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Man of War

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Portuguese man of war Anyone unfamiliar with the biology of the venomous Portuguese man-of-war would likely mistake it for a jellyfish. Not only is it not a jellyfish, it's not even an
"it," but a "they." The Portuguese man-of-war is a siphonophore, an animal made up of a colony of organisms working together.The man-of-war comprises four separate polyps. It gets its name from the uppermost polyp, a gas-filled bladder, or pneumatophore, which sits above the water and somewhat resembles an old warship at full sail. Man-of-wars are also known as bluebottles for the purple-blue color of their pneumatophores. Most people can be attracted by its purple-blue color, its like the color of the clean ocean, however, never being interested in touching them. Its venomous tentacles can deliver a painful sting. The gelatinous consistench and open-ocean lifestyle of pertuguese man of war make it especially difficult to study the creatures. And man-of-wars don’t do well in captivity. Researchers can only keep them for a limited time but haven’t yet been able to raise them throughout their entire life cycle in lab. The portuguese man of war is mainly distributed in the warm waters, Although it can be found anywhere in the open ocean it is most commonly found in the tropical and subtropical regions of the Pacific, Indian and Atlantic oceans. The Portuguese man o' war has been found as far north as the Bay of Fundy and the Hebrides. It is moved by a combination of winds, currents, and tides. Also some strong winds may drive them into bays or onto beaches.The body consists of a gas-filled, bladderlike float, which may be 9 to 30 cm long and may extend 15 cm (6 inches) above the water. It is a translucent structure tinted pink, blue, or violet. Beneath the float are clusters of polyps, from which hang tentacles of up to 50 metres (about 165 feet) in length. The polyps are of three types: dactylozooid, gonozooid, and gastrozooid, concerned, respectively, with capturing prey, with reproducing, and with feeding.
The animal moves by means of its crest, which functions as a sail. The reproductive habits of Physalia are not fully understood. Capuchin jellyfish are a class of planktoniccoelenterate animal life gregarious, their social division of labor is fairly clear, and the effect is remarkable. The tentacles, or dactylozooids, are the Man-of-War's mainmechanisms for catching its prey and are also used for defense, sometimes traps and consumes larger fishes such as flying fish and mackerel, though fishes as large as these generally manage to escape from the tentacles. The food of the Man-of-War is digested in its bag-like stomachs
, which are located along the underside of the float. The gastrozooids digest the prey by secreting enzymes that break down proteins, carbohydrates and fats. Each
Man-of-War has multiplegastrozooids complete with individual mouths. After the food has been digested, any undigestible remains are pushed out through the mouths.
The nourishment from the digested food is absorbed into the body and eventually circulates to the different polyps in the colony. The portuguese man of war is considered as “ the killer of swimmers” , in 2000 the
Swimmers who were stinged by the portuguese man of war, 68% of them died from that. Another 32% of the lucky survivors also have a part of their body disabled. Only a few people can get away from the tentacles of portuguese man of war. The toxin of belongs to the neurotoxin, with the time going on, the toxin gradually increased in human body. A sting may lead to an allergic reaction. It can alos lead to fever, the increasing of blood pressure…

References: www.wikipedia.com www.animalnatinalgeographic.com www.news.nationalgeographic.com www.baidu.com www.baike.com www.eol.org
www.sciencedirect.com

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