Caption: Portuguese Man-o-War (Physalia utriculus). Despite its jellyfish appearance the Man-o-War is not a true jellyfish but a siphonophore. It differs from a true jellyfish in that it is not actually a single creature, but a colonial organism (hydrozoan) made up of many minute individuals called zooids. It lives near the ocean surface and floats with a sail-like bladder. It commonly occurs in the Pacific Ocean and is often seen in warmer waters around the Hawaiian Islands and Australia. Physalia utriculus feeds on small fish and other small marine plankton such as copepods and shrimp. They surround their prey with their tentacles that contain stinging cells called nematocysts. The nematocysts eject a long tubule (with barbed hooks) into the prey simultaneously releasing a poison (venom) that paralyzes it before being consumed. Its larger relative, Physalia physalis, can have a body size up to 2 feet and tentacles over 150 feet long.
Type: Nature
Copyright 2007 Dennis Kunkel Microscopy, Inc.
Keywords: Cnidaria,Portuguese man o war,Portuguese man-o-war,Portuguese manOwar,cnidarian,jelly fish,jellyfish,980812-02,jelly fish venom,jellyfish venom,toxic jelly fish,toxic jellyfish,jelly fish sting,jelly fish toxin,jellyfish sting,jellyfish toxin,stinging jelly fish,stinging jellyfish,Pysalia,Pacific Ocean jelly fish,Pacific Ocean jellyfish,Pacific jelly fish,Pacific jellyfish,Pysalia utriculus,Physalia,Physalia utriculus,blue bottle jelly fish,blue bottle jellyfish,Pacific Ocean,blue bottles,bluebottle jelly fish,bluebottle jellyfish,bluebottles,jelly fish poison,jellyfish poison,invertebrate,invertebrates,misc. invertebrates,nature,nematocyst,nematocysts,stinging cell,stinging cells,coelenterate,coelenterates,marine,marine organism,ocean organism,salt water,salt water organism,saltwater,saltwater organism,sea water,seawater,Hydrozoa,Physaliidae,Siphonophora,siphonophore,siphonophores,zooid,zooids,Man o War,Man o' War,Man-o-War,venom,venomous tentacle,venomous tentacles,Physalia physalis,colonial organism,colony,Portuguese man of war,marine plankton,ocean plankton,plankton,planktonic,salt water plankton,saltwater plankton,sea water plankton,seawater plankton,surface plankton,blue bottle siphonophore,blue bottle siphonophores,bluebottle,bluebottle siphonophore,bluebottle siphonophores,marine biology,hydrozoan,hydrozoan animal,06.01.12
Market price: $0.01