Jellyfish Wallpapers

Jellyfish are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a significant 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 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 usually the later phase, producing planula larva that disperses widely and enters a sedentary polyp phase before reaching 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 and possibly 700 million years or more, making them the oldest multi-organ animal group.

Humans eat jellyfish 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.

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