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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   See also   OneLook


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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. — Wikipedia

Jellyfish (Encyclopædia Britannica)

Medusozoa is a clade in the phylum Cnidaria, and is often considered a subphylum. It includes the classes Hydrozoa, Scyphozoa, Staurozoa and Cubozoa, and possibly the parasitic Polypodiozoa. Medusozoans are distinguished by having a medusa stage in their often complex life cycle, a medusa typically being an umbrella-shaped body with stinging tentacles around the edge. With the exception of some Hydrozoa (and Polypodiozoa), all are called jellyfish in their free-swimming medusa phase. — Wikipedia

Medusozoa (Encyclopædia Britannica)

Jellyfish (One Zoom)
Medusozoa (WolframAlpha)




Cnidariology is the subdiscipline of Zoology that consists of the study of Cnidaria. — Wikipedia




DDC: 593.8 Jellyfish (Library Thing)
Subject: Jellyfish (Library Thing)

Subject: Jellyfish (Open Library)

LCC: QL 380 Jellyfish (UPenn Online Books)
Subject: Jellyfish (UPenn Online Books)

LCC: QL 380 Jellyfish (Library of Congress)
Subject: Jellyfish (Library of Congress)

Subject: Jellyfish (WorldCat)




Jellyfish (Biology4Kids)

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Zoologists and Wildlife Biologists (CareerOneStop, U.S. Department of Labor, Employment and Training Administration)
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Zoological Association of America
Association of Zoos and Aquariums


Jellyfish (EurekaAlert, American Association for the Advancement of Science)
Jellyfish (bioRxiv: Preprint Server for Biology, Cold Spring Harbor Laboratory)
Jellyfish (Science Daily)
Jellyfish (Science News)
Jellyfish (
Jellyfish (NPR Archives)



Jellyfish (


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Microorganism Virus
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Primate Monkey, Chimpanzee, Human



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