defend against predators. Jellyfish have a complex life cycle. The medusa is normally the sexual phase which produces planula larvae; these then disperse widely and enter a sedentary polyp phase before reaching sexual maturity. Jellyfish are found all over the world from surface waters to the deep sea. Scyphozoans (the "true jellyfish") are exclusively marine but some hydrozoans with a similar appearance live in freshwater. Large often colorful jellyfish are common in coastal zones worldwide. The medusae of most species are fast-growing and mature within a few months then die soon after breeding

Jellyfish and sea jellies #shorts
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Jellyfish
Pacific sea nettle ("Chrysaora fuscescens")
Pacific sea nettle (Chrysaora fuscescens)
Scientific classificationEdit this classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Cnidaria
Subphylum:
Medusozoa
Groups included
Acraspeda
Cubozoa—box jellyfish
Scyphozoa—true jellyfish
Staurozoa—stalked jellyfish
some Hydrozoa—small jellyfish
Cladistically included but traditionally excluded taxa
some Hydrozoa, such as Hydra

Spotted jellies swimming in a Tokyo aquarium
Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are anchored to the seabed by stalks rather than being mobile. The bell can pulsate to provide propulsion for highly efficient locomotion. The tentacles are armed with stinging cells and may be used to capture prey and defend against predators. Jellyfish have a complex life cycle. The medusa is normally the sexual phase, which produces planula larvae; these then disperse widely and enter a sedentary polyp phase, before reaching sexual maturity.

Jellyfish are found all over the world, from surface waters to the deep sea. Scyphozoans (the "true jellyfish") are exclusively marine, but some hydrozoans with a similar appearance live in freshwater. Large, often colorful, jellyfish are common in coastal zones worldwide. The medusae of most species are fast-growing, and mature within a few months then die soon after breeding, but the polyp stage, attached to the seabed, may be much more long-lived. Jellyfish have been in existence for at least 500 million years,[1] and possibly 700 million years or more, making them the oldest multi-organ animal group.[2]

Jellyfish are eaten by humans in certain cultures. They are considered a delicacy in some Asian countries, where species in the Rhizostomae order are pressed and salted to remove excess water. Australian researchers have described them as a "perfect food": sustainable and protein-rich but relatively low in food energy.[3]

They are also used in research, where the green fluorescent protein used by some species to cause bioluminescence has been adapted as a fluorescent marker for genes inserted into other cells or organisms.

The stinging cells used by jellyfish to subdue their prey can injure humans. Thousands of swimmers worldwide are stung every year, with effects ranging from mild discomfort to serious injury or even death. When conditions are favourable, jellyfish can form vast swarms, which can be responsible for damage to fishing gear by filling fishing nets, and sometimes clog the cooling systems of power and desalination plants which draw their water from the sea.

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