<Tr> <Th_colspan="2"> Binomial name </Th> </Tr> <Tr> <Td_colspan="2"> Physalia physalis (Linnaeus, 1758) </Td> </Tr> <P> The Atlantic Portuguese man o' war (Physalia physalis), also known as the man - of - war, is a marine hydrozoan of the family Physaliidae found in the Atlantic, Indian and Pacific Oceans . Its venomous long tentacles deliver a painful sting, which is venomous and powerful enough to kill fish or (rarely) humans . Despite its appearance, the Portuguese man o' war is not a true jellyfish but a siphonophore, which is not actually a single multicellular organism (true jellyfish are single organisms), 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 cannot 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>

How deadly is a portuguese man of war