Topics: Cnidaria, Encyclopædia Britannica, Encyclopedia Pages: 3 (614 words) Published: October 8, 1999

The Portuguese man-of-war if a member of the Kingdom Animalia, phylum Cnidaria(1), class Hydrozoa, order Siphonophra, the genus Physalia, and the species Physalia(2).
The man-of-war is not an actual jellyfish, but a Siphonophor. Also the man-of-war is not a single organism. It is made up of many different organisms that work together. These organisms are called polyps.

The Portuguese man-of-war is usually found in the Northern Atlantic gulf stream. It can also be found in the tropical and subtropical regions of the Indian and Pacific Oceans.
The man-of-war will usually travel in groups, that may contain up to one thousand members.
The main portion of the man-of-war's body is an oblong gas-filled bladder. The bladder is usually nine to thirty centimeters long, and is a translucent pink, blue, or purple. On top of the bladder is a crest. This is to catch the wind, and move the man-of-war along. Below the bladder, hang long stringy tentacles, that can reach a length of up to fifty meters. The tentacles are made-up of three different types of polyps. The names of these three polyps are: dactylozooid, gonozooid, and gastrozooid. The polyps are the parts that: capture prey, digest prey, and reproduce. The dactylozooids have cells called nematocysts(3). The nematocysts release a toxin(4) into anything that they come into contact with. The gastrozooids then attach to the dead/stunned victim, and spread over it. They digest it, and transfer food to the rest of the man-of-war. Last, the gonozooids create other polyps. The means by which the man-of-war reproduces, however, is not yet understood.

The fish Nomeus gronvii lives among the tentacles of the man-of-war. This fish, which is eight centimeters long, is mostly immune to the man-of-war's toxin. It will eat the tentacles, which will grow back, as its main source of food. Although it is mostly immune to the man-of-war's toxin, the man-of-war will sometimes end up eating it.

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Bibliography: "Portuguese man-of-war," Encyclopedia Britannica. 1988, University of Chicago:
"Portuguese man-of-war," Animal Kingdom. 1972, United States of America: Vol., United
States of America:, 1997
Microsoft Encarta 1996. Silicon Valley Ca., Microsoft Corporation, 1997
1 Cnidaria and Celenorates are two interchangeable names for this Phylum.
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