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Marine invertebrates


CITE
We have made every effort to follow citation style rules, but there may be some minor differences. If in doubt, please refer to the appropriate citation style manual.
Jellyfish. (2013). In Q-files Encyclopedia, Life, Marine invertebrates. Retrieved from
https://www.q-files.com/life/marine-invertebrates/jellyfish
"Jellyfish." Life, Marine invertebrates, Q-files Encyclopedia, 9 Oct. 2013.
https://www.q-files.com/life/marine-invertebrates/jellyfish.
Accessed 11 Dec. 2019.
Jellyfish 2013. Life, Marine invertebrates. Retrieved 11 December 2019, from
https://www.q-files.com/life/marine-invertebrates/jellyfish
Life, Marine invertebrates, s.v. "Jellyfish," accessed December 11, 2019.
https://www.q-files.com/life/marine-invertebrates/jellyfish

Jellyfish
Pacific sea nettle
Jellyfish are marine invertebrates with bell-shaped bodies and stinging tentacles. Because jellyfish are not fish, scientists refer to them as scyphozoans, the "true jellyfish". They are more than 90% water and have no heart, bones or brain. Some swim by jet propulsion, but most are carried by the ocean tides and currents. Jellyfish belong to the cnidarian phylum of invertebrates, which also includes sea anemones, sea pens and coral polyps.
Stinging tentacles
Jellyfish float with their tentacles hanging down in the water. Each tentacle is armed with stinging cells, used to paralyse or kill prey. Jellyfish feed on small fish and other marine creatures that become caught in their tentacles. The most venomous creature on Earth is the box jellyfish. Just a touch of its powerful stinging tentacles can kill a person in four minutes.Lion's mane jellyfish
Lion's mane jellyfish


Some jellyfish, such as the box jellyfish, have a sting powerful enough to kill a human within a few minutes of contact.

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