Jellyfish

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Introduction1

Our Favorite Jellyfish Facts (National Aquarium)

Dictionary

jellyfish : the typically free-swimming, bell-shaped, usually sexually-reproducing solitary or colonial form of a cnidarian in which the whorls of tentacles lined with nematocysts arise and hang down from the margin of the nearly transparent, gelatinous bell — Webster

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Encyclopedia

Jellyfish or sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, 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 not mobile, being anchored to the seabed by stalks. The bell can pulsate to provide propulsion and 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, the planula larva can disperse widely and is followed by a sedentary polyp phase.

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, mature within a few months and 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.

Jellyfish are 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 also injure humans. Many thousands of swimmers are stung every year, with effects ranging from mild discomfort to serious injury or even death; small box jellyfish are responsible for many of these deaths. When conditions are favourable, jellyfish can form vast swarms. These 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. — Wikipedia

Encyclopædia Britannica

Search

WolframAlpha

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Inspiration

Note: These are 360° videos — press and hold to explore it!

Jellies Invasion (National Aquarium) (Live cam)

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Innovation

Science

The Immortal Jellyfish (American Museum of Natural History)

Technology

How Jellyfish Work (Stephanie Watson (How Stuff Works)

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Preservation

Museum

World’s largest jellyfish collection (Euronews)
Kamo Suizoku-kan (Official Site)

Jellyfish Museum, Kiev, Ukraine (Trip Adviser)
Jellyfish Museum, Kiev, Ukraine (Official Site)

Library

WorldCat, Library of Congress, UPenn Online Books, Open Library

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Participation

Education

Jellyfish (Biology4Kids)

OER Commons: Open Educational Resources

News

Phys.org, NPR Archives

Book

ISBNdb

Government

Document

USA.gov

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Expression

Fun

Adventure

Palau’s Jellyfish Lake reopens as thousands of jellyfish return (Maggie Hiufu Wong, CNN)
Ongeim’l Tketau Jellyfish Lake – Open to Visitors (Palau Gov)
Jellyfish Lake, Eil Malk island, Palau (Wikipedia)

Poem

OEDILF: The Omnificent English Dictionary In Limerick Form

Music

Song Lyrics

Fiction

Fictional jellyfish (Wikipedia)

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More News …

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Related

Here are links to pages about closely related subjects.

Knowledge Realm

Terrestrial

Sphere Land, Ice, Water (Ocean), Air
Ecosystem Forest, Grassland, Desert, Arctic, Aquatic

Life Cell, Gene, Tree of Life
Microorganism
Plant Flower, Tree
Animal
Invertebrate Cuttlefish, Octopus, Ant, Bee, Butterfly, Spider, Lobster
Vertebrate Fish, Seahorse, Ray, Shark, Frog, Turtle, Tortoise, Dinosaur
Bird, Ostrich, Owl, Crow, Parrot
Mammal Bat, Rabbit, Giraffe, Camel, Horse, Elephant, Mammoth
Whale, Dolphin, Walrus, Seal, Polar Bear, Bear, Cat, Tiger, Lion, Dog, Wolf
Monkey, Chimpanzee, Human

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Notes

1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.