<P> The Atlantic Portuguese man o' war (Physalia physalis), also known as the man - of - war, blue bottle, or floating terror, is a marine hydrozoan of the family Physaliidae found in the Atlantic Ocean, as well as the Indian and Pacific Oceans . Its venomous tentacles can deliver a painful sting, which can be fatal . Despite its outward appearance, the Portuguese man o' war is not a jellyfish but a siphonophore, which, unlike jellyfish, is not actually a single multicellular organism, but a colonial organism made up of specialized individual animals (of the same species) called zooids or polyps . These polyps are attached to one another and physiologically integrated to the extent that they are unable to survive independently, and therefore have to work together and function like an individual animal . </P> <P> The Indo - Pacific Portuguese man - of - war (P. utriculus), or blue bottle, is a related species with very similar appearance found throughout the Indian and Pacific Oceans . </P> <P> The name "man o' war" comes from the man - of - war, an 18th - century armed sailing ship, and the cnidarian's supposed resemblance to the Portuguese version at full sail . In other languages, it is known as the' Portuguese war - ship' (Dutch: Portugees oorlogsschip, Norwegian: portugisisk krigsskip, Finnish: portugalinsotalaiva, Chinese: 葡萄牙 戰艦; pinyin: Pútáoyá zhànjiàn), the' Portuguese galley' (German: portugiesische Galeere, Hungarian: portugál gálya), the' Portuguese caravel' (Portuguese: caravela portuguesa, Spanish: carabela portuguesa, Italian: caravella portoghese), (French: caravelle portugaise, the' Portuguese little boat' (Russian: португальский кораблик), the' monk's hat jellyfish' (Chinese: 僧 帽 水母; pinyin: sēngmào shuǐmǔ), or the' skipjack's eboshi - hat' (katsuo no eboshi (Japanese: 鰹 の 烏帽子)). </P> <P> The Atlantic Portuguese man o' war lives at the surface of the ocean . The gas - filled bladder, or pneumatophore, remains at the surface, while the remainder is submerged . As the Portuguese man o' war has no means of propulsion, it moves according to the winds, currents, and tides . Although it is most commonly found in the open ocean in tropical and subtropical regions, it has been found as far north as the Bay of Fundy, Cape Breton and the Hebrides . </P>

How did the portuguese man of war get its name
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